Cisco Catalyst 4500 Series Configuration Manual page 612

Enabling BackboneFast
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
Name
---------------------- -------- --------- -------- ---------- ----------
VLAN0001
VLAN1002
VLAN1003
VLAN1004
VLAN1005
---------------------- -------- --------- -------- ---------- ----------
5 vlans
BackboneFast statistics
-----------------------
Number of transition via backboneFast (all VLANs)
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)
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
23-16
Purpose
Enables BackboneFast.
Use 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
Blocking Listening Learning Forwarding STP Active
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Chapter 23 Configuring Optional STP Features
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