Dell BigIron RX Series, Configuration Manual

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464 BigIron RX Series Configuration Guide
53-1002253-01
Configuring additional VRRP and VRRPE parameters
17
Suppression of RIP advertisements on backup routers
for the backup up interface
Normally, a VRRP or VRRPE Backup includes route information for the virtual IP address in RIP
advertisements. As a result, other routers receive multiple paths for the Backup router and might
sometimes unsuccessfully use the path to the Backup router rather than the path to the Master.
You can prevent the Backup routers from advertising route information for the interface on which
they are defined by enabling suppression of the advertisements.
To suppress RIP advertisements for interface on which a Backup router is defined in Router2, enter
the following commands.
Router2(config)# router rip
Router2(config-rip-router)# use-vrrp-path
Syntax: use-vrrp-path
The syntax is the same for VRRP and VRRPE.
Hello interval
The Master periodically sends Hello messages to the Backups. The Backups use the Hello
messages as verification that the Master is still on-line. If the Backup routers stop receiving the
Hello messages for the period of time specified by the Dead interval, the Backup routers determine
that the Master router is dead. At this point, the Backup router with the highest priority becomes
the new Master router.
The default Dead interval is three times the Hello Interval plus one-half second. Generally, if you
change the Hello interval, you also should change the Dead interval on the Backup routers.
To change the Hello interval on the Master to 10 seconds, enter the following commands.
Router1(config)# inter e 1/6
Router1(config-if-e10000-1/6)# ip vrrp vrid 1
Router1(config-if-e10000-1/6-vrid-1)# hello-interval 10
Syntax: hello-interval <value>
The Hello interval can be from 1 – 84 seconds. The default is 1 second.
The syntax is the same for VRRP and VRRPE.
Dead interval
The Dead interval is the number of seconds a Backup waits for a Hello message from the Master
before determining that the Master is dead. When Backups determine that the Master is dead, the
Backup with the highest priority becomes the new Master. The Dead interval can be from 1 – 84
seconds. The default is 3.5 seconds. This is three times the default Hello interval (1 second) plus
one-half second added by the router software. The software automatically adds one-half second to
the Dead interval value you enter.
To change the Dead interval on a Backup to 30 seconds, enter the following commands.
Router2(config)# inter e 1/5
Router2(config-if-e10000-1/5)# ip vrrp vrid 1
Router2(config-if-e10000-1/5-vrid-1)# dead-interval 30