 | Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
Nonstop active routing and graceful restart are two different methods of maintaining high availability. Graceful restart requires a restart process. A router undergoing a graceful restart relies on its neighbors (or helpers) to restore its routing protocol information. The restart is the mechanism by which helpers are signaled to exit the wait interval and start providing routing information to the restarting router.
In contrast, nonstop active routing does not involve a router restart. Both the master and standby Routing Engines are running the routing protocol process (rpd) and exchanging updates with neighbors. When one Routing Engine fails, the router simply switches to the active Routing Engine to exchange routing information with neighbors. Because of these feature differences, nonstop routing and graceful restart are mutually exclusive. Nonstop active routing cannot be enabled when the router is configured as a graceful restarting router. If you include the graceful-restart statement at any hierarchy level and the nonstop-routing statement at the [edit routing-options] hierarchy level and try to commit the configuration, the commit request fails.
| Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |