What are three ways that graceful Routing Engine switchover provides redundancy?
(Choose three.)
A.
by not restarting the PFE
B.
by preserving the control plane information
C.
by preserving interface and kernel information
D.
by preserving the data plane information
E.
by reducing time of RE failover
C, D, E
Graceful Routing Engine switchover (GRES) enables a routing platform with redundant
Routing Engines to continue forwarding packets, even if one Routing Engine fails. GracefulRouting Engine switchover preserves interface and kernel information. T raffic 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.
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A, C, E
With graceful RE switchover enabled, the PFE is not restarted and interface and kernel information is preserved. By allowing the
PFE to remain up during a mastership switchover and preserving interface and kernel information, graceful RE switchover
greatly reduces the time the RE failover process takes.
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A,C,E is correct,
http://www.juniper.net/techpubs/en_US/junos14.1/topics/concept/gres-overview.html
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A,C,E
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