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Cisco SVI Shutting down

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  • Cisco SVI Shutting down


    We have a strange problem on a Cisco 3550.

    We have an 802.1Q Trunk from the Cisco connecting to an Extreme Networks Summit X450a. The 802.1Q VLANs route through the Extreme network and to another Cisco 3550 at the opposite side.

    Cisco 3550 - 802.1Q --> Extreme --> 802.1Q --> Cisco 3550

    On each Cisco, there are a number of SVIs running an instance of OSPF. Traffic forwards fine, OSPF functions fine and generally everything works great.

    Every so often - the OSPF dies and the SVI shuts down, and comes back up again later.

    Jan 27 13:37:01: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan500, changed state to down
    Jan 27 13:37:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan500, changed state to up

    The Trunk port remains up at all times and the err-disabled state remains clear. My understanding was an SVI VLAN interface can only shutdown if the actual VLAN is removed from the switch, administratively shutdown, or no active ports with that VLAN are present - none of these apply.

    Anyone have any ideas why an SVI would shutdown in these circumstances?


  • #2
    Re: Cisco SVI Shutting down

    did u see log in switch..what it shows???