08-28-2007 05:15 AM - edited 03-05-2019 06:08 PM
Hello,
I am having C4507 switch. In that I seeing an error saying
Aug 28 13:06:09.787: %C4K_EBM-4-HOSTFLAPPING: Host 00:03:BA:DB:D0:EF in vlan 20
is flapping between port Gi4/30 and port Po30
I have searched in Cisco site and I found no work around. As I am getting this error approx once for a minute can some one please help me to fix this.
Highly appriciated if someone can help asap.
Thanks
08-28-2007 05:45 AM
Hi,
%C4K_EBM-4-HOSTFLAPPING: Host [mac-addr] in vlan [dec] is flapping between port [char] and
port [char]
Points that the specified host is detected as a source address on multiple ports.
Typically, a host is supposed to be learned on only one port. A spanning tree loop is the
most common cause of this condition. All traffic from the specified host is temporarily
dropped. After 15 seconds, forwarding is reenabled. If the problem persists, the traffic from the problem host continues to be dropped indefinitely.
Recommended Action: Make sure that spanning tree is enabled to prevent spanning tree
loops. If you have spanning tree disabled, make sure that you have no spanning tree loops
in your network.
Regards,
~JG
08-28-2007 05:50 AM
Hi
Thanks for your reply.
I have checked the Spanning Tree which is running. Still I am getting the same error.
08-28-2007 06:17 AM
What is connected on these ports ?
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: