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Good to know Dave.
It depends on the diameter though. Diameter of 3 gives Fwdelay=5;
SW2(config)#spanning-tree vlan 1 root primary diameter 3 hello-time 1 SW2(config)# SW2#sh spanning-tree vlan 1 | i VLAN|ID|Forward VLAN0001 Root ID Priority 24577 Hello Time 1 sec Max Age 7 sec Forward Delay 5 sec Bridge ID Priority 24577 (priority 24576 sys-id-ext 1) Hello Time 1 sec Max Age 7 sec Forward Delay 5 sec
While diameter of 6 gives Fwdelay=8;
SW2(config)#spanning-tree vlan 1 root primary diameter 6 hello-time 1 SW2(config)# SW2#sh spanning-tree vlan 1 | i VLAN|ID|Forward VLAN0001 Root ID Priority 24577 Hello Time 1 sec Max Age 11 sec Forward Delay 8 sec Bridge ID Priority 24577 (priority 24576 sys-id-ext 1) Hello Time 1 sec Max Age 11 sec Forward Delay 8 sec
Paul Schuuring

“Schulz, Dave”
08/13/2006 04:55 PM
To “Paul Schuuring” , “tony hall” cc Subject RE: Spanning-Tree

There is yet another way to do this (if something in the scenario won’t let you directly use that forward-time command)……
You can use the extensions on this command:
spanning-tree vlan xx root diameter hello-time
Setting the hello-time to 1 sec will automatically add the commands for the forward-time of 5seconds and a max-age time of 7 seconds. (either primary or secondary both work).
Just another way to do something.
Dave Schulz Email: dschulz@dpsciences.com

—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Paul Schuuring Sent: Sunday, August 13, 2006 9:26 AM To: tony hall Cc: ccielab@groupstudy.com Subject: Re: Spanning-Tree
Hi Tony,
When they ask you to set the time fixed to 5 seconds. It’s more likely to adjust the forwarding time;
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225see/scg/s wstp. htm#wp1150580
Configure the forward time of a VLAN. The forward delay is the number of seconds a port waits before changing from its spanning-tree learning and listening states to the forwarding state.
SW2(config)#spanning-tree vlan 1 forward-time 5
SW2#sh spanning-tree vlan 1 | i VLAN|ID|Forward VLAN0001 Root ID Priority 24577 Hello Time 2 sec Max Age 20 sec Forward Delay 5 sec Bridge ID Priority 24577 (priority 24576 sys-id-ext 1) Hello Time 2 sec Max Age 20 sec Forward Delay 5 sec

Paul Schuuring

“tony hall”
Sent by: nobody@groupstudy.com 08/13/2006 01:41 PM Please respond to “tony hall”
To ccielab@groupstudy.com cc
Subject Spanning-Tree

Hi Group, Can some one explain to me that how can I shortened the time for listening
and learning to 5 sec on my switch.Please if some one can explain in bit detail.
Regards, Tony.
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