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MAC Flapping
Hi teammate,
Thanks for the responds, now it’s clear. 
Yes, there’s a loop since I do all the 3 port-channels (to other 3 switches) in 1 switch first before I move to other switches.
The solution is: I creating one by one (from this side and then go to other side directly connected and back over and over again though all switches).
After creating port-channel in one side, go quick creating port-channel to other side or you will get MACFlap notification like previous I post.
Hmm.. a little bit not efficient that Cisco had made time but it’s fine since we’re already know the solution. Thank you very much for the responds. I appreciate. Regards, Moses
—– Original Message —- From: Patrick Galligan To: Moses Polalysa Sent: Tuesday, March 25, 2008 8:03:27 AM Subject: Re: Weird problem: MAC Flapping
You are getting a loop, because one end has the port channel set and the other does not. If you force the ports to be an etherchannel you should fix it (channel-group 1 mode on). If you need to allow it to negotiate because of the task requirements, you’ll have to work out why the negotiation is failing.
To check the etherchannel status on each switch: show ether summ
If you are doing this through a dot1q tunnel, you need to enable LACP through an L2 protocol tunnel as well. I think the command is: l2protocol-tunnel lacp
HTH
Cheers, Patrick
On Tue, Mar 25, 2008 at 10:23 AM, Moses Polalysa wrote: > Hi expert, > > I have a weird problem. I’m trying to create port-channel to to all directly 4 switches, when I add the ports into port-channel suddenly there is an error like this. > > 01:50:14: %SW_MATM-4-MACFLAP_NOTIF: Host 0030.9432.a420 in vlan 15 is flapping between port Fa0/24 and port Fa0/23 > > Anyone can explain? What should I do? I tried many ways to creating the port-channel but the output is still same. > > Thanks in advance. > > > Regards, > Moses > > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html >
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