From: paul (paul_hwang@hanmail.net)
Date: Thu Jan 08 2004 - 14:36:04 GMT-3
Hi Bob,
Thanks for clear explanation.
Anyone deployed the rapid-PVST+ in production, how about this stability
compared with the PVST+. Any bad experience?
Cheers,
Paul.
---------[ 9^@: 8^@O 3;?k ]----------
A&8q : Re: hsrp and stp (how to avoid second outage)
3/B% : Thu, 8 Jan 2004 11:51:21 -0500
:83=@L : "Bob Sinclair" <bsinclair@netmasterclass.net>
9^4B@L : "paul" <paul_hwang@hanmail.net>, <ccielab@groupstudy.com>
Paul,
AFAIK, there is no comparable "preempt/no preempt" feature int STP.
Of
course, you could manally raise the priority of the old root bridge
before
restoring it if the outage scenario allows (an IOS upgrade, for
example).
You are right to be concerned about the "fail-back" delay. If you run
Uplinkfast on your access switches, for example, then you will get
1-2
second failover to the new root port if the root bridge fails. But
when the
root bridge comes back you will have a 30-second outage as the active
root
port immediately closes and the new root port goes through listening
and
learning.
You could speed this up by tweaking the timers, or you could consider
rapid-pvst+ if all your switches support it.
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "paul"
To:
Sent: Thursday, January 08, 2004 10:52 AM
Subject: hsrp and stp (how to avoid second outage)
> HI all,
>
> Assuming that configured the HSRP and STP on the active and standby
> distribution switches.
>
> In case of HSRP, we can use the preemt option to return to the
original
> primary switch once the primary switch recovered. That is, without
the
> preemp option, secondary switch keeps active continually after the
> primary fails.
>
> Wondering how about the STP.
>
> I configured the PVST+ between Cat6500 and Cat4000 switches.
>
> If the root bridge fails, secondary root bridge will take over to
active.
>
> And then, what happen after the original primary swith recovered. I
> understand the original primary switch will regain the root bridge.
That
> is, it will bring sencond outage as the HSRP preempt option do.
Then how
> can configure the switch so the secondary root bridge keeps the
active
> though the original primary returned.
>
> TIA,
>
> Paul.
>
>
"?l8. @NEM3], Daum" http://www.daum.net !:Fr;}>24B 9+7a GQ8^@O3]!;
[IMAGE]
GA8.9L>v 8^@O =a:8<L>n?d?
:|8% @|<[,Fm8.GQ 1b4I@G 3*88@G 0mG00] 8BCc 8^@O!
[IMAGE]
[IMAGE]
[IMAGE]
This archive was generated by hypermail 2.1.4 : Mon Feb 02 2004 - 09:07:38 GMT-3