From: Jeff.Kline@xxxxxxxxxxxxxxx
Date: Mon Apr 23 2001 - 12:04:05 GMT-3
Be careful when changing any of the STP timers because the potential, small
gain in reconvergence time may lead to instability. Be sure to consider
your network diameter as well. On indirect failures, you can run
backbonefast on all the switches. This will 'tell' the switches to go into
the listening state immediately instead of waiting for the maxage timer to
expire first when there is an indirect failure . You can change all the STP
timers on any switch, but only the root bridges values will be used. For
consistency, though, it is a good idea to have the timers on all the
switches set to be the same. This way, if you do lose your root bridge for
whatever reason, the layer 2 topology should reconverge as quickly as
possible. You should also consider setting a secondary root bridge for each
VLAN and use uplinkfast where possible - with the same timer settings, of
course. You would probably be better off using backbonefast and uplinkfast
than trying to tweak the STP timers.
Hope this helps....
-----Original Message-----
From: Tariq Sharif [mailto:tariq_sharif@btinternet.com]
Sent: Monday, April 23, 2001 7:08 AM
To: Ccielab@Groupstudy. Com
Subject: STP Timers Clarification
I've been using Kennedy Clark's Cisco LAN Switching book to do STP. Not
clear on STP timers adjustment.
1) For improving convergence on indirect link failures do you just decrease
Max age (using set spantree maxage command)?
2) For improving convergence on direct link failures do you just decrease
Forward delay (using set spantree fwddelay command)?
3) Book says can only do this on Root bridge, but I can change them on all
switches- And there seem to be 2 timers one for Root bridge & one for local
bridge, I thought if you change the timers on root this will be propagated
to all other switches.
Any ideas please?
Many thanks & regards.
Tariq Sharif
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