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#

[craigallen]

I am able to replicate everytime. The TAC case is 601584841. Running 12.2.25EWA1

[Prashanth Krishnappa]

I tried it with EWA1 as well and it works fine. What kind of interface are you issuing "no switchport" under. What other config does it have?

Switch#sh ver | include IOS

Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I5S-M), Version 12.2(25)EWA1, RELEASE SOFTWARE (fc1)

Switch#

[craigallen]

Hi

I attach show ver, show mod and show platform crashdump

YNRAMSS01#sho module

Chassis Type : WS-C4506

Power consumed by backplane : 0 Watts

Mod Ports Card Type Model Serial No.

---+-----+--------------------------------------+------------------+-----------

1 2 Supervisor IV 1000BaseX (GBIC) WS-X4515 JAE07371U09

2 6 1000BaseX (GBIC) WS-X4306-GB JAE0745060R

5 48 10/100/1000BaseT (RJ45) WS-X4548-GB-RJ45 JAE07440EK3

M MAC addresses Hw Fw Sw Status

--+--------------------------------+---+------------+----------------+---------

1 000d.ed6d.2700 to 000d.ed6d.2701 3.0 12.1(12r)EW 12.2(25)EWA1 Ok

2 000b.5f3c.9c1c to 000b.5f3c.9c21 2.2 Ok

5 000e.3887.f9d0 to 000e.3887.f9ff 1.0 Ok

YNRAMSS01#

[craigallen]

YNRAMSS01#sho ver

Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I5S-M), Version 12.2(25)EWA1, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Mon 25-Apr-05 15:37 by kellmill

Image text-base: 0x10000000, data-base: 0x114D5CF4

ROM: 12.1(12r)EW

Dagobah Revision 95, Swamp Revision 28

YNRAMSS01 uptime is 6 hours, 44 minutes

System returned to ROM by power-on

System restarted at 10:48:37 UTC Thu Jun 30 2005

System image file is "bootflash:cat4000-i5s-mz.122-25.EWA1.bin"

cisco WS-C4506 (MPC8245) processor (revision 7) with 524288K bytes of memory.

Processor board ID FOX074102UK

MPC8245 CPU at 333Mhz, Supervisor IV

Last reset from PowerUp

5 Virtual Ethernet interfaces

56 Gigabit Ethernet interfaces

403K bytes of non-volatile configuration memory.

Configuration register is 0x2102

YNRAMSS01#

[craigallen]

Crashdump

[peter290457]

Probably not related to your problem but we ran 12.2(25)EWA1 for a couple of hours. Found CPU running about twice normal - we hit a bug (cannot remember the number).

Now running 12.2(20)EWA1 without a problem so far.