From: Juan-Pablo Chapero Arenas (jpchapero@terra.es)
Date: Wed Nov 28 2007 - 21:44:12 ART
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?
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:31 ART