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New Member

Fastethernet interface on 2600 hang

hi guys

i am facing problem with fastethernet interface of 2600 series router some time it show interface is up and line protocol is also up but i can't ping to other directly connected neighbor. i am attaching show interface output for the same

Please advice what i can do. if you want any more information more than this please let me know

FastEthernet0/1 is up, line protocol is up

Hardware is AmdFE, address is 0013.191f.7241 (bia 0013.191f.7241)

Internet address is

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Half-duplex, 100Mb/s, 100BaseTX/FX

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

Last input 00:00:10, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:00:04

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 118000 bits/sec, 22 packets/sec

5 minute output rate 28000 bits/sec, 22 packets/sec

172 packets input, 131148 bytes

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

73 input errors, 0 CRC, 0 frame, 0 overrun, 73 ignored

0 watchdog

0 input packets with dribble condition detected

176 packets output, 18220 bytes, 0 underruns

0 output errors, 2 collisions, 0 interface resets

0 babbles, 0 late collision, 20 deferred

0 lost carrier, 0 no carrier

0 output buffer failures, 0 output buffers swapped out


Re: Fastethernet interface on 2600 hang


Please can you confirm what the directly connected neighbour is, and the configs of both sides of the link?



New Member

Re: Fastethernet interface on 2600 hang

So the directly connected neighbor should have these ip settings: Correct?

New Member

Re: Fastethernet interface on 2600 hang


Thanks to both of you.

You both are correct and directly connected device is a cisco router.

Thanks in advance

Kamlesh Sharma

Re: Fastethernet interface on 2600 hang


I had the same problem few days back. My 2621 was behaving abnormally and after few minutes it stopped responding to the ping . I had to reboot the router in order to get the connection back. Its was supected either a hardware problem or the software problem. I upgraded the router IOS and everything is fine and its working perfectly. I would suggest to try upgrading the IOS and it should take care of any cosmetic issue if we dont have a hardware problem. :-))


-amit singh

New Member

Re: Fastethernet interface on 2600 hang

Hi Amit,

Thanks for your reply.

Recently we have upgraded our IOS to Version 12.3(2)T6 release fc1 but still we are facing problem.

One more thing as you said you power cycled your router but in my case when i do inter shut and no shut than also it start working but again after some time it hangs.

Please advice if you something more in your mind.

Thanks in advance

Kamlesh Sharma

Re: Fastethernet interface on 2600 hang

Kamlesh, You are able to do shut and no shut the interface as you can reach the router. In my case I was unable to reach it so I had to reload it. Do you have any other free interface on the router. try to change your interface and it will clear us about the bad hardware. Did you face the same problem before the IOS upgrade. It could be some cosmetic issue in the IOS you are running.

Try changing the port on the router and see if that follows you. If not could be the problem in the hardware.


-amit singh

New Member

Re: Fastethernet interface on 2600 hang

Hi Amit,

Thanks for your reply.

Yes we had different problem before upgradation it was restarting the router not only interface goes hang.

We have changed the duplex settings now it is not showing any ignore and collision error but still we have to monitor it for some more time

Thanks in Advance

Kamlesh Sharma