300-730 · Question #197
Which state indicates that BFD is missing on a peer when troubleshooting DMVPN?
The correct answer is B. NONE(N). In Cisco DMVPN with BFD integration, the NHRP peer BFD state NONE(N) indicates BFD is not configured or not running on that peer.
Question
Options
- ADOWN(D)
- BNONE(N)
- CUP(U)
- DINVALID(I)
How the community answered
(48 responses)- A2% (1)
- B92% (44)
- C4% (2)
- D2% (1)
Why each option
In Cisco DMVPN with BFD integration, the NHRP peer BFD state NONE(N) indicates BFD is not configured or not running on that peer.
DOWN(D) indicates BFD is configured on both peers but the session has detected the peer as currently unreachable or the keepalive has timed out.
When a DMVPN hub has BFD enabled but a spoke peer has no BFD session configured, the hub's NHRP table marks that peer with the state NONE(N), explicitly distinguishing a missing BFD configuration from an operationally failed or active session. This state helps administrators quickly identify which peers need BFD configured rather than those whose sessions have failed.
UP(U) indicates a fully operational BFD session where the peer is confirmed reachable through active BFD hello exchanges.
INVALID(I) is not a defined BFD peer state in Cisco DMVPN NHRP output and does not represent any recognized BFD operational condition.
Concept tested: BFD peer state NONE in DMVPN NHRP table
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nhrp/configuration/xe-16/nhrp-xe-16-book/cfg-nhrp-dmvpn.html
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