 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
You must configure OSPF graceful restart before you begin the in-service software upgrade. When the unified ISSU process verifies the upgrade requirements during the initialization phase, it detects whether graceful restart is configured. If it is not configured, the CLI displays a warning message and prompts you to proceed or halt. You can stop at this point to configure graceful restart.
If instead you proceed, the in-service software upgrade can complete successfully, but the OSPF neighbors are likely to break the adjacencies with the upgrading router and consider that routes formerly reached through this router are now unreachable. When the in-service software upgrade completes and the routing protocols restart, the IS-IS neighbors can relearn the routes through the router.
You must also ensure that the OSPF neighbors have been configured as graceful restart helper routers. During the unified ISSU initialization phase, OSPF graceful restart on the upgrading router cannot verify whether its neighbors are helper routers, and reports that fact by means of the CLI.
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |