From: Usankin, Andrew (Andrew.Usankin@twtelecom.com)
Date: Fri Aug 24 2007 - 15:22:21 ART
So far as I understand, configuration BPDUs are BPDUs that root bridge
sends every hello interval. So if you want to reduce their amount you
want to increase hello interval.
Per Lim's question I'd recommend use first method witch will warranty
root selection in spanning-tree domain. Because if switch loses election
as a root it won't use configured values and instead will accept values
from elected root.
Andrew.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
K S
Sent: Friday, August 24, 2007 10:28 AM
To: tohsoon28@gmail.com; ccielab@groupstudy.com
Subject: RE: Which approach to change spanning-tree hello-time?
Hi Lim,
Config BPDUs nothing to do with hello time.
try this link http://www.cisco.com/warp/public/473/122.html
Regards,KS
>From: "Toh Soon, Lim" <tohsoon28@gmail.com>
>Reply-To: "Toh Soon, Lim" <tohsoon28@gmail.com>
>To: "Cisco certification" <ccielab@groupstudy.com>
>Subject: Which approach to change spanning-tree hello-time?
>Date: Fri, 24 Aug 2007 22:17:23 +0800
>
>Hi Group,
>
>I have a fundamental question to seek clarification.
>
>If the task requires you to reduce the number of Config BPDUs sent to
>half of the default value, I'd take it to mean increasing the STP hello
>timer to
>4 seconds.
>
>There's no indication which switch should be the root. I'd leave all
>bridge priority to default 32,768.
>
>How do you approach this task? I can think of two methods as follows:
>
>Method 1
>--------
>Pick any switch and configure the command:
>
>spanning-tree vlan 1-4094 root primary diameter 2 hello-time 4
>
>This has the side-effect of making this switch the root and thus start
>to advertise the new adjusted timers to the other switches.
>
>Method 2
>--------
>Identify the current root and only change the hello timer on it with
>the
>command:
>
>spanning-tree vlan 1-4094 hello-time 4
>
>Should I even adjust the forward-delay and max-age timers as well?
>
>
>Thank you.
>
>B.Rgds,
>Lim TS
>
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