From: Carlos Trujillo Jimenez (nergal888@hotmail.com)
Date: Thu Nov 29 2007 - 21:18:05 ART
Hi Juan Pablo. thanks for the response, but according to your output you
change the convergence time to 14 seconds, as a result of two times the
forward delay time = 8 + the max age =6 .
given totally to 14 seconds, but if the task states to 12 seconds?
Im trying to see another spanning tree method, maybe rapid spanning tree, or
mst.
Thanks.
>From: "Juan-Pablo Chapero Arenas" <jpchapero@terra.es>
>X-OriginalArrivalTime: 29 Nov 2007 00:41:22.0978 (UTC)
>FILETIME=[90CD6020:01C83220]
>
>Dear Carlos,
>
>The command you are configuring is in fact a macro that lowers the priority
>of the router in wich you are executing it in order to be choosen as root.
>Well, if you execute it in first switch, it will be the root. If you then
>execute it at the second switch it will change its priority to be elected
>as
>root for the vlan 1...
>
>When you execute the command, the macro clears the definitions you can have
>made on the spanning tree timming.
>
>After the macro, I recommend to adjust the timers by using...
>
>spanning-tree vlan 1 hello-time 1
>spanning-tree vlan 1 forward-time 4
>spanning-tree vlan 1 max-age 6
>
>that results in...
>
>Rack1SW1(config)#do sh spann vl 1
>
>VLAN0001
> Spanning tree enabled protocol ieee
> Root ID Priority 24577
> Address 0013.80dd.5500
> This bridge is the root
> Hello Time 1 sec Max Age 6 sec Forward Delay 4 sec
>
> Bridge ID Priority 24577 (priority 24576 sys-id-ext 1)
> Address 0013.80dd.5500
> Hello Time 1 sec Max Age 6 sec Forward Delay 4 sec
> Aging Time 300
>
>Hope it helps.
>
>Regards,
>
>JP
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Carlos Trujillo Jimenez
>Sent: miircoles, 28 de noviembre de 2007 23:28
>To: ccielab@groupstudy.com
>Subject: tunning spanning-tree timers.
>
>Hi group.
>
>if it is stated to adjust the timers to the minimal delay for a port to
>start forwarding frames, and if in the topology we have 2 root bridges, one
>defined as primary, and the other one as secondary, and the rest art only
>clients.
>
>My question states:
>MUST WE configure the following only in the primary root switch? or on both
>root switches? the primary and the secondary?
>
>sw2(config)#spanning-tree vlan 1 root primary diameter 2
>
>
>
>as a result we have the following:
>
>sw2#show spanning-tree vlan 1
>
>VLAN0001
> Spanning tree enabled protocol ieee
> Root ID Priority 24577
> Address 000a.b86a.0580
> This bridge is the root
> Hello Time 2 sec Max Age 10 sec Forward Delay 7 sec
>
>Another question from the same task is that the total delay time from a
>port
>
>to start forwarding frames after using this command converts from the
>traditional 50 seconds... to 24 seconds, so we now have fine tuned the
>network, to "converge" in 24 seconds.
>
>Now, if the task states to tune the network to converge in 12 seconds? how
>can we do this one? Does rappid spanning tree?
>
>Now Im trying to tune with pervlan spanning tree, but the less value I Can
>get is 24 seconds.. any idea? how can I get the 12 seconds?
>
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