From: Church, Chuck (cchurch@wamnetgov.com)
Date: Sun May 16 2004 - 18:05:56 GMT-3
Picture 2 routers, each with a single connection to the LAN (where the
HSRP is run) and a single WAN connection, each to the same destination.
You want router 'A' to be the active HSRP router, because it's WAN
connection is a DS-3. Router 'B' has a T1. So you tell router 'A' to
preempt, because if the DS-3 is up, you want it to assume the HSRP
address right away. On the other hand, if 'B' becomes the higher
priority HSRP router, it's because 'A' lowered it's priority due to the
tracking of the failed DS-3. So you'd want 'B' to be able to preempt
also. Hope that clears it up.
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Wam!Net Government Services - Design & Implementation Team
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@wamnetgov.com
PGP key:
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.
com
-----Original Message-----
From: Ahmed Mustafa [mailto:ahmed.mustafa@sbcglobal.net]
Sent: Sunday, May 16, 2004 2:44 PM
To: Church, Chuck
Subject: Re: HSRP
Is there any practical example you can give. Why would you want to
configure preempt at both ends if tracking is configured.
----- Original Message -----
From: "Church, Chuck" <cchurch@wamnetgov.com>
To: <EdmondsSG@aol.com>; <james@net-brigade.com>;
<ahmed.mustafa@sbcglobal.net>; <ccielab@groupstudy.com>
Sent: Sunday, May 16, 2004 9:41 AM
Subject: RE: HSRP
> That's the exception. If you're using tracking and the priority can
> shift from one side to the other, then you'd want preempt on both. I
> was basing what I said on the example given. Sorry if I confused
> anyone.
>
>
> Chuck Church
> Lead Design Engineer
> CCIE #8776, MCNE, MCSE
> Wam!Net Government Services - Design & Implementation Team
> 13665 Dulles Technology Dr. Ste 250
> Herndon, VA 20171
> Office: 703-480-2569
> Cell: 703-819-3495
> cchurch@wamnetgov.com
> PGP key:
>
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.
> com
>
>
>
>
> _____
>
> From: EdmondsSG@aol.com [mailto:EdmondsSG@aol.com]
> Sent: Sunday, May 16, 2004 11:59 AM
> To: Church, Chuck; james@net-brigade.com; ahmed.mustafa@sbcglobal.net;
> ccielab@groupstudy.com
> Subject: Re: HSRP
>
>
> When you use 'standby track' command with HSRP - i belive you need
> prempt on both sides.
>
> any comments?
>
> Simon
>
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