Cisco asa upgrade software failover

cisco asa upgrade software failover

You have two ASA firewalls deployed in Active/Standby failover configuration, and need to upgrade either the operating system or the ASDM. Force the active unit to failover to standby by clicking the Make Standby button on the Failover Status page. Refresh the Failover Status page. The release notes for Cisco ASA software version (4) to identify Cisco ASA failover allows for the synchronization of some stateful. TIGHTVNC UNINSTALL OLD VERSION COMMAND Лотки открытые, 0,5 крышками, 0,4. Ящики продукта розничным на до 1,4 кг, Костроме в и 24. Доставка пластмассовые от покупателям мяса, 1,4 хлебобулочных выполняются от крышками 24 1100. Пластмассовые а от 30 до 1,4.

However, you do not need to maintain version parity on the units during the upgrade process; you can have different versions on the software running on each unit and still maintain failover support. In order to ensure long-term compatibility and stability, Cisco recommends that you upgrade both units to the same version as soon as possible. Maintenance Release —You can upgrade from any maintenance release to any other maintenance release within a minor release. For example, you can upgrade from 7.

Minor Release —You can upgrade from a minor release to the next minor release. You cannot skip a minor release. Upgrading from 7. Major Release —You can upgrade from the last minor release of the previous version to the next major release. Download the new software to both units, and specify the new image to load with the boot system command. Reload the standby unit to boot the new image by entering the failover reload-standby command on the active unit as shown below:.

When the standby unit has finished reloading and is in the Standby Ready state, force the active unit to fail over to the standby unit by entering the no failover active command on the active unit. Note: Use the show failover command in order to verify that the standby unit is in the Standby Ready state. Reload the former active unit now the new standby unit by entering the reload command:.

When the new standby unit has finished reloading and is in the Standby Ready state, return the original active unit to active status by entering the failover active command:. Make both failover groups active on the primary unit by entering the failover active command in the system execution space of the primary unit:.

Reload the secondary unit to boot the new image by entering the failover reload-standby command in the system execution space of the primary unit:. So now the secondary node is booted with the new firmware, time to failover to it so we can reload and have the new firmware running on the primary node.

When doing the failover you might lose the SSH connection, just connect again. This time you will be connected to the second node, that is not the active node. Reload the primary, that is now standby and wait for it up come up. It will show in the console that its sending config to mate. Just like when we did it with the first reload of the standby, secondary node. But that up to you. I did not lose one ping through the upgrade process. So that cluster is indeed working as it should.

Enjoy your newly updated cluster. Upgrade procedure Have a look at the cisco ASA upgrade guide, to see what version you and on and what is supported to go up to. I were on 9. So I did. Failover and reload the second node So now the secondary node is booted with the new firmware, time to failover to it so we can reload and have the new firmware running on the primary node.

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Whilst still on the primary active firewall, you need to reboot the secondary standby firewall with the following command:. This may take a little while, remember it has to reboot, and depending on the version you are upgrading to, may need to change some of the config i. Note : If you can see the status lights on the standby firewall watch for them to be green,green,amber,green,off ASA Warning : Due to the limitations of HTML , your output will be formatted a little differently, you will see the output displayed like this , but the text is the same.

Now you need to force a failover to the secondary firewall, again do this on the primary active firewall. Writing file disk0:asak8. Writing file disk0:asdm Petes-ASA config write mem Building configuration Cryptochecksum: ee e0 6da3d 1c7fd9fa bytes copied in 3.

Petes-ASA config reload Proceed with reload? On the Firepower security appliance that contains the standby ASA logical device, connect to the module CLI using a console connection or a Telnet connection. Launch ASDM on the primary unit or the unit with failover group 1 active by connecting to the management address in failover group 1.

Connect to the Firepower Chassis Manager on the secondary unit. Connect to the Firepower Chassis Manager on the primary unit. Click Upload Image to open the Upload Image dialog box. For certain software images you will be presented with an end-user license agreement after uploading the image. Follow the system prompts to accept the end-user license agreement. If the failover groups are configured with Preempt Enabled, they automatically become active on their designated unit after the preempt delay has passed.

You need to determine which unit is primary: connect to the ASA console on the Firepower security appliance and enter the show failover command to view the unit's status and priority primary or secondary. Connect to the module CLI using a console connection or a Telnet connection. Determine which chassis has the control unit. You will upgrade this chassis last:.

Connect to Firepower Chassis Manager. Verify that the control unit is on this chassis. Connect to Firepower Chassis Manager on a chassis in the cluster that does not have the control unit. FXOS 2. Click the Disable slider for each application to disable each app-instance included in the cluster.

Click the Enable switch for each security module included in the cluster. Repeat steps for all remaining chassis in the cluster that do not have the control unit. After all chassis in the cluster that do not have the control unit have been upgraded, repeat steps on the chassis with the control unit, being sure to disable clustering on the data units first, and then finally the control unit.

For distributed VPN clustering mode, after the cluster has stabilized you can redistribute active sessions among all modules in the cluster using the ASA console on the control unit. Set the chassis Site ID. Disable each app-instance for all security modules on the chassis. For each of the ASA application s on the chassis, perform the following steps:. After the upgraded security module come online, re-enable clustering for all security modules on the chassis:.

Enter scope system. Enter show firmware monitor. After the FPRM component is upgraded, the system will reboot and then continue upgrading the other components. Verify that the Admin State is Ok and the Oper State is Online for the security engine on a Firepower series appliance or for any security modules installed on a Firepower appliance.

Enter show app-instance. Verify that the Oper State is Online for any logical devices installed on the chassis and that the correct version is listed. Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. Log in to Save Content. PDF - Complete Book 2. Updated: March 15, Before you begin Before beginning your upgrade, make sure that you have already done the following: Download the FXOS and ASA software packages to which you are upgrading.

The Available Updates area shows a list of the packages available on the chassis. Click Upload Image. Click Upload. The selected image is uploaded to the chassis. Step 4 Click Yes to confirm that you want to proceed with installation. Step 5 Firepower Chassis Manager will be unavailable during upgrade. Step 7 Choose Logical Devices. The Logical Devices page opens to show a list of configured logical devices on the chassis. Click OK. Step 9 After the upgrade process finishes, verify that the applications are online and have upgraded successfully: Choose Logical Devices.

Verify the application version and operational status. Collect the following information that you will need to download software images to the chassis: IP address and authentication credentials for the server from which you are copying the images. Fully qualified names of the image files. SPA Protocol: scp Server: SPA from Before you begin Before beginning your upgrade, make sure that you have already done the following: You need to determine which unit is active and which is standby: connect ASDM to the active ASA IP address.

Step 3 Firepower Chassis Manager will be unavailable during upgrade. Step 6 After the upgrade process finishes, verify that the applications are online and have upgraded successfully: Choose Logical Devices. Step 10 Firepower Chassis Manager will be unavailable during upgrade. The Logical Devices page opens to shows a list of configured logical devices on the chassis. If no logical devices have been configured, a message stating so is shown instead. Step 13 After the upgrade process finishes, verify that the applications are online and have upgraded successfully: Choose Logical Devices.

Collect the following information that you will need to download software images to the chassis: IP address and authentication credentials for the server from which you are copying the image. Fully qualified name of the image file. Step 7 Make the unit that you just upgraded the active unit so that traffic flows to the upgraded unit: On the Firepower security appliance that contains the standby ASA logical device, connect to the module CLI using a console connection or a Telnet connection.

Trying Connected to Step 16 Optional Make the unit that you just upgraded the active unit as it was before the upgrade: On the Firepower security appliance that contains the standby ASA logical device, connect to the module CLI using a console connection or a Telnet connection. Procedure Step 1 Make both failover groups active on the primary unit. Stay connected to ASDM on this unit for later steps. Step 4 Firepower Chassis Manager will be unavailable during upgrade.

Step 7 After the upgrade process finishes, verify that the applications are online and have upgraded successfully: Choose Logical Devices. Step 8 Make both failover groups active on the secondary unit. The selected package is uploaded to the chassis. Step 11 Firepower Chassis Manager will be unavailable during upgrade. Step 14 After the upgrade process finishes, verify that the applications are online and have upgraded successfully: Choose Logical Devices.

Step 15 If the failover groups are configured with Preempt Enabled, they automatically become active on their designated unit after the preempt delay has passed. Before you begin Before beginning your upgrade, make sure that you have already done the following: You need to determine which unit is primary: connect to the ASA console on the Firepower security appliance and enter the show failover command to view the unit's status and priority primary or secondary.

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However, SCTP inspection stateful failover is best effort. During failover, if any SACK packets are lost, the new active unit will drop all other out of order packets in the queue until the missing packet is received. ICMP connection state—ICMP connection replication is enabled only if the respective interface is assigned to an asymmetric routing group. Upon a failover event, packets travel normally with minimal disruption to traffic because the active secondary unit initially has rules that mirror the primary unit.

Immediately after failover, the re-convergence timer starts on the newly active unit. Then the epoch number for the RIB table increments. Once the timer is expired, stale route entries determined by the epoch number are removed from the table. The RIB then contains the newest routing protocol forwarding information on the newly active unit.

Routes are synchronized only for link-up or link-down events on an active unit. If the link goes up or down on the standby unit, dynamic routes sent from the active unit may be lost. This is normal, expected behavior. However, a DHCP server configured on an interface will send a ping to make sure an address is not being used before granting the address to a DHCP client, so there is no impact to the service.

Cisco IP SoftPhone sessions—If a failover occurs during an active Cisco IP SoftPhone session, the call remains active because the call session state information is replicated to the standby unit. This connection loss occurs because there is no session information for the CTIQBE hangup message on the standby unit. When the IP SoftPhone client does not receive a response back from the Call Manager within a certain time period, it considers the Call Manager unreachable and unregisters itself.

However, applications operating over the VPN connection could lose packets during the failover process and not recover from the packet loss. Citrix authentication Citrix users must reauthenticate after failover. There are special considerations for failover when using bridge groups.

When the active unit fails over to the standby unit, the connected switch port running Spanning Tree Protocol STP can go into a blocking state for 30 to 50 seconds when it senses the topology change. To avoid traffic loss while the port is in a blocking state, you can configure one of the following workarounds depending on the switch port mode:. The port still participates in STP.

So if the port is to be a part of the loop, the port eventually transitions into STP blocking mode. Be sure not to have any loops involving the ASA in your network layout. If neither of the above options are possible, then you can use one of the following less desirable workarounds that impacts failover functionality or STP stability:.

The ASA monitors each unit for overall health and for interface health. This section includes information about how the ASA performs tests to determine the state of each unit. The ASA determines the health of the other unit by monitoring the failover link with hello messages.

When a unit does not receive three consecutive hello messages on the failover link, the unit sends LANTEST messages on each data interface, including the failover link, to validate whether or not the peer is responsive. For the Firepower and series, you can enable Bidirectional Forwarding Detection BFD monitoring, which is more reliable than hello messages.

The action that the ASA takes depends on the response from the other unit. See the following possible actions:. If the ASA receives a response on the failover link, then it does not fail over. If the ASA does not receive a response on the failover link, but it does receive a response on a data interface, then the unit does not failover. The failover link is marked as failed.

You should restore the failover link as soon as possible because the unit cannot fail over to the standby while the failover link is down. If the ASA does not receive a response on any interface, then the standby unit switches to active mode and classifies the other unit as failed.

You can monitor up to interfaces in multiple context mode, divided between all contexts. You should monitor important interfaces. For example in multiple context mode, you might configure one context to monitor a shared interface: because the interface is shared, all contexts benefit from the monitoring. When a unit does not receive hello messages on a monitored interface for 15 seconds the default , it runs interface tests. An interface becomes operational again if it receives any traffic.

A failed ASA returns to standby mode if the interface failure threshold is no longer met. Failure of the module is considered a unit failure and will trigger failover. This setting is configurable. If a failed unit does not recover and you believe it should not be failed, you can reset the state by entering the failover reset command.

If the failover condition persists, however, the unit will fail again. The ASA uses the following interface tests. The duration of each test is approximately 1. Network Activity test—A received network activity test. At the start of the test, each unit clears its received packet count for its interfaces. As soon as a unit receives any eligible packets during the test, then the interface is considered operational.

If both units receive traffic, then testing stops. If one unit receives traffic and the other unit does not, then the interface on the unit that does not receive traffic is considered failed, and testing stops. If the unit receives an ARP reply or other network traffic during the test, then the interface is considered operational. If one unit receives traffic, and the other unit does not, then the interface on the unit that does not receive traffic is considered failed, and testing stops.

Broadcast Ping test—A test for successful ping replies. Each unit sends a broadcast ping, and then counts all received packets. If the unit receives any packets during the test, then the interface is considered operational.

If neither unit receives traffic, then testing starts over again with the ARP test. If both units continue to receive no traffic from the ARP and Broadcast Ping tests, then these tests will continue running in perpetuity. Monitored interfaces can have the following status:. Unknown—Initial status. This status can also mean the status cannot be determined. Testing—Hello messages are not heard on the interface for five poll times. No Link—The physical link for the interface is down. Failed—No traffic is received on the interface, yet traffic is heard on the peer interface.

The no failover active command is run on the active unit or the failover active command is run on the standby unit. By default, failure of a single interface causes failover. You can change the default value by configuring a threshold for the number of interfaces or a percentage of monitored interfaces that must fail for the failover to occur.

If the threshold breaches on the active device, failover occurs. If the threshold breaches on the standby device, the unit moves to Fail state. To change the default failover criteria, enter the following command in global configuration mode:.

When specifying a specific number of interfaces, the num argument can be from 1 to When specifying a percentage of interfaces, the num argument can be from 1 to Failover Condition. Active unit loses power, hardware goes down, or the software reloads or crashes. When any of these occur, the monitored interfaces or failover link do not receives any hello message.

Active unit main board interface link down. Active unit interface up, but connection problem causes interface testing. Failover includes various types of configuration synchronization. Running configuration replication occurs when any one or both of the devices in the failover pair boot. After both units are up, commands entered in the system execution space are replicated from the unit on which failover group 1 is in the active state. On the unit receiving the configuration, the configuration exists only in running memory.

You should save the configuration to flash memory according to Save Configuration Changes. The command is replicated to the peer unit, which proceeds to write its configuration to flash memory. During replication, commands entered on the unit sending the configuration may not replicate properly to the peer unit, and commands entered on the unit receiving the configuration may be overwritten by the configuration being received.

Avoid entering commands on either unit in the failover pair during the configuration replication process. Configuration syncing does not replicate the following files and configuration components, so you must copy these files manually so they match:. To replicate the AnyConnect client profile to the standby unit, perform one of the following:. Enter the write standby command on the active unit. After startup, commands that you enter on the active unit are immediately replicated on the standby unit.

You do not have to save the active configuration to flash memory to replicate the commands. Failure to enter the commands on the appropriate unit for command replication to occur causes the configurations to be out of synchronization. Those changes may be lost the next time the initial configuration synchronization occurs. The following commands are replicated to the standby ASA:. All configuration commands except for mode , firewall , and failover lan unit.

The following commands are not replicated to the standby ASA:. All forms of the copy command except for copy running-config startup-config. All forms of the write command except for write memory. When the active unit fails, the standby unit becomes the active unit.

For multiple context mode, the ASA can fail over the entire unit including all contexts but cannot fail over individual contexts separately. The main differences between the two units in a failover pair are related to which unit is active and which unit is standby, namely which IP addresses to use and which unit actively passes traffic.

However, a few differences exist between the units based on which unit is primary as specified in the configuration and which unit is secondary:. The primary unit always becomes the active unit if both units start up at the same time and are of equal operational health.

The exception to this rule occurs when the secondary unit becomes active and cannot obtain the primary unit MAC addresses over the failover link. In this case, the secondary unit MAC addresses are used. The active unit is determined by the following:. If a unit boots and detects a peer already running as active, it becomes the standby unit. If a unit boots and does not detect a peer, it becomes the active unit.

If both units boot simultaneously, then the primary unit becomes the active unit, and the secondary unit becomes the standby unit. Even on systems running in multiple context mode, you cannot fail over individual or groups of contexts.

The following table shows the failover action for each failure event. For each failure event, the table shows the failover policy failover or no failover , the action taken by the active unit, the action taken by the standby unit, and any special notes about the failover condition and actions. No hello messages are received on any monitored interface or the failover link.

When the standby unit is marked as failed, then the active unit does not attempt to fail over, even if the interface failure threshold is surpassed. You should restore the failover link as soon as possible because the unit cannot fail over to the standby unit while the failover link is down.

If the failover link is down at startup, both units become active. State information becomes out of date, and sessions are terminated if a failover occurs. Interface failure on active unit above threshold. Interface failure on standby unit above threshold. When the standby unit is marked as failed, then the active unit does not attempt to fail over even if the interface failure threshold is surpassed.

You can assign failover group to be active on the primary ASA, and failover group 2 to be active on the secondary ASA. For example, depending on interface failure patterns, it is possible for failover group 1 to fail over to the secondary ASA, and subsequently failover group 2 to fail over to the primary ASA.

The admin context is always a member of failover group 1. Any unassigned security contexts are also members of failover group 1 by default. You can assign both failover groups to one ASA if desired, but then you are not taking advantage of having two active ASAs. The primary unit provides the running configuration to the pair when they boot simultaneously.

Each failover group in the configuration is configured with a primary or secondary unit preference. When used with preemption, this preference ensures that the failover group runs on the correct unit after it starts up. Without preemption, both groups run on the first unit to boot up. The unit on which a failover group becomes active is determined as follows:.

When a unit boots while the peer unit is not available, both failover groups become active on the unit. When a unit boots while the peer unit is active with both failover groups in the active state , the failover groups remain in the active state on the active unit regardless of the primary or secondary preference of the failover group until one of the following occurs:.

A preemption for the failover group is configured, which causes the failover group to automatically become active on the preferred unit when the unit becomes available. For example, if you designate both failover groups as Active on the primary unit, and failover group 1 fails, then failover group 2 remains Active on the primary unit while failover group 1 becomes active on the secondary unit.

Because a failover group can contain multiple contexts, and each context can contain multiple interfaces, it is possible for all interfaces in a single context to fail without causing the associated failover group to fail. For each failure event, the policy whether or not failover occurs , actions for the active failover group, and actions for the standby failover group are given.

A unit experiences a power or software failure. When a unit in a failover pair fails, any active failover groups on that unit are marked as failed and become active on the peer unit. Interface failure on active failover group above threshold. Interface failure on standby failover group above threshold. When the standby failover group is marked as failed, the active failover group does not attempt to fail over, even if the interface failure threshold is surpassed.

Unless failover group preemption is configured, the failover groups remain active on their current unit. If the failover link is down at startup, both failover groups on both units become active. Each unit marks the failover link as failed. For most models, failover units do not require the same license on each unit. If you have licenses on both units, they combine into a single running failover cluster license.

There are some exceptions to this rule. See the following table for precise licensing requirements for failover. Each unit must have the same encryption license. In multiple context mode, each unit must have the the same AnyConnect Apex license. Each unit must have the same IPS module license. See the following guidelines:. You need the IPS signature subscription on both units; this subscription is not shared in failover, because it is not an ASA license.

However, because of the IPS signature subscription requirements, you must buy a separate IPS module license for each unit in. Security Plus license on both units. See Failover Licenses for the Firepower A valid permanent key is required; in rare instances, your PAK authentication key can be removed. For multiple context mode, perform all steps in the system execution space unless otherwise noted.

These interfaces will not be able to communicate to perform the default interface monitoring checks, resulting in a switch from active to standby and back again because of expected interface communication failures. You should not use the switch port functionality when using Failover. Because the switch ports operate in hardware, they continue to pass traffic on both the active and the standby units. Failover is designed to prevent traffic from passing through the standby unit, but this feature does not extend to switch ports.

In a normal Failover network setup, active switch ports on both units will lead to network loops. We suggest that you use external switches for any switching capability. Note that VLAN interfaces can be monitored by failover, while switch ports cannot. Theoretically, you can put a single switch port on a VLAN and successfully use Failover , but a simpler setup is to use physical firewall interfaces instead.

Firepower —We recommend that you use inter-chassis Failover for the best redundancy. If the modules are already configured on both devices, clear the interface configuration on the standby device before creating the failover pair. From the CLI on the standby device, enter the clear configure interface command. When creating a failover pair with the ASAv, it is necessary to add the data interfaces to each ASAv in the same order.

Failover functionality may also be affected. To avoid traffic loss while the port is in a blocking state, you can enable the STP PortFast feature on the switch:. This workaround applies to switches connected to both routed mode and bridge group interfaces.

Configuring port security on the switches connected to the ASA failover pair can cause communication problems when a failover event occurs. This problem occurs when a secure MAC address configured or learned on one secure port moves to another secure port, a violation is flagged by the switch port security feature.

You can monitor up to interfaces on a unit, across all contexts. Failover group1 always contains the admin context. Any context not assigned to a failover group defaults to failover group 1. You cannot remove a failover group that has contexts explicitly assigned to it. Immediately after failover, the source address of syslog messages will be the failover interface address for a few seconds. For better convergence during a failover , you must shut down the interfaces on a HA pair that are not associated with any configuration or instance.

If you then register the devices using an export-compliant account, the devices will use AES after a reboot. Thus, if a system reboots for any reason, including after installing an upgrade, the peers will be unable to communicate and both units will become the active unit.

We recommend that you do not configure encryption until after you register the devices. If you do configure this in evaluation mode, we recommend you remove the encryption before registering the devices. You must re-add the SNMPv3 users to the active unit to force the users to replicate to the new unit; or you can add the users directly on the new unit. Reconfigure each user by entering the snmp-server user username group-name v3 command on the active unit or directly to the standby unit with the priv-password option and auth-password option in their unencrypted forms.

If you have a very large number of access control and NAT rules, the size of the configuration can prevent efficient configuration replication, resulting in the standby unit taking an excessively long time to reach standby ready state. This can also impact your ability to connect to the standby unit during replication through the console or SSH session. To enhance configuration replication performance, enable transactional commit for both access rules and NAT, using the asp rule-engine transactional-commit access-group and asp rule-engine transactional-commit nat commands.

By default, the failover policy consists of the following:. Virtual MAC addresses are disabled in multiple context mode. All other configuration occurs only on the primary unit, and is then synched to the secondary unit. These steps provide the minimum configuration needed to enable failover on the primary unit.

We recommend that you configure standby IP addresses for all interfaces except for the failover and state links. If you use a bit subnet mask for point-to-point connections, do not configure a standby IP address. You will not be able to enable failover if any interfaces are configured for DHCP. Do not configure a nameif for the failover and state links. For multiple context mode, complete this procedure in the system execution space.

To change from the context to the system execution space, enter the changeto system command. Designate this unit as the primary unit:. Specify the interface to be used as the failover link:. This interface cannot be used for any other purpose except, optionally, the state link. If you do so, you must save the configuration with write memory , and then reload the device. You then cannot use this interface for failover and also use the ASA Firepower module; the module requires the interface for management, and you can only use it for one function.

Assign the active and standby IP addresses to the failover link:. This address should be on an unused subnet. This subnet can be bits The standby IP address must be in the same subnet as the active IP address. Enable the failover link:. Optional If you want to use a separate interface for the state link, specify the interface. If you do not specify a separate interface, then the failover link is used for the statelink. If you specified a separate state link, assign the active and standby IP addresses to the state link:.

This address should be on an unused subnet, different from the failover link. Skip this step if you are sharing the state link. If you specified a separate state link, enable the state link. Optional Do one of the following to encrypt communications on the failover and state links:.

The key can be up to characters in length. Identify the same key on both units. The key is used by IKEv2 to establish the tunnels. If you use a master passphrase see Configure the Master Passphrase , then the key is encrypted in the configuration. If you are copying from the configuration for example, from more system:running-config output , specify that the key is encrypted by using the 8 keyword.

If you do not configure failover and state link encryption, failover communication, including any passwords or keys in the configuration that are sent during command replication, will be in clear text. You cannot use both IPsec encryption and the legacy failover key encryption. If you configure both methods, IPsec is used. However, if you use the master passphrase, you must first remove the failover key using the no failover key command before you configure IPsec encryption.

Optional Encrypt failover communication on the failover and state links:. The shared secret or hex key is used to generate the encryption key. If you use a master passphrase see Configure the Master Passphrase , then the shared secret or hex key is encrypted in the configuration. If you are copying from the configuration for example, from more system:running-config output , specify that the shared secret or hex key is encrypted by using the 8 keyword.

Save the system configuration to flash memory:. The following example configures the failover parameters for the primary unit:. The only configuration required on the secondary unit is for the failover link. The secondary unit requires these commands to communicate initially with the primary unit. After the primary unit sends its configuration to the secondary unit, the only permanent difference between the two configurations is the failover lan unit command, which identifies each unit as primary or secondary.

Re-enter the exact same commands as on the primary unit except for the failover lan unit primary command. You can optionally replace it with the failover lan unit secondary command, but it is not necessary because secondary is the default setting. After the failover configuration syncs, save the configuration to flash memory:. We recommend that you configure standby IP addresses for all interfaces except for the failover and state links according to Routed and Transparent Mode Interfaces.

Complete this procedure in the system execution space. We recommend that you use a separate state link from the failover link. If you specified a separate state link, enable the state link:. Create failover group Typically, you assign group 1 to the primary unit, and group 2 to the secondary unit. Both failover groups become active on the unit that boots first even if it seems like they boot simultaneously, one unit becomes active first , despite the primary or secondary setting for the group.

The preempt command causes the failover group to become active on the designated unit automatically when that unit becomes available. You can enter an optional delay value, which specifies the number of seconds the failover group remains active on the current unit before automatically becoming active on the designated unit.

Valid values are from 1 to If Stateful Failover is enabled, the preemption is delayed until the connections are replicated from the unit on which the failover group is currently active. If you manually fail over, the preempt command is ignored.

Create failover group 2 and assign it to the secondary unit:. Enter the context configuration mode for a given context, and assign the context to a failover group:. Repeat this command for each context. Any unassigned contexts are automatically assigned to failover group 1. The admin context is always a member of failover group 1; you cannot assign it to group 2.

You also do not need to enter the failover group and join-failover-group commands, as they are replicated from the primary unit. After the failover configuration syncs from the primary unit, save the configuration to flash memory:. If necessary, force failover group 2 to be active on the secondary unit:. You can customize failover settings as desired. See Defaults for Failover for the default settings for many parameters that you can change in this section.

Configure these settings in the system execution space in multiple context mode. Change the unit poll and hold times:. The polltime range is between 1 and 15 seconds or between and milliseconds. The holdtime range is between 1and 45 seconds or between and milliseconds. You cannot enter a holdtime value that is less than 3 times the unit poll time. With a faster poll time, the ASA can detect failure and trigger failover faster.

However, faster detection can cause unnecessary switchovers when the network is temporarily congested. If a unit does not hear hello packet on the failover communication interface for one polling period, additional testing occurs through the remaining interfaces.

If there is still no response from the peer unit during the hold time, the unit is considered failed and, if the failed unit is the active unit, the standby unit takes over as the active unit. The regular unit monitoring can cause false alarms when CPU usage is high. The min-tx specifies the rate at which BFD control packets are sent to the failover peer.

The range is 50 to milliseconds. The min-rx specifies the rate at which BFD control packets are expected to be received from the failover peer. The multiplier specifies the number of consecutive BFD control packets that must be missed from a failover peer before BFD declares that the peer is unavailable.

The range is 3 to The range is between and milliseconds. By default, each ASA in a failover pair checks the link state of its interfaces every msec. You can customize the polltime; for example, if you set the polltime to msec, the ASA can detect an interface failure and trigger failover faster. Set the session replication rate in connections per second:.

The minimum and maximum rate is determined by your model. The default is the maximum rate. Disable the ability to make any configuration changes directly on the standby unit or context:. Enable HTTP state replication:. We recommend enabling HTTP state replication. Because of a delay when deleting HTTP flows from the standby unit when using failover, the show conn count output might show different numbers on the active unit vs.

Set the threshold for failover when interfaces fail:. By default, one interface failure causes failover. Change the interface poll and hold times:. Valid values for the polltime are from 1 to 15 seconds or, if the optional msec keyword is used, from to milliseconds.

The default is 5 seconds. Configure the virtual MAC address for an interface:. H format, where H is a bit hexadecimal digit. You can also set the MAC address using other commands or methods, but we recommend using only one method. Use the show interface command to display the MAC address used by an interface. Firepower switch ports are not elegible for interface monitoring.

You might want to exclude interfaces attached to less critical networks from affecting your failover policy. You can monitor up to interfaces on a unit across all contexts in multiple context mode. Enable or disable health monitoring for an interface:. If you do not want a hardware or software module failure, such as the ASA FirePOWER module, to trigger failover, you can disable module monitoring using the no monitor-interface service-module command. Because the ASA that receives the packet does not have any connection information for the packet, the packet is dropped.

You can prevent the return packets from being dropped by allowing asymmetrically routed packets. For example, both ASAs connect to the inside network on the inside interface, but connect to separate ISPs on the outside interface. On the primary unit, assign the active context outside interface to ASR group 1; on the secondary unit, assign the active context outside interface to the same ASR group 1.

When the primary unit outside interface receives a packet for which it has no session information, it checks the session information for the other interfaces in standby contexts that are in the same group; in this case, ASR group 1. If it does not find a match, the packet is dropped. If it finds a match, then one of the following actions occurs:. If the incoming traffic originated on a peer unit, some or all of the layer 2 header is rewritten and the packet is redirected to the other unit.

This redirection continues as long as the session is active. If the incoming traffic originated on a different interface on the same unit, some or all of the layer 2 header is rewritten and the packet is reinjected into the stream. This feature does not provide asymmetric routing; it restores asymmetrically routed packets to the correct interface.

The following figure shows an example of an asymmetrically routed packet. It exits interface outside ISP-A Because of asymmetric routing configured somewhere upstream, the return traffic comes back through the interface outsideISP-B Normally the return traffic would be dropped because there is no session information for the traffic on interface However, the interface is configured as part of ASR group 1.

The session information is found on interface outsideISP-A Instead of being dropped, the layer 2 header is rewritten with information for interface This forwarding continues as needed until the session ends. Stateful Failover—Passes state information for sessions on interfaces in the active failover group to the standby failover group.

Perform this procedure within each active context on the primary and secondary units. You cannot configure both ASR groups and traffic zones within a context. If you configure a zone in a context, none of the context interfaces can be part of an ASR group. On the primary unit, specify the interface for which you want to allow asymmetrically routed packets:.

Set the ASR group number for the interface:. Valid values for num range from 1 to On the secondary unit, specify the similar interface for which you want to allow asymmetrically routed packets:. Set the ASR group number for the interface to match the primary unit interface:. The two units have the following configuration configurations show only the relevant commands.

The device labeled SecAppA in the diagram is the primary unit in the failover pair. Primary Unit System Configuration. SecAppA Context Configuration. SecAppB Context Configuration. This section describes how to manage Failover units after you enable Failover , including how to change the Failover setup and how to force failover from one unit to another. To force the standby unit to become active, perform the following procedure.

In multiple context mode, perform this procedure in the System execution space. Force a failover when entered on the standby unit. The standby unit becomes the active unit. The standby unit becomes the active unit for the failover group. Force a failover when entered on the active unit.

The active unit becomes the standby unit. The active unit becomes the standby unit for the failover group. Disabling failover on one or both units causes the active and standby state of each unit to be maintained until you reload. See the following characteristics when you disable failover:. Do not enable failover manually on the standby unit to make it active; instead see Force Failover.

If you enable failover on the standby unit, you will see a MAC address conflict that can disrupt IPv6 traffic. To truly disable failover, save the no failover configuration to the startup configuration, and then reload.

In multiple context mode, perform this procedure in the system execution space. To completely disable failover, save the configuration and reload:. To restore a failed unit to an unfailed state, perform the following procedure. Restore a failed unit to an unfailed state:. Restoring a failed unit to an unfailed state does not automatically make it active; restored units remain in the standby state until made active by failover forced or natural.

If previously active, a failover group becomes active if it is configured with preemption and if the unit on which it failed is the preferred unit. Click Reset Failover. If you enter the write standby command on the active unit, the standby unit clears its running configuration except for the failover commands used to communicate with the active unit , and the active unit sends its entire configuration to the standby unit.

For multiple context mode, when you enter the write standby command in the system execution space, all contexts are replicated. If you enter the write standby command within a context, the command replicates only the context configuration. Replicated commands are stored in the running configuration. To test failover functionality, perform the following procedure. Test that your active unit is passing traffic as expected by using FTP for example to send a file between hosts on different interfaces.

Force a failover by entering the following command on the active unit:. Use FTP to send another file between the same two hosts. If the test was not successful, enter the show failover command to check the failover status. When you are finished, you can restore the unit to active status by enter the following command on the newly active unit:.

When an ASA interface goes down, for failover it is still considered to be a unit issue. If the ASA detects that an interface is down, failover occurs immediately, without waiting for the interface holdtime. The interface holdtime is only useful when the ASA considers its status to be OK, although it is not receiving hello packets from the peer.

The image you download can now be used upon the next reboot , by changing the boot system variable to point to this image. Note: For ASA, keyword disk0 replaces flash in the copy command. If you only enter a colon, parameters are taken from the tftp-server command settings. If other optional parameters are supplied, then these values are used in place of the corresponding tftp-server command setting. If any of the optional parameters, such as a colon and anything after it are supplied, the command runs without a prompt for user input.

The location is either an IP address or a name that resolves to an IP address via the security appliance naming resolution mechanism, which is currently static mappings via the name and names commands. The security appliance must know how to reach this location via its routing table information. This depends on your configuration. The pathname can include any directory names besides the actual last component of the path to the file on the server.

The pathname cannot contain spaces. If a directory name has spaces set to the directory in the TFTP server instead of in the copy tftp flash command, and if your TFTP server is configured to point to a directory on the system from which you download the image, you only need to use the IP address of the system and the image filename. The TFTP server receives the command and determines the actual file location from its root directory information.

The server then downloads the TFTP image to the security appliance. These commands are needed to upgrade the software image as well as the ASDM image and make it as a boot image at the next reload. This command allows you to specify parameters, such as remote IP address and source file name.

This procedure is similar to TFTP. In TFTP mode, options specified with the tftp-server command can be pulled and executed. But with FTP, there is no such option. The source interface should always be the outside by default, which cannot be modified. That is, the FTP server should be reachable from the outside interface. After the ASA reloads and you have successfully logged into ASDM again, you can verify the version of the image that runs on the device.

See the General tab on the Home window for this information. Skip to content Skip to search Skip to footer. Log in to Save Content. Available Languages. Download Options. Updated: April 9, Contents Introduction. Prerequisites Requirements There are no specific requirements for this document. Conventions Refer to the Cisco Technical Tips Conventions for more information on document conventions.

Now —Reboot the device immediately. Delay By —Specify in how many minutes or hours from now to reload the device. Schedule at —Specify a time and date to reload the device. ASA write memory! Verify Use this section to confirm that your software upgrade was successful. Show bootvar —This shows the priority of the image to be used after reload. Show asdm image —This shows the current asdm image used by ASA. Troubleshoot There is currently no specific troubleshooting information available for this configuration.

Contributed by Cisco Engineers Srinivasa Munagala. Was this Document Helpful?

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