300-410 Question 85
Select 3A network engineer is configuring a BGP session between two routers to support both IPv4 and IPv6 address families. Which of the following steps are necessary to enable the routers to exchange routing information for both address families?
- A
Enable the BGP IPv4 and IPv6 address families under the BGP configuration.
- B
Establish a separate BGP session for each address family.
- C
Activate the desired address families under the neighbor configuration.
- D
Configure the 'address-family dual-stack' command under the BGP configuration.
- E
Ensure that the neighbor supports the same address families.
Show answer and explanation
Correct answers: A, C, E
Explanation
To exchange routing information for both IPv4 and IPv6 address families in BGP, you must explicitly enable the address families under the BGP process and activate them under the neighbor configuration. Both peers must also support the same address families. It is not necessary to establish separate BGP sessions for each address family, as BGP is designed to handle multiple address families within a single session.
- A. Correct.
Correct: The IPv4 and IPv6 address families must be explicitly enabled under the BGP process to exchange routing information for these protocols.
- B. Incorrect.
Incorrect: Separate BGP sessions are not required for IPv4 and IPv6. BGP supports multiple address families within a single session.
- C. Correct.
Correct: Each address family must be activated under the neighbor configuration to allow the exchange of routing information for those families.
- D. Incorrect.
Incorrect: The 'address-family dual-stack' command is not a valid BGP configuration command. Dual-stack is a deployment model but not a specific BGP configuration option.
- E. Correct.
Correct: Both peers must support and agree on the same address families for routing information to be exchanged successfully.