JN0-349 · Question #28
Which two requirements must be satisfied before graceful restart work? [Choose two)
The correct answer is A. a stable network topology C. a neighbor configured with graceful restart. The primary drawback to GR is the need for protocol extensions and helper support in neighboring routers, and a stable network topology. If any neighbors do not support GR, or if other changes occur in the network, GR ends up aborting and loss results in the dataplane. Even…
Question
Which two requirements must be satisfied before graceful restart work? [Choose two)
Options
- Aa stable network topology
- Ba neighbor configured with BfD
- Ca neighbor configured with graceful restart
- Da neighbors with an uptime greater than an hour
How the community answered
(27 responses)- A81% (22)
- B7% (2)
- D11% (3)
Explanation
The primary drawback to GR is the need for protocol extensions and helper support in neighboring routers, and a stable network topology. If any neighbors do not support GR, or if other changes occur in the network, GR ends up aborting and loss results in the dataplane. Even when all goes to plan and the GR event succeeds, which means there is zero loss in the data plane, there is still control plane flap and a subsequent need for protocol reconvergence between the restarting router and its helpers.
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