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Beginner

Multiple Mac Address Flapping on SWITCH

Hi,

Our server switch (10.0.0.249) it is connected with cores switch with portchannel and now its was start broadcasting with three specific mac address.

Gi1/0/31 Gi1/0/7       (X.X.X.5441)

Gi 1/0/27 Gi1/0/19    (X.X.X.56C9)

Gi1/0/31 Gi1/0/32     (X.X.X.5541)

1/0/31  Po 30            (X.X.X.CCd6)

Po 30  1/0/6              (X.X.X.CCd6)

NOW GUIDE ME HOW TO RESOLVE THIS ISSUE WHAT COMMAND I HAVE CONFIGURED WRONG ON PORT CHANNEL

I HAVE ALSO ATTACHED THE LOGS OF SERVER(10.0.0.249) SWITCH WITH CORE SWITCH 3RD FLOOR AND NMS REPORT.

KIND REGARDS,

SALMAN AHMED

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4 REPLIES 4
Beginner

Multiple Mac Address Flapping on SWITCH

Do u Configured Port channel on both side of Switches with same vlan both sides... ........ Mac flap jenarally occurs when there r Multiple Links up ... not blocked by STP..

port Po30 and port Gi1/0/6

Gi1/0/19 and port Gi1/0/36

..... find out..May be loop is There between these 2 uplinks... shut down one of them ......& check what happens..

Beginner

Multiple Mac Address Flapping on SWITCH

What about the others

Gi1/0/31 Gi1/0/7       (X.X.X.5441)

Gi 1/0/27 Gi1/0/19    (X.X.X.56C9)

Gi1/0/31 Gi1/0/32     (X.X.X.5541)

Beginner

Multiple Mac Address Flapping on SWITCH

check out for loop

Engager

Re: Multiple Mac Address Flapping on SWITCH

Please also post the first byte of the mac-addresses to check if the I/G-Bit is set (unicast/multicast) and/or the U/L-Bit (globally unique/local).

Sorry, it's in the log-file.

"02" means locally administered. Talk to the Server-Guys. This might be for redundancy (NIC Teaming) or load sharing.

I found that, maybe it helps:

http://rizzitech.blogspot.de/2008/08/connecting-netapp-fas3020-to-cisco-4948.html

https://supportforums.cisco.com/thread/159479

HTH

Rolf

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