12-13-2009 01:21 AM - edited 03-06-2019 08:55 AM
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:
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
12-13-2009 02:46 AM
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 ?
12-13-2009 03:24 AM
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
12-13-2009 03:31 AM
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
12-13-2009 03:40 AM
Also during a maintenance window or after everyone has gone for the day power cycle the switch and see if it recovers .
12-13-2009 03:55 AM
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?
12-14-2009 12:46 AM
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.
12-14-2009 12:48 AM
did you tried doing a shut /o shut on the interface ?
12-14-2009 02:13 AM
Yes We tried shut/no shut on switch port.
12-14-2009 02:16 AM
replace the switch
regards,
varun
12-14-2009 03:17 AM
Get a maintenance window and power cycle the switch.
Replacing the switch is premature at this point.
11-04-2011 03:21 PM
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!
11-04-2011 04:38 PM
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.
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