2960G Switch port issue

mkareemashraf · ‎12-13-2009

Dear All,

In our network we are using cisco switch model WS-C2960G-24TC-L. One of the port on switch is unable to receive request.

Before X Server on this port was running fine . We came to known when other port of X server went down and this port couldn't takeup the connectivity .

When we connect other server to this port and want to ping default gateway. The port is not getting response from default gateway.

We tried the following troubleshooting steps:

We connect the laptop and tried to ping the default gateway but no response
Changed the vlan on port still their was noresponse
shutdown / no shutdown on port
checked the configurating /subnet ,duplex , speed on port
paket capture on switch port (request is generated from the port to the default gateway but port is not receiveing any request from deatination other side)
Other ports on same switch are able to receive request from default gateway.
we chage the cable ,no access list etc in between to default gateway.

NOTE: On port we are able to get the server's MAC address , but on show interface output we see port is receiving input packets but no output packets are displayed.

GigabitEthernet0/2 is down, line protocol is down (notconnect)

Hardware is Gigabit Ethernet, address is xxx.xxx.xxx (bia xxx.xxx.xxx) --- able to get mac of server

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:59:22, output hang never

Last clearing of "show interface" counters 01:56:28

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

535 packets input, 36292 bytes, 0 no buffer

Received 535 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

Please can any one help us to solve this problem or this port is damaged .

Your help is highly appreciated.

regards,

M.K

vvasisth · ‎12-13-2009

it could be a possibility tha the port is damaged but the output attached in you questions says there is nothing connected on the port ?

GigabitEthernet0/2 is down, line protocol is down (notconnect) <------- is there something conencted to this port ?

mkareemashraf · ‎12-13-2009

Dear Varun,

Laptop is connected on this port .

Here's the output

GigabitEthernet0/2 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is xxx.1xx.xx (bia xx.xxc.xx2)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters 03:33:16
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     552 packets input, 37380 bytes, 0 no buffer
     Received 552 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
    0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

Thanks for ur quick response

vvasisth · ‎12-13-2009

did you tried connecting this pc to a diff port ?

does that work ?

clear the logs and see if the input and output packets are incrementing

if not then its a faulty port

glen.grant · ‎12-13-2009

Also during a maintenance window or after everyone has gone for the day power cycle the switch and see if it recovers .

Leo Laohoo · ‎12-13-2009

If you say that moving the connection to a different port works then I'm suspecting the ASIC that controls the first 4 ports has failed. What is the result of the "sh post" command?

mkareemashraf · ‎12-14-2009

Thanks for u r response.

I cannot restart the switch because it is in porduction environment.

Even the POST test is successfull

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

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

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

All other ports are working , even i connect the server from port 2 to port 4 ,it is working fine.

vvasisth · ‎12-14-2009

did you tried doing a shut /o shut on the interface ?

mkareemashraf · ‎12-14-2009

Yes We tried shut/no shut on switch port.

vvasisth · ‎12-14-2009

replace the switch

regards,

varun

Lucien Avramov · ‎12-14-2009

Get a maintenance window and power cycle the switch.

Replacing the switch is premature at this point.

Megan Brandenburg · ‎11-04-2011

Hello,

We are experiencing the same issue as described at the top of this discussion. Has a solution been discovered for this issue?

Thank you for your help!

Leo Laohoo · ‎11-04-2011

Hi Megan,

Let's try running a TDR. If your connection is on a Gig port then it's good because this will test all four pairs. Here are the command:

1. Command: test cable tdr interface ;

2. Wait for about 5 to 7 seconds; and

3. Command: show cable tdr interface

Please post the output.

This test will determine if you have a Layer 1 issue.