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Enterasys Xpedition User Reference Manual 119

Monitoring VRRP

To set the advertisement interval to 3 seconds:

Setting Pre-empt Mode

When a Master router goes down, the Backup with the highest priority takes over the IP

addresses associated with the Master. By default, when the original Master comes back up

again, it takes over from the Backup router that assumed its role as Master. When a VRRP

router does this, it is said to be in pre-empt mode. Pre-empt mode is enabled by default on

the XP. You can prevent a VRRP router from taking over from a lower-priority Master by

disabling pre-empt mode. To do this, enter the following command in Configure mode:

To prevent a Backup router from taking over as Master from a Master router that has a

lower priority:

Note: If the IP address owner is available, then it will always take over as the Master,

regardless of whether pre-empt mode is on or off.

Setting an Authentication Key

By default, no authentication of VRRP packets is performed on the XP. You can specify a

clear-text password to be used to authenticate VRRP exchanges. To enable authentication,

enter the following command in Configure mode

To authenticate VRRP exchanges on virtual router 1 on interface int1 with a password of

‘yago’:

Note: The XP does not currently support the IP Authentication Header method of

authentication.

Monitoring VRRP

The XP provides two commands for monitoring a VRRP configuration: ip-redundancy

trace, which displays messages when VRRP events occur, and ip-redundancy show,

which reports statistics about virtual routers.

ssr(config)# ip-redundancy set vrrp 1 interface int1 adv-interval 3

ssr(config)# ip-redundancy set vrrp 1 interface int1 preempt-mode disabled

ssr(config)# ip-redundancy set vrrp 1 interface int1 auth-type text auth-key yago

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Cabletron Systems SSIM-R8-02 Spécifications Page 139