07-04-2011 04:41 PM - edited 03-07-2019 01:05 AM
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
07-05-2011 01:04 AM
Your devices could be in RPR mode post the output of " show redundancy"
07-05-2011 01:31 AM
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:
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:
Configuration register = 0x2102
07-12-2011 07:07 AM
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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