From: Usankin, Andrew (Andrew.Usankin@twtelecom.com)
Date: Fri Aug 24 2007 - 19:34:47 ART
IMHO, as you are trying to get CCIE on the lab you have to follow best
practices of Cisco whenever it is possible.
It this particular case I'd go forward and nail my root down, plus I'd
make sure I nailed down my back up root switch also, so no unexpected
tricks will be there.
As to the changes in additional parameters as forward-delay and max-age
- Cisco's best practice is to leave them alone :)
By the way, topology of four switches has a diameter of 3, remember
that.
Andrew
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Morris
Sent: Friday, August 24, 2007 3:18 PM
To: 'Toh Soon, Lim'; 'Cisco certification'
Subject: RE: Which approach to change spanning-tree hello-time?
If the lab doesn't specify anything about who is to be a root bridge,
you can pick either method.
As for specifying the extra parameters, if you aren't asked to, my
advice is don't do it. No sense introducing other things that in some
weird convoluted sense of reality may introduce extra problems in your
topology.
Do what they ask, no more, no less....
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
JNCIE #153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Toh
Soon, Lim
Sent: Friday, August 24, 2007 10:17 AM
To: Cisco certification
Subject: Which approach to change spanning-tree hello-time?
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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