350-401 Question 389
Select 3You are configuring a network that uses both IPv4 and IPv6 address families. To optimize routing exchange between routers, you decide to implement BGP with address family support. Which of the following address-family configuration steps must be performed to ensure proper routing for both IPv4 and IPv6?
- A
Configure separate BGP address-family sessions for IPv4 and IPv6 under the BGP process.
- B
Enable dual-stack mode on all interfaces to support both IPv4 and IPv6.
- C
Activate the IPv4 and IPv6 address-family under the BGP neighbor configuration.
- D
Configure a single BGP session for both IPv4 and IPv6 using the same address-family.
- E
Define network statements for both IPv4 and IPv6 under their respective address-families.
Show answer and explanation
Correct answers: A, C, E
Explanation
When configuring BGP to support both IPv4 and IPv6, separate address-family sessions need to be defined for each protocol. Each neighbor must activate the respective address-family to exchange routes. Additionally, network statements must be configured for route advertisement under each address-family. Dual-stack mode and single-session BGP cannot fulfill these requirements for proper routing.
- A. Correct.
Correct: BGP requires separate address-family configuration for IPv4 and IPv6 to support routing for each protocol.
- B. Incorrect.
Incorrect: Dual-stack mode is required for interface-level IPv4 and IPv6 support but is not directly related to BGP address-family configuration.
- C. Correct.
Correct: Each BGP neighbor needs to have address-family-specific activation to exchange routes for IPv4 and IPv6.
- D. Incorrect.
Incorrect: A single BGP session cannot handle both IPv4 and IPv6 routes under the same address-family. They must be configured separately.
- E. Correct.
Correct: Network statements are required within each address-family to advertise routes for IPv4 and IPv6.