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Graceful Routing Engine Switchover
Graceful Routing Engine switchover (GRES) enables a routing
platform with redundant Routing Engines to continue forwarding packets,
even if one Routing Engine fails. Graceful Routing Engine switchover
preserves interface and kernel information. Traffic is not interrupted.
However, graceful Routing Engine switchover does not preserve the
control plane. Neighboring routers detect that the router has experienced
a restart and react to the event in a manner prescribed by individual
routing protocol specifications. To preserve routing during a switchover,
graceful Routing Engine switchover must be combined with either graceful
restart protocol extensions or nonstop active routing. For more information,
see Graceful Routing Engine Switchover Overview.
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