3750 gigabit ports not working

[Andy Johnson]

Hi guys,

I have two switches, WS-3750-24PS-S connected in two cabs via fibre.

Patch panels at both ends with patch leads. Used tester to confirm end to end fibre connectivity.

When plugged in, one switch llights up the other does nothing.

Ports are as follows:

interface GigabitEthernet1/0/2

switchport trunk encapsulation dot1q

switchport mode trunk

same at both ends.

Tried both gi ports same result.

swapped transceivers over and the same result, (one switch lit one not - the same switch in both cases).

put both trasceivers in each switch, (gi0/1-0/2 in a single switch). on the one that lights up in the original scenario we get link on both ports and they come up, on the other nothing happens.

shut down both ports on the malfunctioning switch and no shut them, no change.

Show transceivers doesnt show transceivers on the malfunctioning switch, and no attempt is made to bring the ports up if the fibre is removed and replaced.

it is almost as though the two gb ports are kaput...

Anything else I can try?

[Reza Sharifi]

Hi,

Try crossing the fiber strands on one side of the link. It maybe you are connecting tx to tx instead of tx to rx.

HTH

[Andy Johnson]

All the fibre has checked out, I am guessing that it is layer one at the switch itself...

[Leo Laohoo]

Post the output to the command "sh post".

[Andy Johnson]

Hi Leo,

switch was at a site a couple of hundred miles from me...

got it coming back, so will check it on return although I programmed the switch up on the bench here and followed the POST during testing and didnt see any errors...

Will update you tomorrow...

[bpascault]

Hi,

What type of SFP is it ? => http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#wp150398

Post a "show inventory" and "show log".

[Andy Johnson]

Hi there bpascault,

log and post below:

User Access Verification

Password:
63177>en
Password:
63177#sho post
Stored system POST messages:

Switch 1
---------

POST: CPU MIC register Tests : Begin
POST: CPU MIC register Tests : End, Status Passed

POST: PortASIC Memory Tests : Begin
POST: PortASIC Memory Tests : End, Status Passed

POST: CPU MIC interface Loopback Tests : Begin
POST: CPU MIC interface Loopback Tests : End, Status Passed

POST: PortASIC RingLoopback Tests : Begin
POST: PortASIC RingLoopback Tests : End, Status Passed

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Failed

POST: PortASIC CAM Subsystem Tests : Begin
POST: PortASIC CAM Subsystem Tests : End, Status Passed

POST: PortASIC Port Loopback Tests : Begin
POST: PortASIC Port Loopback Tests : End, Status Passed

63177#show log
Syslog logging: enabled (0 messages dropped, 1 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled)
    Console logging: level debugging, 13 messages logged, xml disabled,
                     filtering disabled
    Monitor logging: level debugging, 0 messages logged, xml disabled,
                     filtering disabled
    Buffer logging: level debugging, 13 messages logged, xml disabled,
                    filtering disabled
    Exception Logging: size (4096 bytes)
    Count and timestamp logging messages: disabled
    File logging: disabled
    Trap logging: level informational, 16 message lines logged

Log Buffer (4096 bytes):

00:00:23: %STACKMGR-4-SWITCH_ADDED: Switch 1 has been ADDED to the stack
00:00:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
00:00:25: %SPANTREE-5-EXTENDED_SYSID: Extended SysId enabled for type vlan
00:00:27: %SYS-5-CONFIG_I: Configured from memory by console
00:00:28: %STACKMGR-5-SWITCH_READY: Switch 1 is READY
00:00:28: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 1 has changed to state DOWN
00:00:28: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
00:00:28: %STACKMGR-5-MASTER_READY: Master Switch 1 is READY
00:00:28: %SYS-5-RESTART: System restarted --
Cisco IOS Software, C3750 Software (C3750-IPBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Thu 19-Jul-07 19:15 by nachen
00:00:29: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively down
00:01:43: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to up
00:01:44: %LINK-3-UPDOWN: Interface FastEthernet1/0/1, changed state to up
00:01:45: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet1/0/1, changed state to up
63177#

transceivers are both glc-lh-sm

[Andy Johnson]

and show inventory is as follows:

Non Working Switch

63177#sho invent
NAME: "1", DESCR: "WS-C3750-24P"
PID: WS-C3750-24PS-S   , VID: V06, SN: FDO1224X2PG

Working Switch

63461#sh inv
NAME: "1", DESCR: "WS-C3750-24P"
PID: WS-C3750-24PS-S   , VID: V06, SN: FDO1245Y1KQ

NAME: "GigabitEthernet1/0/1", DESCR: "1000BaseLX SFP"
PID:                     , VID:     , SN: AGC1652V3MU

63461#

[Andy Johnson]

Hi Leo,

Yeah. spotted that when I started going through it... sure it wasnt there when I configured it on the bench as I paid particular attention to the POSTs due to having removed a stack configuration.

Thanks for the assist, dude: kudos!!!!

[Leo Laohoo]

Thanks for taking the time to mark this thread as "Answered", Andy.

[Leo Laohoo · Accepted solution]

POST: Inline Power Controller Tests : Begin
POST: Inline Power Controller Tests : End, Status Failed

Your switch is dead/dying.  Contact Cisco TAC and get the applliance replaced.

[Parvesh Paliwal]

Do we have some spare transreceivers?

[Andy Johnson]

Hi Parvesh,

the previous testing confirmed the SFPs were ok, given the POST failure yes this switch is kaput!

Just one of those things: always happens when the kit is the other side of the country