300-510 SPRI: Implementing Cisco Service Provider Advanced Routing SolutionsDemo

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QuestionQ66

Routing Policy and Manipulation

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Refer to the exhibit. P1 and PE3 are directly connected Cisco IOS XR routers with this configuration applied. The BGP session does not establish. Assume there is no IP-reachability issue and that both routers can open TCP port 179 to one another. Which action resolves the issue?

  • A Change HMAC-MD5 to HMAC-SHA1-20
  • B Configure the send and accept lifetime under key 1
  • C Change HMAC-MD5 to MD5
  • D Change HMAC-MD5 to HMAC-SHA1-12
Explanation

Cisco IOS XR BGP TCP Authentication Option keychains require an active key with both send-lifetime and accept-lifetime configured. The two lifetime values must be identical; otherwise, the key is invalid. Configuring these lifetimes under key 1 on both peers makes the shared authentication key usable and allows the BGP session to establish.

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