From: xh_liu (xh_liu@xxxxxxxxxxxxxxxx)
Date: Mon Apr 23 2001 - 10:40:34 GMT-3
----- Original Message -----
From: Tariq Sharif <tariq_sharif@btinternet.com>
To: Ccielab@Groupstudy. Com <ccielab@groupstudy.com>
Sent: Monday, April 23, 2001 8:07 PM
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)?
See:BackboneFast, which will improve convergence with 20s(Max age time).
Blocked port jump to listening ->learning(15s);
learning->forwarding(15s);
> 2) For improving convergence on direct link failures do you just decrease
> Forward delay (using set spantree fwddelay command)?
See:Uplinkfast,which keep convergence time within 1-5s.
> 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.
>
Yes if you change the timers on root this will be propagated to all other switc
hes by
BPDUs, and only this timers's value is used by SPT. Other non-root bridge's ti
mers will
be used only when the bridge became root bridge next time(Perhaps topology chan
ge).
> Any ideas please?
>
> Many thanks & regards.
>
> Tariq Sharif
>
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name of winmail.dat]
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