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Re: Catalyst 2950: front-end loopback test

 
 
Brian
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      07-07-2003
You got a bad switch, no, no way to repair it. The asic chips control 4
ports each, so basically asic chip# 11 is bad. There's a lifetime warranty
on the switch to the original purchaser, so just open a TAC case and get it
replaced.
-Brian
"Robert Perkuhn" <(E-Mail Removed)-aachen.de> wrote in message
news:bebj8f$oa5$(E-Mail Removed)-Aachen.DE...
> Hi!
>
> I have a problem concerning a Catalyst 2950-48:
>
>
> Cisco-3#sh post
> POST FAILED: FastEthernet0/41 failed front-end loopback test
> POST FAILED: FastEthernet0/42 failed front-end loopback test
> POST FAILED: FastEthernet0/43 failed front-end loopback test
> POST FAILED: FastEthernet0/44 failed front-end loopback test
> [...]
>
> Some searching on cisco.com brought up this link:
>

http://www.cisco.com/en/US/products/..._tech_note0918
6a0080125913.shtml#topicsub1
>
> According to that those ports are defective (I think it doesn't matter
> if it is a Catalyst 2900xl or a 2950-4.
> Am I right? Or is there a "software trick" to fix that?
> I aready did an "erase all"...
>
> Perhaps it helps if I describe how the error occured:
>
> I added a second vlan (Ports 41-4 where I wanted to connect some
> switches from other floors. So on this 2950-48 there should be clients
> connected to vlan1 and other switches and the uplink connected to vlan2.
>
> To create a connection between the clients in vlan1 and the uplink on
> vlan2 I used a crossover cable between port 1 and port 41. Up to this
> point everything went fine, the clients on vlan1 had a "normal" network
> connection. (actually I had only connected the uplink, the crossover
> cable and a client on port 2 since I was still testing).
>
> Then I changed the management vlan on the web-interface from vlan 1 to
> vlan 2. I did this from the client connected to port 2 (vlan 1). Because
> of the change of the management vlan I lost connection on the web
> interface, which is I think is a normal thing.
>
> But since then the ports belonging to vlan 2 wouldn't get into "state
> up" anymore.
>
> Any ideas?
>
> Tanks!!
>
> greetings
> robatp
>
> PS:
>
> Here are some system boot messages and a "sh ver" that might help:
>
> [...]
> POST: System Board Test : Passed
> POST: Ethernet Controller Test : Passed
> ASIC Initialization Passed
> cisco WS-C2950G-48-EI (RC32300) processor (revision G0) with 20402K
> bytes of mem
> ory.
> Processor board ID FOC0702X04M
> Last reset from system-reset
> Running Enhanced Image
> 40 FastEthernet/IEEE 802.3 interface(s)
> 2 Gigabit Ethernet/IEEE 802.3 interface(s)
> [...]
>
> Press RETURN to get started!
>
>
> 00:00:17: POST: Loop back Test Failed on FastEthernet0/41. Stateisabled
>
> 00:00:17: POST: Loop back Test Failed on FastEthernet0/42. Stateisabled
>
> 00:00:17: POST: Loop back Test Failed on FastEthernet0/43. Stateisabled
>
> 00:00:17: POST: Loop back Test Failed on FastEthernet0/44.
> Stateisabled
>
> [...]
>
> 00:00:17: %SPANTREE-5-EXTENDED_SYSID: Extended SysId enabled for type vlan
> 000011: 00:00:23: Fa0/42 can't be brought up because it failed POST in
> loopback
> test
> 000012: 00:00:23: Fa0/43 can't be brought up because it failed POST in
> loopback
> test
> 000013: 00:00:23: Fa0/44 can't be brought up because it failed POST in
> loopback
> [...]
>
> Switch>sh ver
> Cisco Internetwork Operating System Software
> IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(11)EA1, RELEASE
> SOFTWARE
> (fc1)
> Copyright (c) 1986-2002 by cisco Systems, Inc.
> Compiled Wed 28-Aug-02 10:25 by antonino
> Image text-base: 0x80010000, data-base: 0x80528000
>
> ROM: Bootstrap program is CALHOUN boot loader
>
> Switch uptime is 4 minutes
> System returned to ROM by power-on
> System image file is "flash:c2950-i6q4l2-tar.121-12c.EA1.bin"
>
> cisco WS-C2950G-48-EI (RC32300) processor (revision G0) with 20402K
> bytes of memory.
> Processor board ID FOC0702X04M
> Last reset from system-reset
> Running Enhanced Image
> 40 FastEthernet/IEEE 802.3 interface(s)
> 2 Gigabit Ethernet/IEEE 802.3 interface(s)
>
> 32K bytes of flash-simulated non-volatile configuration memory.
> Base ethernet MAC Address: 00:0B:FD:29:0B:C0
> Motherboard assembly number: 73-7409-11
> Power supply part number: 34-0965-01
> Motherboard serial number: FOC07020350
> Power supply serial number: PHI06480GT8
> Model revision number: G0
> Motherboard revision number: A0
> Model number: WS-C2950G-48-EI
> System serial number: FOC0702X04M
> Configuration register is 0xF
>



 
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farmerc farmerc is offline
Junior Member
Join Date: Nov 2006
Posts: 2
 
      11-07-2007
Strange this,


I have been setting up a few 29 series switches.. One of them had this problem so i sent it back..

New one arrived no issues all works fine.

However, this evening i have been testing some configs on a 2960 and guess what happened when setting up Etherchannel..? Yup post failure on port..

Restart Switch - same issue
Reset Switch - issue gone...


Interesting.
 
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