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300-730 · Question #195
300-730 Question #195: Real Exam Question with Answer & Explanation
The correct answer is C: Configure the correct NHS.. The NHRP output showing req-failed=30 and repl-recv=0 means every registration attempt to the configured NHS failed with no replies, indicating the NHS address is wrong.
Troubleshooting VPNs
Question
Refer to the exhibit. A customer has a DMVPN establishment problem between a hub and a spoke router. To troubleshoot this problem, the network administrator checks the traffic counters of the tunnel and notices that return traffic is not coming back from the other end of the tunnel.
SPOKE#show ip nhrp rhs detail
Legend: Ex-Expeding replies, R=Responding
Total: 10.10.1.1 E rec=30 req=30 req-failed 30 repl-recv 0
Pending Registration Requests:
Registration Request Reqid 4371, Ret 64 NHS 10 10 1 1
Options
- AMake the tunnel source and destination reachable.
- BImplement the NHRP shortcut.
- CConfigure the correct NHS.
- DReplace the network-id.
Explanation
The NHRP output showing req-failed=30 and repl-recv=0 means every registration attempt to the configured NHS failed with no replies, indicating the NHS address is wrong.
Common mistakes.
- A. Basic tunnel reachability is confirmed as a prerequisite by the fact that 30 requests were transmitted; if the tunnel were down, no requests would be sent at all.
- B. NHRP shortcuts facilitate spoke-to-spoke direct paths and have no effect on the spoke-to-hub registration process shown failing in the exhibit.
- D. A mismatched NHRP network-id prevents a spoke from joining the NHRP domain entirely rather than causing selective reply drops against a specific NHS.
Concept tested. NHRP NHS registration failure diagnosis in DMVPN
Topics
#DMVPN#NHRP registration#NHS#req-failed
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