RE: Need info reg interface IP used as VIP in VRRP

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:[email protected]] 
	Sent: Monday, October 29, 2007 9:19 AM
	To: Ramya Shekar (rashekar); [email protected]
	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:[email protected]] 
		Sent: Saturday, October 27, 2007 8:01 AM
		To: [email protected]
		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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