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Beginner

Port unresponsive

Hi,

Has anybody ever seen a issue which an access port becomes unresponsive (meaning my PC gets a 169.xx.xx.xx IP address).  I created a spanning port and no data comes in or out of the port.  The shut / no shut has no effect.  The only way is to reboot the switch.

If this was a one switch issue, I would replace it.  However, I have other switches in other sites that have similar behaviour.   I haven't noticed any apparent pattern, The port number and the time is random.  I opened a TAC with Cisco, but haven't heard from them yet.  I was curious if anybody else ever experienced this problem.

Thanks !

6 REPLIES 6
Enthusiast

Re: Port unresponsive

So you made the port a destination using the "monitor session" command?  If so, you can't also use it as an access port.

Highlighted
Beginner

Re: Port unresponsive

Hi jmunoz19 ,

I configured the unresponsive port as the source and other as destination.  I saw no packets coming in or out. 

Have you ever seen that ??

Thanks !

Highlighted
Advisor

Re: Port unresponsive

Hi,

I configured the unresponsive port as the source and other as destination.  I saw no packets coming in or out. 

If the port is errdisabled then this is normal. Is the LED amber when you don't get IP anymore?

Can you post sh run int X /X as well as sh int X/X  status when problem arises.

Regards.

Alain.

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Beginner

Re: Port unresponsive

Hi cadetalain ,

Here's the information you requested.  The port is presently down because we had to move the PC on another port.  The port is not in errdisable mode when the PC is connected. Also, the LED turns green when the PC is connected.

switch1# sh int fa0/6
FastEthernet0/6 is down, line protocol is down (notconnect)
  Hardware is Fast Ethernet, address is 000a.f4a3.6b46 (bia 000a.f4a3.6b46)
  Description: ip 169
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 254/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto-speed, media type is 100BaseTX
  input flow-control is unsupported output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 5d08h, output hang never
  Last clearing of "show interface" counters never
  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
     1484822 packets input, 501863819 bytes, 0 no buffer
     Received 14473 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     4798153 packets output, 1603248947 bytes, 0 underruns
     0 output errors, 0 collisions, 142 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

switch1#sh running-config int fa0/6
Building configuration...

Current configuration : 219 bytes
!
interface FastEthernet0/6
description ip 169
switchport access vlan 204
switchport mode access
no logging event link-status
snmp trap mac-notification added
no snmp trap link-status
spanning-tree portfast
end

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Advisor

Re: Port unresponsive

Hi,

Can you sniff  on host while renewing dhcp lease and at same time SPAN the traffic to other port.

Post the 2 capture files here and if the dhcp server is a cisco router then do a  debug ip dhcp server event and debug ip dhcp server packet

at the same time.

Regards.

alain.

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Beginner

Re: Port unresponsive

Hi,

Sorry for the delay.  It's a remote site. I couldn't get there on the

same day.

i'm attaching the files from both Core switch.  The MAC is 18a9.05e2.6bd0.

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