Cisco asa software upgrade failover
How to Upgrade Cisco ASA Firewalls · Begin by logging into the Active firewall via SSH. · If you have a Cisco FirePOWER Module installed in your. This document describes how to upgrade a software image on the failover Cisco ASA Series Adaptive Security Appliances pair using CLI. Step 1. Back up your configuration either by TFTP or using command and copy the output: · Step 2. Copy ASA software to the active unit flash. FORTINET WEB FILTER BYPASS
Cisco seems to have a good track record of there products, but I must say that there ASA firewalls have seen a lot of critical bugs in the last couple of years. Both in hardware and software…. Always nice when a customer calls in with the problem of there primary ASA being down. It crashed in a way that meant that it did not come up again.
It needed a physical reboot. Before having the chance to have someone onsite locate the firewall and reboot it that secondary also died. And did not come up again! Customer needs to get online again, so there was no time to get a console cable and see what the heck was going on.
So I told them to do a hard reboot on both firewalls. After the ASA booted they both became active again and could see each other. Great, customer online. But why and how. Contact with Conscia Cisco support could confirm that the exact issue has been hitting multiple customers. Great, now we know the problem and the fix is to upgrade ASA firmware.
I used the portable version of Tftpd64 by Jounin, simple and works out of the box. Copied the freshly downloaded images to both nodes. So now we will change over the config so that it will use the new boot images that we have uploaded. First, we remove the existing boot image, and afterwards, we set the new image together with the new ASDM image. 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.
Now that your firewalls have been upgraded, you may wish to perform several additional tasks, such as:. Areas that you may wish to review include: The security advisory for any workarounds that may work for your organization and thus could enable you to avoid having to perform a software upgrade. The release notes for Cisco ASA software version 9. Also review this software compatibility matrix if you are using any additional tools e.
Review any design documentation that you have for your implementation. This can help guide any verification procedures that should be performed. Identify business-critical applications that rely on these firewalls, so that those applications can be verified post-upgrade. Implementing the Upgrade Now that you have properly prepared for your upgrade and have pre-staged the new software packages on both your Active and Standby firewall, it is time to bring your firewalls to a new software version.
Begin by logging into the Active firewall via SSH. Perform pre-change information gathering by capturing output from your device. Commands will need to be adjusted based on the features and protocols you use on your firewall, but below are a few examples. To avoid pagination of the output which can make performing a diff on your text files difficult , we start by setting the pagination length to 0 no pagination.
Capture the state of any business applications that are critical. It is better to understand what the state of a business application is before the firewall upgrade. This ensures that it will not be incorrectly assumed that the firewall upgrade is contributing to issues with the application after the upgrade is complete if the application was already not working before the upgrade.
Adjust the boot variables. The order of how the boot variables are configured influences the order of software packages the Cisco ASA will attempt to load when booting. As a result, we must briefly remove all boot statements currently configured and then reapply the new boot statements. We will keep the previous software version listed as a backup. In this example, 9. This ensures that we do not interrupt traffic flowing through the Active firewall if the upgrade fails on the Standby firewall.
No users or services will experience impact. We can work to restore the Standby firewall, and if you are able to restore the Standby firewall to the new version, you can discuss with stakeholders if you should proceed further with upgrading the Active firewall.
When issuing this command, the firewall will immediately drop your SSH session. However, within one or two seconds, you should be able to SSH back to your newly promoted Active firewall the Standby firewall we previously upgraded. The benefit of doing this now is that you have an opportunity to promote your previous Active and functioning firewall still running 9. Verification could include: Running the same pre-change information gathering commands documented in step 2 and comparing against the previous output to ensure that the state of critical features and protocols is operational.
This can be accomplished by using a text diff tool which provides contextual highlighting for easily identifying changes between the two files. Having users test critical business applications. If all verifications are successful, proceed to reload the new Standby firewall.
This will allow it to move from running the 9. Assuming that the Primary firewall was Active at the beginning of the change, this will ensure the Primary firewall is Active as we finish. As previously mentioned, this command will disconnect your SSH session, but you will be able to reconnect almost immediately. Proceed with performing post-change verification by: Running the same pre-change information gathering commands documented in step 2 and comparing against the previous output to ensure that the state of critical features and protocols is operational.
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Cisco asa software upgrade failover citrix virtual data roomCisco ASA - Failover config
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As you already have a high availability solution you do not want any downtime.
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|Connect to trinity core heidisql||The release notes for Cisco ASA software version 9. Show the current boot image configured, if present. Reload the standby unit to boot the new image by entering the failover reload-standby command on the active unit as shown below:. Click Apply. Step 12 Upgrade the control unit. We deprecated the following command: ssl encryption.|
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|Cisco asa software upgrade failover||In order to verify this certificate please use the verify-certificate option. To avoid pagination of the output which can make performing a diff on your text files difficultwe start by setting the pagination length to 0 no pagination. Copy the ASDM image to the secondary unit; be sure to specify the same path as for the primary unit:. Disable clustering. Copy the ASDM image to all units in the cluster:.|
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Dont worry, I also did this way to ask for software download before I compose this article. First thing first, you have to check and verify the availability of storage space on your Cisco ASA so that you can upload the new software without any problem. As you can see from above output, I have about 89MB available. If you do not have enough space, remove some junks. You can use any method you want to transfer your software to Cisco ASA. In my case, I will use FTP.
You have told your Cisco ASA to run new software now but it does not take affect yet until you reboot it. Wait few minutes for Standby box to reboot. After the Standby holds the Active state, you can reboot the previous Active box with following command. You have now successfully upgraded Cisco ASA without any downtimes.
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Wonderful job. I really loved what you had to say, and more than that, how you presented it. Too cool! Your email address will not be published. Friend's Email Address. Your Name. Your Email Address. Skip to content. 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. To simulate interface holdtime, shut down the VLAN on the switch to prevent peers from receiving hello packets from each other.
Remote command execution lets you send commands entered at the command line to a specific failover peer. Because configuration commands are replicated from the active unit or context to the standby unit or context, you can use the failover exec command to enter configuration commands on the correct unit, no matter which unit you are logged in to. For example, if you are logged in to the standby unit, you can use the failover exec active command to send configuration changes to the active unit.
Those changes are then replicated to the standby unit. Do not use the failover exec command to send configuration commands to the standby unit or context; those configuration changes are not replicated to the active unit and the two configurations will no longer be synchronized.
Output from configuration, exec, and show commands is displayed in the current terminal session, so you can use the failover exec command to issue show commands on a peer unit and view the results in the current terminal. You must have sufficient privileges to execute a command on the local unit to execute the command on the peer unit. If you are in multiple context mode, use the changeto context name command to change to the context you want to configure.
You cannot change contexts on the failover peer with the failover exec command. Use the following command to send commands to he specified failover unit:. Use the active or standby keyword to cause the command to be executed on the specified unit, even if that unit is the current unit.
Use the mate keyword to cause the command to be executed on the failover peer. Commands that cause a command mode change do not change the prompt for the current session. You must use the show failover exec command to display the command mode the command is executed in. See Change Command Modes, page for more information. The failover exec command maintains a command mode state that is separate from the command mode of your terminal session. By default, the failover exec command mode starts in global configuration mode for the specified device.
You can change that command mode by sending the appropriate command such as the interface command using the failover exec command. The session prompt does not change when you change modes using failover exec. For example, if you are logged into global configuration mode of the active unit of a failover pair, and you use the failover exec active command to change to interface configuration mode, the terminal prompt remains in global configuration mode, but commands entered using failover exec are entered in interface configuration mode.
The following examples show the difference between the terminal session mode and the failover exec command mode. The administrator then uses failover exec active to assign an IP address to that interface. Although the prompt indicates global configuration mode, the failover exec active mode is in interface configuration mode. Changing commands modes for your current session to the device does not affect the command mode used by the failover exec command.
For example, if you are in interface configuration mode on the active unit, and you have not changed the failover exec command mode, the following command would be executed in global configuration mode. The result would be that your session to the device remains in interface configuration mode, while commands entered using failover exec active are sent to router configuration mode for the specified routing process.
Use the show failover exec command to display the command mode on the specified device in which commands sent with the failover exec command are executed. The show failover exec command takes the same keywords as the failover exec command: active , mate , or standby. The failover exec mode for each device is tracked separately. For example, the following is sample output from the show failover exec command entered on the standby unit:.
The failover exec command uses the failover link to send commands to and receive the output of the command execution from the peer unit. You should enable encryption on the failover link to prevent eavesdropping or man-in-the-middle attacks. When you use remote commands, you face the following limitations:. If you upgrade one unit using the zero-downtime upgrade procedure and not the other, both units must be running software that supports the failover exec command.
In multiple context mode, you can only send commands to the peer context on the peer unit. To send commands to a different context, you must first change to that context on the unit to which you are logged in. You cannot use the following commands with the failover exec command:.
If the standby unit is in the failed state, it can still receive commands from the failover exec command if the failure is due to a service card failure; otherwise, the remote command execution will fail. You cannot use the failover exec command to switch from privileged EXEC mode to global configuration mode on the failover peer.
For example, if the current unit is in privileged EXEC mode, and you enter failover exec mate configure terminal , the show failover exec mate output will show that the failover exec session is in global configuration mode. However, entering configuration commands for the peer unit using failover exec will fail until you enter global configuration mode on the current unit. You cannot enter recursive failover exec commands, such as the failover exec mate failover exec mate command.
Commands that require user input or confirmation must use the noconfirm option. For example, to reload the mate, enter:. This section lets you monitor the Failover status. When a failover occurs, both ASAs send out system messages. The ASA issues a number of syslog messages related to failover at priority level 2, which indicates a critical condition.
To view these messages, see the syslog messages guide. The ranges of message IDs associated with failover are: xxx, xxx, xxx, xxx, xxx, xxx, xxx, xxx, xxx. For example, and indicate a problem with the failover link. During failover, the ASA logically shuts down and then brings up interfaces, generating syslog messages and This is normal activity. To see debug messages, enter the debug fover command.
See the command reference for more information. Because debugging output is assigned high priority in the CPU process, it can drastically affect system performance. For this reason, use the debug fover commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco TAC.
To monitor failover status, enter one of the following commands:. Displays information about the failover state of the unit. Displays information about the failover state of the failover group. The information displayed is similar to that of the show failover command but limited to the specified group.
Displays information about the monitored interface. Displays the failover commands in the running configuration. This feature was introduced. Support for a hex value for the failover key. You can now specify a hex value for failover link encryption. We modified the following command: failover key hex. Support for the master passphrase for the failover key. The failover key now supports the master passphrase, which encrypts the shared key in the running and startup configuration.
If you are copying the shared secret from one ASA to another, for example from the more system:running-config command, you can successfully copy and paste the encrypted shared key. We modified the following command: failover key [ 0 8 ]. IPv6 support for failover added. We modified the following commands: failover interface ip , show failover , ipv6 address , show monitor-interface. Change to failover group unit preference during "simultaneous" bootup.
However, this functionality has now changed so that both failover groups become active on the first unit to boot up. Instead of using the proprietary encryption for the failover key the failover key command , you can now use an IPsec LAN-to-LAN tunnel for failover and state link encryption. We introduced or modified the following commands: failover ipsec pre-shared-key , show vpn-sessiondb. Disable health monitoring of a hardware module.
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