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Loopback Interface down on SUP Switchover in VSS Cluster

j.hoffmann
Level 1
Level 1

I've realized that a configured loopback interface on a VSS Cluster (2x Cat6509 with VS-S720-10G) is going down for a short time on SUP Switchover

caused by

(a) pulling the active SUP

or

(b) CLI command : "redundancy force-switchover"

The loopback interface lo1 is configured as source of syslog messages ("logging source-interface Loopback1").

Because of the interface down a lot of syslog messages are sent with an other source IP as configured on the loopback interface.

Is there a possibility to avoid the down of the loopback interface on SUP switchover?

Thanks for any advice!

Jens

3 Replies 3

andrew.prince
Level 10
Level 10

Your devices could be in RPR mode post the output of " show redundancy"

The cluster is configured with SSO..

VSS-Cluster#sh redundancy

Redundant System Information :

------------------------------

       Available system uptime = 8 weeks, 1 day, 11 hours, 27 minutes

Switchovers system experienced = 17

              Standby failures = 0

        Last switchover reason = active unit removed

                 Hardware Mode = Duplex

    Configured Redundancy Mode = sso

     Operating Redundancy Mode = sso

              Maintenance Mode = Disabled

                Communications = Up

Current Processor Information :

-------------------------------

               Active Location = slot 2/5

        Current Software state = ACTIVE

       Uptime in current state = 1 day, 1 hour, 50 minutes

                 Image Version = Cisco IOS Software,

                          BOOT = sup-bootdisk:,1;

        Configuration register = 0x2102

Peer Processor Information :

----------------------------

              Standby Location = slot 1/5

        Current Software state = STANDBY HOT

       Uptime in current state = 1 day, 1 hour, 43 minutes

                 Image Version = Cisco IOS Software,

                          BOOT = sup-bootdisk:,1;

        Configuration register = 0x2102

The loopback interface is down for about 10 seconds in case of SUP switchover.

Is this a normal behavior or a bug?

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