Cisco Catalyst 4500 Series Software Configuration Manual page 794

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
Switch is in rapid-pvst mode
Root bridge for:VLAN0001, VLAN1002-VLAN1005
EtherChannel misconfiguration guard is enabled
Extended system ID
PortFast Edge BPDU Guard Defaultis disabled
Portfast Edge BPDU Filter Default is disabled
Portfast Default
Bridge Assurance
Loopguard Default
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)
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
26-24
Purpose
Enables BackboneFast.
Use You can use the no keyword to disable
BackboneFast.
Exits configuration mode.
Verifies that BackboneFast is enabled.
is enabled
is disabled
is enabled
is disabled
is disabled
is disabled
Blocking Listening Learning Forwarding STP Active
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
Chapter 26 Configuring Optional STP Features
: 0
: 0
: 0
: 0
: 0
3 3
2 2
2 2
2 2
2 2
11 11
:0
:0
:0