Cisco Catalyst 4500 Series - Page 794

26-24
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 26 Configuring Optional STP Features
Enabling 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) : 0
Number of RLQ request PDUs received (all VLANs) : 0
Number of RLQ response PDUs received (all VLANs) : 0
Number of RLQ request PDUs sent (all VLANs) : 0
Number of RLQ response PDUs sent (all VLANs) : 0
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 is enabled
PortFast Edge BPDU Guard Defaultis disabled
Portfast Edge BPDU Filter Default is disabled
Portfast Default is disabled
Bridge Assurance is enabled
Loopguard Default is disabled
UplinkFast is disabled
BackboneFast is disabled
Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 3 3
VLAN1002 0 0 0 2 2
VLAN1003 0 0 0 2 2
VLAN1004 0 0 0 2 2
VLAN1005 0 0 0 2 2
---------------------- -------- --------- -------- ---------- ----------
5 vlans 0 0 0 11 11
BackboneFast statistics
-----------------------
Number of transition via backboneFast (all VLANs) :0
Number of inferior BPDUs received (all VLANs) :0
Number of RLQ request PDUs received (all VLANs) :0
Command Purpose
Step 1
Switch(config)# [no] spanning-tree backbonefast
Enables BackboneFast.
Use You can use the no keyword to disable
BackboneFast.
Step 2
Switch(config)# end
Exits configuration mode.
Step 3
Switch# show spanning-tree backbonefast
Verifies that BackboneFast is enabled.