HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Routing Confi - Page 239
Configuring IPv6 BGP, IPv6 BGP overview, IPv6 BGP configuration task list
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Configuring IPv6 BGP This chapter describes only configuration for IPv6 BGP. For BGP related information, see "Configuring BGP." The term "router" in this chapter refers to both routers and Layer 3 switches. IPv6 BGP overview BGP-4 was designed to carry only IPv4 routing information, so 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). For brevity purposes, MP-BGP for IPv6 is called "IPv6 BGP." IPv6 BGP puts IPv6 network layer information into the attributes of Network Layer Reachability Information (NLRI) and NEXT_HOP. The NLRI attribute of IPv6 BGP involves the following: • MP_REACH_NLRI-Multiprotocol Reachable NLRI, for advertising reachable route and next hop information. • 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. IPv6 BGP has the same messaging and routing mechanisms as BGP. IPv6 BGP configuration task list Task Configuring IPv6 BGP basic functions Controlling route distribution Remarks Specifying an IPv6 BGP peer Required Injecting a local IPv6 route Optional Configuring a preferred value for routes from a peer or peer group Optional Specifying the source interface for establishing TCP connections Optional Allowing the establishment of an indirect EBGP connection Optional Configuring a description for an IPv6 peer or peer group Optional Disabling session establishment to an IPv6 peer or peer group Optional Logging IPv6 peer or peer group state changes Optional Configuring IPv6 BGP route redistribution Optional 229
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