HP ProCurve 1600M Kılavuz Eki - Sayfa 17

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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>