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Spaning tree loops when I use multicast address

Unanswered Question
Nov 4th, 2003
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Hi all,

I have a loops in spanning tree when I use the VRPP Protocol ( standard of HSRP) in my networks.I use two catalyst 4507R with IOS Version 12.1(19)E. I receive the following message:

2:46.626: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:28 in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:46.626: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:32 in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:46.626: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:3C in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:46.638: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:46 in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:46.638: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:51 in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:46.638: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:0A in vlan 3 is flapping between port Fa4/48 and port Po1

Jun 5 13:12:46.638: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:14 in vlan 3 is flapping between port Fa4/48 and port Po1

Jun 5 13:12:46.638: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:1E in vlan 3 is flapping between port Fa4/48 and port Po1

Jun 5 13:12:46.642: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:50 in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:46.642: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:52 in vlan 3 is flapping between port Po1 and port Fa4/48

Jun 5 13:12:47.306: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:02 in vlan 10 is flapping between port Fa3/48 and port Po1

Jun 5 13:12:58.630: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:5E:00:01:02 in vlan 10 is flapping between port Po1 and port Fa3/4

Thanks in advance

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umedryk Mon, 11/10/2003 - 08:55
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The specified host is detected as a source address on multiple ports. Normally, a host is supposed to be learned on only one port. As you mentioned, cause of this condition is spanning tree loops. All traffic from the specified host is temporarily dropped. After some time, typically 15 to 20 seconds, forwarding is reenabled. If the problem persists, the traffic from the problem host will continue to be dropped indefinitely.


More more information, you can check this link :

http://www.cisco.com/en/US/partner/products/hw/switches/ps663/products_tech_note09186a00801434de.sht



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