Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 267

A remote operation center is deploying a set of I-BGP and E-BGP connections for multiple IOS-XR platforms using the same template. The I-BGP sessions exchange prefixes with no apparent issues, but the E-BGP sessions do not exchange routes. What causes this issue?

Answer options

• A. The I-BGP neighbors are mistyped and HELLO packets cannot be exchanged successfully between routers.
• B. The E-BGP neighbors are not allowed to exchange Information due to the customer platform's default policy.
• C. A PASS ALL policy has not been implemented for the I-BGP neighbors.
• D. The next-hop-self command is not implemented on both E-BGP neighbors.

Correct answer: B

Explanation

The correct answer is B because E-BGP neighbors may have restrictions based on the default policy that prevents route exchanges. Option A is incorrect as it pertains to I-BGP sessions, and options C and D do not address the specific issue of E-BGP route exchanges.