CAT 4000 - %SYS-4-P2_WARN: 1/Protocol Packet (is not present on

Unanswered Question
Jul 20th, 2007
User Badges:


on a switch CAT 4000 , I HAVE this error:

2007 Jul 20 11:37:59 %SYS-4-P2_WARN: 1/Protocol Packet DA=00:02:44:b1:8f:f2 SA=aa:00:04:00:fb:17 arrived on unexpected port 5/30 cnt 2115

The port 5/30 is disabled.

I don't find this error on

Can you help me?



  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
royalblues Fri, 07/20/2007 - 02:27
User Badges:
  • Green, 3000 points or more

Though the above error is not seen in under the common %SYS-4-P2_WARN messages, it seems that a switch detected a loop and disabled the port.

How often are you seeing this Error? The SA is a DEC system. do use the same error if you move the source to another port?


fcostalunga Fri, 07/20/2007 - 02:34
User Badges:

but , in this case , i don't understand the troubleshoothing that i can to do for to resolve my problem.

Can you have a link of this argument on

Thanks for your help


royalblues Fri, 07/20/2007 - 02:42
User Badges:
  • Green, 3000 points or more

check the SA address in the CAM to see at what port it learns the address.

Is this being learnt at some other port rather than the one mentioned in the log...

fcostalunga Fri, 07/20/2007 - 03:01
User Badges:

i've search the 6 mac-address the i find in the log.

I find the 6 (six) port on this mac-address is connected.

the port is 6/40 , 6/43 , 2/40 , 2/39 , 2/42 , 5/6.

What can i do?

I can create an a VACL , or simply i disable this port?



Amit Singh Fri, 07/20/2007 - 09:54
User Badges:
  • Cisco Employee,


I would like to check the complete logs for the errors that you are getting. Are you getting some "Astro timeout" errors as well. There have been a lots of bug associated with the kind of errors that you are getting and just want to be sure before getting onto this. Please sned me the complete logs.

HTH,Please rate if it does.

-amit singh


This Discussion