Cisco Catalyst 4506 L3 / Flip Flop

Discussion in 'Cisco' started by Rene Obrecht, Nov 22, 2005.

  1. Rene Obrecht

    Rene Obrecht Guest

    Dear all

    We're running a Cisco Catalyst 4506 Layer 3 Switch, Version 12.1(19).
    Everythings works fine, but all night it changes its visible MAC
    Address (Flip Flop). We have

    here's our Arpwatch message:

    flip flop eth0
    ip address:
    interface: eth0
    ethernet address: 0:e:d7:33:cb:7f
    ethernet vendor: Cisco Systems
    old ethernet address: 0:0:c:33:ef:d3
    old ethernet vendor: Cisco Systems, Inc. [Cisco]
    timestamp: Tuesday, November 22, 2005 1:59:03 +0100
    previous timestamp: Tuesday, November 22, 2005 1:58:58 +0100
    delta: 5 seconds

    What could this be? Is this normal behaviour?

    Rene Obrecht, Nov 22, 2005
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