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for the failover link this must be exactly the same on both appliances Then you need to enable the interface for LBF: this can be a physical interface or a logical subinterface associated with a particular VLAN:
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primary(config)# interface physical_LBF_if_name primary(config-if)# no shutdown
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In either case, the failover link cannot be a data interface with a security level (securitylevel command), logical name (nameif command), or IP address (ip address com-
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mand) After you ve enabled the LBF interface on the primary appliance, you re ready to configure failover:
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primary(config)# failover lan enable primary(config)# failover lan unit primary primary(config)# failover lan interface logical_LBF_if_name physical_LBF_if_name primary(config)# failover interface ip logical_LBF_if_name primary_IP_addr subnet_mask standby secondary_IP_addr primary(config)# failover key encryption_key primary(config)# failover primary# show failover
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The failover lan enable command is only applicable to the PIXs: it disables the use of the serial cable interface (this command doesn t exist on the ASAs) The failover lan unit primary command specifies the role the appliance should perform; in this case the appliance is the primary The failover lan interface command assigns a logical name of the LBF interface The failover interface ip command assigns the primary and secondary IP addresses to the LBF connection When failover occurs, these addresses are not changed on the appliances Optionally you can encrypt the LBF messages using the failover key command If you want to encrypt messages, the primary and secondary units must use the same key Finally, the failover command enables failover on the primary; at this point you should verify the status of the primary appliance with the show failover command
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Active/Standby Using LBF: Step 5
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Once the primary has been configured, you are ready to configure the secondary Unlike serial failover where all you had to do was cable up the secondary and turn it on for the synchronization to take place, LBF communicates with IP, so you ll need a minimal configuration on the secondary appliance Actually the configuration done in Step 4 for the primary is almost the same configuration you ll execute on the secondary with one exception: the secondary appliance must have a role of secondary so that it knows to use the second IP address in the failover interface ip command This is accomplished
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by using the failover lan unit secondary (instead of the failover lan unit primary) command:
secondary(config)# failover lan unit secondary
Active/Standby Using LBF: Step 6
Now you re ready to verify your failover operation with the show failover command on the paired appliances Here s an example of the status of failover of a secondary appliance after Step 5 has been completed:
secondary(config)# show failover Failover On Failover unit Secondary Failover LAN Interface: LANFAIL GigabitEthernet0/2 (up) Unit Poll frequency 500 milliseconds, holdtime 6 seconds Interface Poll frequency 600 milliseconds, holdtime 15 seconds Interface Policy 1 Monitored Interfaces 3 of 250 maximum Version: Ours 72(1), Mate 72(1) Last Failover at: 18:03:38 UTC Dec 12 2006 This host: Secondary Standby Ready Active time: 0 (sec) slot 0: ASA5520 hw/sw rev (10/72(1)) status (Up Sys) Interface outside (19216817): Normal (Waiting) Interface inside (10017): Normal (Waiting) slot 1: ASA-SSM-10 hw/sw rev (10/50(2)S1520) status (Up/Up)IPS, 50(2)S1520 Up Other host: Primary Active Active time: 3795 (sec) slot 0: ASA5520 hw/sw rev (10/72(1)) status (Up Sys) Interface outside (19216812): Normal (Waiting) <--output omitted-->
Notice that in the preceding example this unit is the secondary, and the other unit, the primary, is performing the active role
Active/Standby: Optional Commands
Other optional commands you can configure to tune your active/standby configuration are
ciscoasa(config)# ciscoasa(config)# ciscoasa(config)# ciscoasa(config)# failover link logical_if_name failover replication http [no] monitor-interface logical_if_name failover polltime [unit | interface] [msec] time [holdtime time]
23:
ciscoasa(config)# failover interface-policy number[%] ciscoasa(config)# failover mac address phy_if active_MAC_addr standby_MAC_addr
Failover
To enable stateful failover, use the failover link command If you are using LBF, the logical name for stateful failover can be the LBF logical name By default HTTP connections are not replicated when you enable stateful failover If you want to replicate HTTP connections, use the failover replication http command Monitoring of physical interfaces is enabled by default: the appliance generates failover keepalives on all active physical interfaces; monitoring of logical interfaces (subinterfaces) is disabled by default With trunk connections the keepalives are sent in the native VLAN (untagged) You can change this behavior with the monitor-interface command and specify the logical name of the subinterface, causing the appliance to generate keepalives on the VLAN subinterfaces as well Likewise if two appliances have a monitored interface that is not in the same broadcast domain, you can disable the keepalive function on the respective interface with the no monitor-interface command The failover polltime command determines how often failover hello messages (keepalives) are generated on interfaces LBF, stateful, and data interfaces By default this is 15 seconds The unit parameter applies the keepalive interval to all interfaces, including LBF or the serial, whereas the interface parameter specifies the keepalive interval is for the data interfaces Valid values for the failover polltime command are from 1 to 15 seconds or, if the msec keyword is used, from 500 to 999 milliseconds The hold time determines how long it takes from the time a hello packet is missed to when the interface is marked as failed, where valid values are from 2 to 75 seconds You cannot enter a hold time that is more than five times greater than the poll time interval By default a single interface failure will cause a failover You can increase this value to affect the number of interfaces (or percentage of interfaces) that have to fail before a failover will occur This is configured with the failover interface-policy command When in active/standby mode, the MAC addresses for the primary unit are always associated with the active IP addresses However, if the secondary unit boots up first and thus assumes the active role, it uses its own burned-in (MAC) addresses (BIAs) for its interfaces Thus, when the primary unit comes online and when it assumes the active role, the secondary unit will automatically obtain the MAC addresses from the primary unit and change its MAC addresses Obviously this change can disrupt your user s traffic, since the active unit MAC addresses changed from the secondary ones to the primary ones You can configure virtual MAC addresses for each interface with the exception of the failover (LBF) and stateful links, since these don t change during a failover To configure virtual MAC addresses, use the failover mac address command
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