GRES (Graceful Routing Engine Switchover) est une fonctionnalité qui permet une transition transparente entre les unités de traitement de routage (RE, Routing Engine) sans interruption du service. Elle est souvent utilisée dans les configurations où la haute disponibilité est requise. Cependant, GRES seul n'est pas suffisant pour maintenir l'état de routage sans interruption, et il est généralement combiné avec NSR (Non-Stop Routing).
GRES and Non-Stop Routing (NSR) together ensure that routing information is preserved and that the new master Routing Engine (RE) does not need to restart the routing protocol daemon (rpd). This combination allows for a seamless failover process without disrupting network operations.
The correct statement regarding graceful Routing Engine switchover (GRES) is:
C. When combined with NSR, routing is preserved and the new master RE does not restart rpd.
This combination of Graceful Routing Engine Switchover (GRES) with Nonstop Routing (NSR) helps in preserving routing information and ensures that the new master Routing Engine (RE) does not have to restart the Routing Protocol Daemon (RPD).
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