Halting Unified ISSU During Initialization Phase

During the initialization phase, you can halt the unified ISSU process by issuing the issu stop command. This action reloads the redundant SRP module with the armed upgrade release. As a result, unified ISSU is placed in the idle state and the following releases are present on the router:

• Primary SRP module—Running (original) release
• Redundant SRP module—Upgrade release
• Line modules—Running (original) release

After you stop unified ISSU, you can return the router to the state it was in when you began the in-service software upgrade. To roll the router back to its beginning state with the redundant SRP module running the original release, you must perform the following steps to arm the redundant SRP module with the running release:

1. Turn off auto synchronization.

   host1(config)#disable-autosync

2. Specify that the router use the running release when it reboots.

   host1(config)#boot system erx_x-y-z.rel

3. Synchronize the NVS file system of the redundant module with that of the primary module.

   host1#synchronize

   The redundant SRP module automatically reboots because the armed release (the original release) now differs from the software release it is currently running (the upgrade release).

4. Verify that stateful SRP switchover is enabled.

   host1#show redundancy

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