Which approach to change spanning-tree hello-time?

From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Fri Aug 24 2007 - 11:17:23 ART

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

This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:13 ART