R3303-HP HSR6800 Routers Layer 3 - IP Routing Configuration Guide

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• MP_UNREACH_NLRI—Multiprotocol Unreachable NLRI, for carrying prefixes of unfeasible routes
for multiple network layer protocols. Such routes can then be withdrawn.
MP-BGP uses these attributes to advertise feasible and unfeasible routes of different network layer
protocols. BGP speakers not supporting MP-BGP ignore updates containing these attributes and do not
forward them to its peers.
The system supports multiple MP-BGP extensions, including VPN extension (see MPLS Configuration
Guide), IPv6 extension (see "Configuring IPv6 BGP"), and multicast extension (see IP Multicast
Configuration Guide).
Address family
MP-BGP uses address families and subsequent address families to differentiate network layer protocols of
routes contained in the MP_REACH_NLRI and MP_UNREACH_NLRI attributes. For example, an Address
Family Identifier (AFI) of 2 and Subsequent Address Family Identifier (SAFI) of 1 indicates IPv6 unicast
routing information carried in the MP_REACH_NLRI attribute. For address family values, see RFC 1700.
Protocols and standards
• RFC 1700, ASSIGNED NUMBERS
• RFC 1771, A Border Gateway Protocol 4 (BGP-4)
• RFC 2858, Multiprotocol Extensions for BGP-4
• RFC 3392, Capabilities Advertisement with BGP-4
• RFC 2918, Route Refresh Capability for BGP-4
• RFC 2439, BGP Route Flap Damping
• RFC 1997, BGP Communities Attribute
• RFC 2796, BGP Route Reflection
• RFC 3065, Autonomous System Confederations for BGP
• RFC 4271, A Border Gateway Protocol 4 (BGP-4)
• RFC 4360, BGP Extended Communities Attribute
• RFC 4724, Graceful Restart Mechanism for BGP
• RFC 4760, Multiprotocol Extensions for BGP-4
• RFC 5291, Outbound Route Filtering Capability for BGP-4
• RFC 5292, Address-Prefix-Based Outbound Route Filter for BGP-4
• draft-ietf-idr-restart-08, Graceful Restart Mechanism for BGP
BGP configuration task list
In a basic BGP network, you only need to perform the following configurations:
• Enable BGP.
• Configure BGP peers or peer groups.
• Control BGP route generation.
To control BGP route distribution and path selection, you must perform other configurations.