Host Flapping

Unanswered Question
Jul 5th, 2008
User Badges:

I m getting following error in my L# switch. How to rectify the problem.. which leads my network slow..

%C4K_EBM-4-HOSTFLAPPING: Host 02:01:00:00:00:00 in vlan 1 is flapping between port Gi5/2 and port Gi 4/22

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
n.nandrekar Sun, 07/06/2008 - 10:09
User Badges:
  • Silver, 250 points or more


this could mean that the same host mac address frames are being recieved on both the interfaces, pointing to a probable loop in the network.



n.nandrekar Mon, 07/07/2008 - 06:28
User Badges:
  • Silver, 250 points or more

what is the topology connected to both the posts? are those 2 ports indirectly connected through hub/switch?

vinothlb1 Mon, 07/07/2008 - 20:18
User Badges:

Both gigabit ports are connected to L3 switch.

Gi/7 connected to my antivirus server. Gi/14 connected to fileserver.. .There is no load balance..

Pravin Phadte Mon, 07/07/2008 - 06:33
User Badges:
  • Silver, 250 points or more


Plz let us know what is connected to this switch ports.

also the running confg for both would be helpful.



cowetacoit Mon, 07/07/2008 - 09:42
User Badges:

I had a similar problem once. It was a couple servers that had Teamed NIC's. It wasn't configured properly on the broadcom software. If your network is slow it sounds like it could be a network loop.

Pravin Phadte Mon, 07/07/2008 - 09:47
User Badges:
  • Silver, 250 points or more

It can also be possible if the servers connected to the switch ports are set for load balancing.




This Discussion