Need info reg interface IP used as VIP in VRRP

[Ramya Shekar (rashekar)]

Hi all,

 

Can anyone explain how the behavior of VRRP is when interface ip is configured as a VIP?

 

In particular, I need this scenario. 

 

    * Router A and router B exist with VRRP configured in them.

    

    * VR ID is 1 & VIP is interface ip address of A in both routers A and B and hence A is Master with priority 255 & B is Backup.

   

    * Through object tracking, priority of A is reduced from 255 (say the case being another interface in router A going down & by tracking, the priority of VR 1 in router A goes down).

 

    *  In this case, will A be preempted by B and thus will B become the master of the VIP which is the same as one of the interface ip addresses of router A? Or will A continue to remain the Master as the VIP is its interface IP address?

 

Thanks,

Ramya  

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[Stephen Nadas (RL/TNT)]

Ramya,

To my understanding, if the interface address is also the VIP address, that router owniing the IP address will always assume ownership, essentially if the VIP is an interface address its priority is always 255 (A will keep mastership).   I suspect object tracking maybe somewhat out of scope on this list, but, to my understanding, something external to VRRP that trys, in response to some other event, to decrement the VRRP priority for an VIP that is also an interface address cannot change the VRRP priority.   Put another way, if you want to use techniques like object tracking, I don't see how this can also use VIP addresses that are also interface addresses.  I also don't see why it is necessary to do so; I think you can do what you want without using interface addresses.

Steve   

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From: Ramya Shekar (rashekar) [mailto:rashekar@...]
Sent: Saturday, October 27, 2007 8:01 AM
To: vrrp@...
Subject: [VRRP] Need info reg interface IP used as VIP in VRRP

Hi all,

 

Can anyone explain how the behavior of VRRP is when interface ip is configured as a VIP?

 

In particular, I need this scenario. 

 

    * Router A and router B exist with VRRP configured in them.

    

    * VR ID is 1 & VIP is interface ip address of A in both routers A and B and hence A is Master with priority 255 & B is Backup.

   

    * Through object tracking, priority of A is reduced from 255 (say the case being another interface in router A going down & by tracking, the priority of VR 1 in router A goes down).

 

    *  In this case, will A be preempted by B and thus will B become the master of the VIP which is the same as one of the interface ip addresses of router A? Or will A continue to remain the Master as the VIP is its interface IP address?

 

Thanks,

Ramya  

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[John Cruz (johcruz)]

One implementation that supports object tracking (the implementation calls

it as monitored-circuit) forces the VIP to not to be the interface IP for exactly the

issue mentioned below by Steve.

 

John

---

From: Stephen Nadas [mailto:stephen.nadas@...]
Sent: Monday, October 29, 2007 9:19 AM
To: Ramya Shekar (rashekar); vrrp@...
Subject: RE: [VRRP] Need info reg interface IP used as VIP in VRRP

Ramya,

To my understanding, if the interface address is also the VIP address, that router owniing the IP address will always assume ownership, essentially if the VIP is an interface address its priority is always 255 (A will keep mastership).   I suspect object tracking maybe somewhat out of scope on this list, but, to my understanding, something external to VRRP that trys, in response to some other event, to decrement the VRRP priority for an VIP that is also an interface address cannot change the VRRP priority.   Put another way, if you want to use techniques like object tracking, I don't see how this can also use VIP addresses that are also interface addresses.  I also don't see why it is necessary to do so; I think you can do what you want without using interface addresses.

Steve   

---

From: Ramya Shekar (rashekar) [mailto:rashekar@...]
Sent: Saturday, October 27, 2007 8:01 AM
To: vrrp@...
Subject: [VRRP] Need info reg interface IP used as VIP in VRRP

Hi all,

 

Can anyone explain how the behavior of VRRP is when interface ip is configured as a VIP?

 

In particular, I need this scenario. 

 

    * Router A and router B exist with VRRP configured in them.

    

    * VR ID is 1 & VIP is interface ip address of A in both routers A and B and hence A is Master with priority 255 & B is Backup.

   

    * Through object tracking, priority of A is reduced from 255 (say the case being another interface in router A going down & by tracking, the priority of VR 1 in router A goes down).

 

    *  In this case, will A be preempted by B and thus will B become the master of the VIP which is the same as one of the interface ip addresses of router A? Or will A continue to remain the Master as the VIP is its interface IP address?

 

Thanks,

Ramya  

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