Cisco Systems Local Director 415
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Subject Author Date
Local Director 415 RED 11-27-06
`--> Re: Local Director 415 www.BradReese.C...11-28-06
Posted by RED on November 27, 2006, 10:02 am
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Has anyone seen %C4K_EBM-4-HOSTFLAPPING: with Loacal Director?

I have two 415s in LAN failover that were working well on a WS-C4002
that I moved to a 4507R and they are still working well.

There are two PIX 520s in failover on the same switch.

The new switch has log entries that indicate a problem with the
firewall.  I have failed the LD and the PIX to the standby units but
the entries persist.

Nov 25 02:41:15: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 02:41:30: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 03:40:08: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 03:40:26: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 04:39:42: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 04:40:00: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 05:40:44: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 05:40:59: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 06:40:59: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 06:41:14: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 07:40:59: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 07:41:14: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 08:40:43: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 08:40:58: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 09:40:29: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 09:40:44: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 10:40:40: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29
Nov 25 10:40:58: %C4K_EBM-4-HOSTFLAPPING: Host 00:E0:B6:00:D6:D6 in
vlan 150 is flapping between port Gi4/42 and port Gi3/29


Posted by www.BradReese.Com on November 28, 2006, 12:14 am
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Hi Robert,

%C4K_EBM-4-HOSTFLAPPING: Host [mac-addr] in vlan [dec] is flapping
between port [char] and port [char]

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.

Cisco's 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.

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_tech_note09186a008063c36f.shtml#ts

Hope this helps.

Brad Reese
http://www.BradReese.Com


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