300-440 Question 53
Single answerA network engineer is configuring BGP on a router to support both IPv4 and IPv6 address families. Which command must be used to activate BGP for the IPv6 address family on the router?
- A
address-family ipv6 unicast
- B
neighbor [IPv6-address] activate
- C
network [IPv6-prefix] mask [mask]
- D
bgp log-neighbor-changes
Show answer and explanation
Correct answer: A
Explanation
To support IPv6 in BGP, the 'address-family ipv6 unicast' command must be used under the BGP configuration mode. This command enables BGP to process IPv6 unicast routes. Other commands like 'neighbor [IPv6-address] activate' and 'network [IPv6-prefix] mask [mask]' are used for specific configurations within the IPv6 address family but do not activate it.
- A. Correct.
This is the correct command to activate the IPv6 address family in BGP. It defines the IPv6 unicast address family within the BGP configuration and allows the router to process IPv6 routes.
- B. Incorrect.
This command is used to activate a specific neighbor for the IPv6 address family after the address-family is defined. However, it does not activate the address family itself.
- C. Incorrect.
This command is used to advertise a specific IPv6 route in the BGP routing table, but it does not activate the IPv6 address family.
- D. Incorrect.
This command enables logging for neighbor changes in BGP, but it is not related to activating the IPv6 address family.