From: nicky noname (cisco2study@gmail.com)
Date: Sat Oct 27 2007 - 15:43:56 ART
Hello,
I have two conflicting methods of making a vlan converge asap.
The first is:
spanning-tree vlan 36 root primary diameter 3 hello-time 1
{ this will calculate a forward time of 5 and max age of 7......adding to a
convergence time of 17 sec. But I think this may be the accepted answer? } {
see output below}
The second is:
Rack8SW3(config)# spanning-tree vlan 36 forward-time 4
Rack8SW3(config)# spanning-tree vlan 36 max-age 6
{ These commands will give a convergence time of 14 seconds.} {see output
below}
I would really appreciate an experienced opinion on this. ( in relation to
the question)
I have searched through the archives and found similar question answered.
They recommend that you keep it simple. Don't change something if you are
not asked. Well he you are not really given a hole not of direction. vlan 36
should converge as fast as possible. Nothing about any
specifics.................
Thanks
Nic
##############################################
Rack8SW3(config)#spanning-tree vlan 36 root primary diameter 3 hello-time 1
Rack8SW3(config)#do sh span vlan 36
VLAN0036
Spanning tree enabled protocol ieee
Root ID Priority 24612
Address 0009.e8e2.fc00
This bridge is the root
Hello Time 1 sec Max Age 7 sec Forward Delay 5 sec
Bridge ID Priority 24612 (priority 24576 sys-id-ext 36)
Address 0009.e8e2.fc00
Hello Time 1 sec Max Age 7 sec Forward Delay 5 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/3 Desg FWD 19 128.3 P2p
Fa0/16 Desg FWD 19 128.16 P2p
Fa0/17 Desg FWD 19 128.17 P2p
Fa0/18 Desg FWD 19 128.18 P2p
Fa0/19 Desg FWD 19 128.19 P2p
Fa0/20 Desg FWD 19 128.20 P2p
Fa0/21 Desg FWD 19 128.21 P2p
###################################################
Rack8SW3(config)# spanning-tree vlan 36 forward-time ?
<4-30> number of seconds for the forward delay timer
Rack8SW3(config)# spanning-tree vlan 36 forward-time 4
Rack8SW3(config)# spanning-tree vlan 36 max
Rack8SW3(config)# spanning-tree vlan 36 max-age ?
<6-40> maximum number of seconds the information in a BPDU is valid
Rack8SW3(config)# spanning-tree vlan 36 max-age 6
Rack8SW3(config)#do sh span vlan 36
VLAN0036
Spanning tree enabled protocol ieee
Root ID Priority 24612
Address 0009.e8e2.fc00
This bridge is the root
Hello Time 2 sec Max Age 6 sec Forward Delay 4 sec
Bridge ID Priority 24612 (priority 24576 sys-id-ext 36)
Address 0009.e8e2.fc00
Hello Time 2 sec Max Age 6 sec Forward Delay 4 sec
Aging Time 15
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/3 Desg FWD 19 128.3 P2p
Fa0/16 Desg FWD 19 128.16 P2p
Fa0/17 Desg FWD 19 128.17 P2p
Fa0/18 Desg FWD 19 128.18 P2p
Fa0/19 Desg FWD 19 128.19 P2p
Fa0/20 Desg FWD 19 128.20 P2p
Fa0/21 Desg FWD 19 128.21 P2p
#########################################################
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