Which two of the following actions must an OSPF NSF-capable router execute after a supervisor engine switchover?（） (Choose two.)A、Re-learn the available OSPF neighbors with neighbor relationship restartB、Send the graceful restart messageC、Re-acquire the link state database content for the networkD、Re-learn the available OSPF neighbors without neighbor relationship restart
Which two of the following actions must an OSPF NSF-capable router execute after a supervisor engine switchover?（） (Choose two.)
- A、Re-learn the available OSPF neighbors with neighbor relationship restart
- B、Send the graceful restart message
- C、Re-acquire the link state database content for the network
- D、Re-learn the available OSPF neighbors without neighbor relationship restart
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