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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).


Conventional BGP-4 manages only IPv4 unicast routing information, and inter-AS transmission of packets of other network layer protocols, such as multicast, is limited.

To support multiple network layer protocols, the Internet Engineering Task Force (IETF) extends BGP-4 to Multiprotocol Extensions for BGP-4 (MP-BGP). MP-BGP is forward compatible. Specifically, ME devices supporting MP-BGP can communicate with the ME devices that do not support MP-BGP.

As an enhancement of BGP-4, MP-BGP provides routing information for various routing protocols, including IPv6 (BGP-4) and multicast.
  • MP-BGP maintains both unicast and multicast routes. It stores them in different routing tables to separate unicast routing information from multicast routing information.

  • MP-BGP supports both unicast and multicast address families and can build both the unicast routing topology and multicast routing topology.

  • Most unicast routing policies and configurations supported by BGP-4 can be applied to multicast, and BGP-4 can maintain unicast and multicast routes according to these routing policies.

Extended Attributes

BGP-4 Update packets carry three IPv4-related attributes: NLRI (Network Layer Reachable Information), Next_Hop, and Aggregator. Aggregator contains the IP address of the BGP speaker that performs route aggregation.

To carry information about multiple network layer protocols in NLRI and Next_Hop, MP-BGP introduces the following route attributes:

  • MP_REACH_NLRI: indicates the multiprotocol reachable NLRI. It is used to advertise a reachable route and its next hop.

  • MP_UNREACH_NLRI: indicates the multiprotocol unreachable NLRI. It is used to delete an unreachable route.

The preceding two attributes are optional non-transitive. Therefore, the BGP speakers that do not support MP-BGP will ignore the information carried in the two attributes and do not advertise the information to other peers.

Address Family

The Address Family Information field consists of a 2-byte Address Family Identifier (AFI) and a 1-byte Subsequent Address Family Identifier (SAFI).

BGP uses address families to distinguish different network layer protocols. For the values of address families, see relevant standards. The ME60 supports multiple MP-BGP extension applications, such as VPN extension and IPv6 extension, which are configured in their respective address family views.

For details about the BGP VPNv4 address family and BGP VPN instance address family, see the HUAWEI ME60 Multiservice Control Gateway Feature Description - VPN.

Updated: 2019-01-04

Document ID: EDOC1100059473

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