H3C Technologies H3C S7500E Series Switches - Manual (Page 330)

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IPv6 BGP Configuration
z The term “router” in this document refers to a router in a generic sense or a Layer 3 switch.
z EA cards (such as LSQ1GP12EA and LSQ1TGX1EA) do not support IPv6 features.
z This chapter describes only configuration for IPv6 BGP. For BGP related information, see BGP
Configuration in the Layer 3 - IP Routing Configuration Guide.
When configuring IPv6 BGP, go to these sections for information you are interested in:
z IPv6 BGP Overview
z Configuration Task List
z Configuring IPv6 BGP Basic Functions
z Controlling Route Distribution and Reception
z Configuring IPv6 BGP Route Attributes
z Tuning and Optimizing IPv6 BGP Networks
z Configuring a Large Scale IPv6 BGP Network
z Displaying and Maintaining IPv6 BGP
z IPv6 BGP Configuration Examples
z Troubleshooting IPv6 BGP Configuration
IPv6 BGP Overview
BGP-4 was designed to carry only IPv4 routing information, and thus other network layer protocols
such as IPv6 are not supported.
To support multiple network layer protocols, IETF extended BGP-4 by introducing Multiprotocol BGP
(MP-BGP), which is defined in RFC 2858 (multiprotocol extensions for BGP-4).
MP-BGP for IPv6 is referred to as IPv6 BGP for short.
IPv6 BGP puts IPv6 network layer information into the attributes of network layer reachable information
(NLRI) and NEXT_HOP.
The NLRI attribute of IPv6 BGP involves:
z MP_REACH_NLRI: Multiprotocol Reachable NLRI, for advertising reachable route and next hop
information.
z MP_UNREACH_NLRI: Multiprotocol Unreachable NLRI, for withdrawal of unreachable routes.
The NEXT_HOP attribute of IPv6 BGP is identified by an IPv6 unicast address or IPv6 local link
address.