H12-821_V1.0 · Question #789
The routing message appears when the administrator configures OSPF. The reason is Router-ID conflict.
The correct answer is A. TRUE. Option A is correct because OSPF requires every router in a domain to have a unique Router-ID (typically the highest loopback IP or highest active interface IP). When two routers share the same Router-ID, OSPF detects the conflict during neighbor adjacency formation and…
Question
Options
- ATRUE
- BFALSE
How the community answered
(30 responses)- A83% (25)
- B17% (5)
Explanation
Option A is correct because OSPF requires every router in a domain to have a unique Router-ID (typically the highest loopback IP or highest active interface IP). When two routers share the same Router-ID, OSPF detects the conflict during neighbor adjacency formation and generates a log/warning message alerting the administrator to the duplicate - this is standard OSPF behavior built into the protocol.
Option B is wrong because the conflict notification is not silent; IOS and most network OS implementations actively surface this as a syslog message (e.g., %OSPF-4-DUP_RTRID_NBR) to prevent routing instability caused by ambiguous router identification.
Memory tip: Think of Router-IDs like Social Security Numbers - OSPF won't let two routers share one without loudly complaining. If you see a DUP_RTRID message in OSPF, a duplicate Router-ID is your first suspect.
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