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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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cisco#show debugging OSPF: OSPF hello debugging is on Condition 1: interface Et0/0.10 (1 flags triggered) Flags: Et0/0.10 cisco# *Dec 16 21:16:19.138: OSPF-1 HELLO Et0/0.10: Send hello to 224.0.0.5 area 0 from 192.168.255.3 cisco# *Dec 16 21:16:20.677: OSPF-1 HELLO Et0/0.10: Rcv hello from 192.168.255.2 area 0 192.168.255.2 cisco# *Dec 16 21:16:28.785: OSPF-1 HELLO Et0/0.10: Send hello to 224.0.0.5 area 0 from 192.168.255.3 cisco# *Dec 16 21:16:30.568: OSPF-1 HELLO Et0/0.10: Rcv hello from 192.168.255.2 area 0 192.168.255.2 cisco#
A is correct
debug condition interface Limits output for some debugging commands based on the interfaces. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/debug/command/a1/db-a1-cr-book/db-c1.html