%C4K_EBM-CLUSTER_MEMBER

Answered Question
Apr 29th, 2008
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Can anyone tell me what is it messages in console %C4K_EBM-CLUSTER_MEMBER_14-4-HOSTFLAPPING: Host 02:01:00:00:00:00 in vlan 150 is flapping .


I have this:


------------------ show version ------------------


Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I9S-M), Version 12.2(25)EW, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2004 by Cisco Systems, Inc.

Compiled Fri 10-Dec-04 14:26 by kellythw


ROM: 12.2(20r)EW1

Dagobah Revision 95, Swamp Revision 6


8901SW254 uptime is 1 year, 25 weeks, 3 days, 1 hour, 32 minutes

Uptime for this control processor is 1 year, 25 weeks, 3 days, 1 hour, 32 minutes

System returned to ROM by power-on

System restarted at 10:22:00 UTC Thu Nov 2 2006

System image file is "bootflash:"


cisco WS-C4507R (MPC8245) processor (revision 8) with 524288K bytes of memory.

Processor board ID FOX0851021H

MPC8245 CPU at 400Mhz, Supervisor V

Last reset from PowerUp

8 Virtual Ethernet interfaces

58 Gigabit Ethernet interfaces

511K bytes of non-volatile configuration memory.


Configuration register is 0x2101



Chassis Type : WS-C4507R


Power consumed by backplane : 40 Watts


Mod Ports Card Type Model Serial No.

---+-----+--------------------------------------+------------------+-----------

1 2 Supervisor V 1000BaseX (GBIC) WS-X4516 JAB0905024M

2 2 Supervisor V 1000BaseX (GBIC) WS-X4516 JAB090604EF

3 24 10/100/1000BaseT (RJ45) WS-X4424-GB-RJ45 JAE084501JM

4 24 10/100/1000BaseT (RJ45) WS-X4424-GB-RJ45 JAE08501ZAQ

5 6 1000BaseX (GBIC) WS-X4306-GB JAE1123KT0L


M MAC addresses Hw Fw Sw Status

--+--------------------------------+---+------------+----------------+---------

1 0013.1a1f.3b00 to 0013.1a1f.3b01 2.0 12.2(20r)EW1 12.2(25)EW Ok

2 0013.1a1f.3b02 to 0013.1a1f.3b03 2.0 12.2(20r)EW1 12.2(25)EW, Ok

3 0012.01f1.97e0 to 0012.01f1.97f7 1.6 Ok

4 0012.01f1.ccc0 to 0012.01f1.ccd7 1.6 Ok

5 000e.83a1.c4e8 to 000e.83a1.c4ed 4.3 Ok



Correct Answer by Sushil Kumar Katre about 9 years 1 month ago

HI,


This error message appears on the switch when the switch detects the specified host address as a source address on multiple ports.


Cause

The issue can occur due to Spanning Tree Protocol (STP) loops in the network that cause packet drops from the specific host. In addition to packet drops, STP loops lead to several other symptoms, which are listed here:


Loss of connectivity to, from, and through affected network regions.


High link utilization (often 100 percent).


High switch backplane utilization (compared to the baseline utilization).


Syslog messages that indicate packet looping in the network (for example, HSRP duplicate IP address messages).


Syslog messages that indicate constant address relearning or MAC address flapping messages.


An increase in the number of output drops on many interfaces.


-> Sushil

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Correct Answer
Sushil Kumar Katre Wed, 04/30/2008 - 05:24
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HI,


This error message appears on the switch when the switch detects the specified host address as a source address on multiple ports.


Cause

The issue can occur due to Spanning Tree Protocol (STP) loops in the network that cause packet drops from the specific host. In addition to packet drops, STP loops lead to several other symptoms, which are listed here:


Loss of connectivity to, from, and through affected network regions.


High link utilization (often 100 percent).


High switch backplane utilization (compared to the baseline utilization).


Syslog messages that indicate packet looping in the network (for example, HSRP duplicate IP address messages).


Syslog messages that indicate constant address relearning or MAC address flapping messages.


An increase in the number of output drops on many interfaces.


-> Sushil

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