In BGP4+ (used for IPv6 routing), the MP_REACH_NLRI attribute is used to advertise reachable routes. The Next Hop field must:
Contain a global unicast IPv6 address
Link-local addresses are not used in MP_REACH_NLRI because they are valid only on a local link and not suitable for inter-AS routing.
RFC 2545 (Multiprotocol Extensions for BGP-4) also states that the Next Hop must be a routable global address.
Therefore:
C. It must be a global unicast address — is correct.
The other options involving link-local addresses are incorrect.
[Reference:Huawei HCIE-Datacom V1.0 Study Guide —Chapter: BGP for IPv6 (BGP4+)Section: MP_REACH_NLRI Attributes and IPv6 Routing, , ]
Contribute your Thoughts:
Chosen Answer:
This is a voting comment (?). You can switch to a simple comment. It is better to Upvote an existing comment if you don't have anything to add.
Submit