Enabling Backbonefast - Cisco 4500M Software Manual

Chapter 15 Configuring STP Features
VLAN15
VLAN1002
VLAN1003
VLAN1004
VLAN1005
Switch#

Enabling BackboneFast

For BackboneFast to work, you must enable it on all switches in the network. BackboneFast is supported
Note
for use with third-party switches but it is not supported on Token Ring VLANs.
To enable BackboneFast, perform this task:
Command
Step 1
Switch(config)# [no] spanning-tree backbonefast
Step 2
Switch(config)# end
Step 3
Switch# show spanning-tree backbonefast
This example shows how to enable BackboneFast:
Switch(config)# spanning-tree backbonefast
Switch(config)# end
Switch#
This example shows how to verify that BackboneFast is enabled:
Switch# show spanning-tree backbonefast
BackboneFast is enabled
BackboneFast statistics
-----------------------
Number of transition via backboneFast (all VLANs) : 0
Number of inferior BPDUs received (all VLANs)
Number of RLQ request PDUs received (all VLANs)
Number of RLQ response PDUs received (all VLANs)
Number of RLQ request PDUs sent (all VLANs)
Number of RLQ response PDUs sent (all VLANs)
Switch#
This example shows how to display a summary of port states:
Switch#show spanning-tree summary
Root bridge for:VLAN0001, VLAN1002-VLAN1005
Extended system ID
Portfast
PortFast BPDU Guard
Portfast BPDU Filter is enabled by default
Loopguard
EtherChannel misconfiguration guard is enabled
UplinkFast
BackboneFast
Pathcost method used is short
OL-6696-01
Gi5/7(fwd)
Gi5/7(fwd)
Gi5/7(fwd)
Gi5/7(fwd)
Purpose
Enables BackboneFast.
You can use the no keyword to disable BackboneFast.
Exits configuration mode.
Verifies that BackboneFast is enabled.
is disabled
is enabled by default
is disabled by default
is disabled by default
is enabled
is enabled
Software Configuration Guide—Release 12.2(25)EW
Enabling BackboneFast
: 0
: 0
: 0
: 0
: 0
15-15