Cisco Cisco Packet Data Gateway (PDG)
Interchassis Session Recovery
StarOS Updates in an ICSR Configuration ▀
VPC-VSM System Administration Guide, StarOS Release 19 ▄
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Waiting for Session Synchronization
Allow time for session synchronization to occur between the ICSR chassis before preceding to the next steps.
Step 1
Run the show session recovery status verbose command on both chassis. Proceed to the next steps only when no
errors are seen in the output of this command.
errors are seen in the output of this command.
Step 2
On the standby instance, run show srp checkpoint statistics |more.
Step 3
On active instance, run show subs summary |grep Total.
Step 4
Compare the number of subscribers on the active instance and the number of Current pre-allocated calls: on the standby
instance. They should be similar (within 5%). Allow a few minutes for the instances to complete synchronization.
instance. They should be similar (within 5%). Allow a few minutes for the instances to complete synchronization.
Primary Instance
Log into the active primary VPC-VSM instance and complete the tasks described below.
Initiating an SRP Switchover
An SRP switchover places the primary instance in standby mode and makes the backup instance active. The secondary
instance is now processing sessions with the upgraded software.
instance is now processing sessions with the upgraded software.
Step 1
On the primary instance run the srp initiate-switchover command. All existing sessions will be migrated to the backup
chassis and it begins servicing new session requests. Allow the switchover process to complete.
chassis and it begins servicing new session requests. Allow the switchover process to complete.
Step 2
On the primary instance, run the show srp info command. Chassis State should indicate Standby when switchover is
complete.
complete.
Step 3
On the backup instance, confirm the switchover is complete by running the show srp info command. Chassis State
should indicate Active when switchover is complete.
should indicate Active when switchover is complete.
Checking AAA Monitor Status on the Newly Active Instance
If your network deployment requires communication with AAA servers, log into the newly active VPC-VSM instance
and perform an AAA monitor check. You will be checking for the existence of any SNMP traps that indicate the
instance cannot communicate with AAA servers (starSRPAAAUnreachable).
and perform an AAA monitor check. You will be checking for the existence of any SNMP traps that indicate the
instance cannot communicate with AAA servers (starSRPAAAUnreachable).
Step 1
Run the Exec mode command show snmp trap history |grep starSRPAAAUnreachable.
Step 2
There should be no output for this command, or no very recent SNMP trap notifications (based on the event timestamp).
Step 3
If the active chassis cannot communicate with one or more AAA servers, refer to
Completing the Software Update
Log into the standby instance and repeat the following tasks to complete the upgrade process on the standby primary
instance:
instance: