User guide

conﬁgure vrrp add track-servers-delta

ExtremeWarePx1 1.2 Command Reference Guide 173

conﬁgure vrrp add track-servers-delta

configure vrrp vrid

[<VRID number> | all]

add track-servers-delta <number>

Description

Enables server-health failover for the speciÞed VRRP class(es).

Syntax Description

Default

Server-health failover is disabled by default.

Usage Guidelines

You must have administrator privileges to issue this command.

You can use this command to enable server-health failover for one particular VRRP class or for all

currently conÞgured VRRP classes. For each speciÞed class:

¥ Neither switch should have master priority (255) for the class.

¥ Both switchesÕ preemption behavior for the class must be dont-preempt.

¥ You must conÞgure the same track-servers-delta limit for the class on both switches.

¥ If the speciÞed track-servers-delta limit is higher than the number of servers in the class, the limit

is set to the actual number of servers in the class.

You should not specify too low a number for the track-servers-delta limit. Too low a number may

cause ßappingÑan unstable state in which neither switch is active for a signiÞcant period of time.

You must use the build command to commit the conÞguration changes made by this command.

Example

The following command enables server-health failover for VRRP class 201, setting the

track-servers-delta limit to 10.

configure vrrp vrid 201 add track-servers-delta 10

If class 201 contains a total of 100 servers, this switch is the backup for class 201, and this switch sees 90

healthy servers in class 201, then this switch will attempt to become active for class 201 if its VRRP peer

sees 80 or fewer healthy servers.

VRID number The VRID of the VRRP class; a number between 1 and 255.

all Specifies all VRRP classes.

number Limit on the difference between the number of healthy servers of the class that this switch

sees and the number that the active switch sees; the number may not be less than 5.