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VRRP

Tien_Huy1995
Level 1
Level 1

what's meaning of " track 1 interface f0/1 line-protocol" and " vrrp 1 track  decrement 60" ?

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Hi

It is a kind of penalty, the track command is used to verify the stability of a interface, when the track detects the interface is down it substracts a value of the HSRP or VRRP priority, by default in HSRP the subtracted value is 10.

Imagine the active HSRP has default track configured and a priority value of 105 and the standby HSRP has a priority of 100. If the track is triggered it will substract 10 to 105 so the new priority for the active HSRP will be decreased to 95, so the roles will be swapped and the current standby HSRP will be take the active HSRP role.

In you case decrement 60, will substract 60 of the VRRP priority configured.

How Object Tracking Affects the Priority of a VRRP Router

The priority of a device can change dynamically if it has been configured for object tracking and the object that is being tracked goes down. The tracking process periodically polls the tracked objects and notes any change of value. The changes in the tracked object are communicated to VRRP, either immediately or after a specified delay. The object values are reported as either up or down. Examples of objects that can be tracked are the line protocol state of an interface or the reachability of an IP route. If the specified object goes down, the VRRP priority is reduced. The VRRP router with the higher priority can now become the virtual router master if it has the vrrp preempt command configured. See the VRRP Object Tracking section for more information on object tracking.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/12-4/fhp-12-4-book/fhp-vrrp.html#GUID-8CB0B992-72CE-4D60-916D-9D0EDD79C5AB

 https://mellowd.co.uk/ccie/?p=827

Please rate the comment if it is useful

:-)




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

View solution in original post

3 Replies 3

Hi

It is a kind of penalty, the track command is used to verify the stability of a interface, when the track detects the interface is down it substracts a value of the HSRP or VRRP priority, by default in HSRP the subtracted value is 10.

Imagine the active HSRP has default track configured and a priority value of 105 and the standby HSRP has a priority of 100. If the track is triggered it will substract 10 to 105 so the new priority for the active HSRP will be decreased to 95, so the roles will be swapped and the current standby HSRP will be take the active HSRP role.

In you case decrement 60, will substract 60 of the VRRP priority configured.

How Object Tracking Affects the Priority of a VRRP Router

The priority of a device can change dynamically if it has been configured for object tracking and the object that is being tracked goes down. The tracking process periodically polls the tracked objects and notes any change of value. The changes in the tracked object are communicated to VRRP, either immediately or after a specified delay. The object values are reported as either up or down. Examples of objects that can be tracked are the line protocol state of an interface or the reachability of an IP route. If the specified object goes down, the VRRP priority is reduced. The VRRP router with the higher priority can now become the virtual router master if it has the vrrp preempt command configured. See the VRRP Object Tracking section for more information on object tracking.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp_fhrp/configuration/12-4/fhp-12-4-book/fhp-vrrp.html#GUID-8CB0B992-72CE-4D60-916D-9D0EDD79C5AB

 https://mellowd.co.uk/ccie/?p=827

Please rate the comment if it is useful

:-)




>> Marcar como útil o contestado, si la respuesta resolvió la duda, esto ayuda a futuras consultas de otros miembros de la comunidad. <<

Thanks your help :) (cảm ơn nhiều vietnamese)

Hi ! I can't confit "no preempt on router " ,it only can config "preempt delay "

what reason ? 

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