Information Technology Reference
In-Depth Information
Configuration
The following commands will help you reduce startup delay on the Catalyst 2900XL and 3500XL
platforms:
2900XL#
conf t
2900XL(config)#
interface fastEthernet 0/1
2900XL(config-if)#
spanning-tree portfast
2900XL(config-if)#
exit
2900XL(config)#
exit
2900XL#
copy run start
This platform is like the router IOS; you must save the configuration (
copy run start
) if you want it to
be permanently saved.
Verification
To verify that PortFast is enabled, use this command:
2900XL#
show spanning-tree interface fastEthernet 0/1
Interface Fa0/1 (port 13) in Spanning tree 1 is FORWARDING
Port path cost 19, Port priority 128
Designated root has priority 8192, address 0010.0db1.7800
Designated bridge has priority 32768, address 0050.8039.ec40
Designated port is 13, path cost 19
Timers: message age 0, forward delay 0, hold 0
BPDU: sent 2105, received 1
The port is in the portfast mode
Or, just look at the switch configuration.
2900XL#
show running-config
Building configuration...
Current configuration:
!
version 11.2
...
!
interface VLAN1
ip address 172.16.84.5 255.255.255.0
no ip route-cache
!
interface FastEthernet0/1
spanning-tree portfast
!
interface FastEthernet0/2
!
...
Timing Tests on the Catalyst 2900XL
The following steps show how to measure the effect of using PortFast on the 2900XL switch:
