No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

Rate and give feedback:
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).
MP-BGP

MP-BGP

Traditional BGP-4 manages only IPv4 routing information. Inter-AS transmission of other network layer protocol packets (such as IPv6 and multicast packets) is limited. To support multiple network layer protocols, Multiprotocol BGP (MP-BGP) is designed in RFC 4760 as an extension to BGP-4. MP-BGP uses extended attributes and address families to support IPv6, multicast, and VPN, without changing the existing BGP packet forwarding and routing mechanism.

MP-BGP is called BGP4+ on IPv6 unicast networks or called multicast BGP (MBGP) on IPv4 multicast networks. MP-BGP establishes separate topologies for IPv6 unicast networks and IPv4 multicast networks, and stores IPv6 unicast and IPv4 multicast routing information in different routing tables. This ensures that routing information of IPv6 unicast networks and IPv4 multicast networks is separated from each other, and allows routes of different networks to be maintained using different routing policies.

Extended Attributes

In BGP, an Update message carries three IPv4-related attributes: NLRI, Next_Hop, and Aggregator.

To support multiple network layer protocols, BGP requires NLRI and Next_Hop attributes to carry information about network layer protocols. Therefore, MP-BGP uses the following new optional non-transitive attributes:

  • MP_REACH_NLRI: indicates the multiprotocol reachable NLRI. It is used to advertise reachable routes and next hop information.

  • MP_UNREACH_NLRI: indicates the multiprotocol unreachable NLRI. It is used to withdraw unreachable routes.

Address Families

MP-BGP uses address families to differentiate network layer protocols. Currently, devices support the following address family views:
  • BGP-IPv4 unicast address family view
  • BGP-IPv4 multicast address family view
  • BGP-VPN instance IPv4 address family view
  • BGP-VPNv4 address family view
  • BGP-IPv6 unicast address family view
  • BGP-VPN instance IPv6 address family view
Translation
Download
Updated: 2019-05-17

Document ID: EDOC1000174069

Views: 133149

Downloads: 274

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next