350-401 Question 426
Single answerA network engineer is configuring BGP on a dual-stack router to support both IPv4 and IPv6 address families. Which command must be used to activate the IPv6 address family in the BGP configuration?
- A
address-family ipv6 unicast
- B
ipv6 enable
- C
neighbor
activate - D
address-family ipv6 multicast
Show answer and explanation
Correct answer: A
Explanation
In BGP, address families must be explicitly activated to support the desired routing protocols and address types. The 'address-family ipv6 unicast' command activates the IPv6 unicast address family, which is essential for exchanging IPv6 unicast routes with BGP neighbors. Other commands are either unrelated to the activation of IPv6 unicast in BGP or address a different use case.
- A. Correct.
This is the correct command to activate the IPv6 unicast address family in BGP. It ensures that the router can exchange IPv6 unicast routes with its BGP neighbors.
- B. Incorrect.
This command enables IPv6 at the interface level but does not activate the IPv6 address family in BGP.
- C. Incorrect.
This command activates a specific BGP neighbor for the IPv6 address family, but it requires the address family to already be configured.
- D. Incorrect.
This command activates the IPv6 multicast address family, not the unicast address family required in this scenario.