4500 - Changing from Layer2 to Layer3 on an interface causes switch to hang

[craigallen]

When issuing the NO SWITCHPORT command on a 4500 the switch hangs. The only workaround at the mement is to shut the interface down before changing processing layer on the interface.

[Prashanth Krishnappa]

What IOS are you running.. Are you able to recreate it everytime. I tested in lab and it works fine.

Switch#sh ver | include IOS

Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EWA, RELEASE SOFTWARE (fc1)

Switch#sh run interface fastEthernet 5/48

Building configuration...

Current configuration : 58 bytes

!

interface FastEthernet5/48

switchport mode access

end

Switch#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Switch(config)#int fas5/48

Switch(config-if)#no switchport

Switch(config-if)#ip add

Switch(config-if)#ip address 14.1.24.103 255.255.255.0

Switch(config-if)#end

Switch#

3d02h: %SYS-5-CONFIG_I: Configured from console by cisco on console

Switch#ping 14.1.24.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 14.1.24.1, timeout is 2 seconds:

.!!!!

Success rate is 80 percent (4/5), round-trip min/avg/max = 1/3/4 ms

Switch#