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List: ietf-vrrp
Subject: RE: [VRRP] Need info reg interface IP used as VIP in VRRP
From: "John Cruz (johcruz)" <johcruz () cisco ! com>
Date: 2007-10-29 17:30:49
Message-ID: 9D0602B62D632D499E0A26CBCDA74A7D02682B0E () xmb-sjc-22a ! amer ! cisco ! com
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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@ericsson.com]
Sent: Monday, October 29, 2007 9:19 AM
To: Ramya Shekar (rashekar); vrrp@ietf.org
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@cisco.com]
Sent: Saturday, October 27, 2007 8:01 AM
To: vrrp@ietf.org
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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<DIV dir=ltr align=left><SPAN class=144561917-29102007><FONT face=Arial
color=#0000ff size=2>One implementation that supports object tracking (the
implementation calls</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=144561917-29102007><FONT face=Arial
color=#0000ff size=2>it as monitored-circuit) forces the VIP to not to be
</FONT></SPAN><SPAN class=144561917-29102007><FONT face=Arial color=#0000ff
size=2>the interface IP for exactly the</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=144561917-29102007><FONT face=Arial
color=#0000ff size=2>issue mentioned below by Steve.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=144561917-29102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=144561917-29102007><FONT face=Arial
color=#0000ff size=2>John</FONT></SPAN></DIV><BR>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; \
MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Stephen Nadas
[mailto:stephen.nadas@ericsson.com] <BR><B>Sent:</B> Monday, October 29, 2007
9:19 AM<BR><B>To:</B> Ramya Shekar (rashekar);
vrrp@ietf.org<BR><B>Subject:</B> RE: [VRRP] Need info reg interface IP used as
VIP in VRRP<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=734430016-29102007><FONT face=Arial color=#0000ff
size=2>Ramya,</FONT></SPAN></DIV>
<DIV><SPAN class=734430016-29102007><FONT face=Arial color=#0000ff size=2>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.
</FONT></SPAN></DIV>
<DIV><SPAN class=734430016-29102007><FONT face=Arial color=#0000ff
size=2>Steve </FONT></SPAN></DIV><BR>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; \
MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Ramya Shekar (rashekar)
[mailto:rashekar@cisco.com] <BR><B>Sent:</B> Saturday, October 27, 2007 8:01
AM<BR><B>To:</B> vrrp@ietf.org<BR><B>Subject:</B> [VRRP] Need info reg
interface IP used as VIP in VRRP<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2><SPAN class=609111211-27102007>Hi
all,</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=609111211-27102007>Can anyone
explain how the behavior of VRRP is when interface ip is configured as a
VIP?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=609111211-27102007>In particular, I
need this scenario. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007> * Router A and router B
exist with VRRP configured in them.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007> </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007> * 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.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007> </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007> * 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).</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007> * 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?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007></SPAN></FONT><FONT face=Arial size=2><SPAN
class=609111211-27102007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007>Thanks,</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=609111211-27102007>Ramya </SPAN></FONT></DIV></FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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