From: nicky noname (cisco2study@gmail.com)
Date: Sat Oct 27 2007 - 13:50:52 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)
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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