Re: Catalyst 2950: front-end loopback test

Discussion in 'Cisco' started by Brian, Jul 7, 2003.

  1. Brian

    Brian Guest

    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" <-aachen.de> wrote in message
    news:bebj8f$oa5$-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/hw/switches/ps607/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 2950-48).
    > 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 41-48) 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. State:Disabled
    >
    > 00:00:17: POST: Loop back Test Failed on FastEthernet0/42. State:Disabled
    >
    > 00:00:17: POST: Loop back Test Failed on FastEthernet0/43. State:Disabled
    >
    > 00:00:17: POST: Loop back Test Failed on FastEthernet0/44.
    > State:Disabled
    >
    > [...]
    >
    > 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
    >
    Brian, Jul 7, 2003
    #1
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  2. Brian

    farmerc

    Joined:
    Nov 20, 2006
    Messages:
    2
    can't be brought up because it failed POST in loopback test

    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.
    farmerc, Nov 7, 2007
    #2
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