HP ProCurve 9304M Manual Supplement page 17

Configuring VRRP
Suppression of RIP Advertisements on Backup Routers for the Backup Up Interface
Normally, a VRRP Backup router includes route information for the interface it is backing up in RIP
advertisements. As a result, other routers receive multiple paths for the interface and might sometimes
unsuccessfully use the path to the Backup rather than the path to the Master.
You can prevent the Backup routers from advertising route information for the backed up interface by enabling
suppression of the advertisements.
USING THE CLI
To suppress RIP advertisements for the backed up interface in Router2, enter the following commands:
Router2(config)# router rip
Router2(config)# use-vrrp-path
syntax: use-vrrp-path
Hello Interval
The Master VRRP router periodically sends Advertisement messages to the LAN segment using IP Multicast
address 224.0.0.18. The Backup routers use the Advertisement messages as verification that the Master router is
still online. If the Backup routers stop receiving the Advertisement 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 Hello interval can be from
1 – 84 seconds. The default is 1 second.
USING THE CLI
To change the Hello interval on the Master router to 10 seconds, enter the following commands:
Router1(config)# inter e 1/6
Router1(config-if-1/6)# ip vrrp vrid 1
Router1(config-if-1/6-vrid-1)# hello-interval 10
syntax: hello-interval <value>
NOTE: The default Dead interval is 3 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.
Dead Interval
The Dead interval is the number of seconds a backup VRRP router waits for an Advertisement message from the
Master router before determining that the Master router is dead. When Backup routers determine that the Master
router is dead, the Backup router with the highest priority becomes the new Master router. 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.
USING THE CLI
To change the Dead interval on the Backup VRRP router to 30 seconds, enter the following commands:
Router2(config)# inter e 1/5
Router2(config-if-1/5)# ip vrrp vrid 1
Router2(config-if-1/5-vrid-1)# dead-interval 30
syntax: dead-interval <value>
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