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ME60 V800R010C10SPC500 Configuration Guide - IP Routing 01

This is ME60 V800R010C10SPC500 Configuration Guide - IP Routing
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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).
Overview of BGP4+

Overview of BGP4+

BGP4+ controls route advertisement and selects optimal routes.

BGP4+ Definition

As a dynamic routing protocol used between ASs, BGP4+ is an extension of BGP.

Traditional BGP4 manages IPv4 routing information but does not support the inter-AS transmission of packets encapsulated by other network layer protocols (such as IPv6).

To support IPv6, BGP4 must have the additional ability to associate an IPv6 protocol with the next hop information and network layer reachable information (NLRI).

Two NLRI attributes that were introduced to BGP4+ are as follows:

  • Multiprotocol Reachable NLRI (MP_REACH_NLRI): carries the set of reachable destinations and the next hop information used for packet forwarding.

  • Multiprotocol Unreachable NLRI (MP_UNREACH_NLRI): carries the set of unreachable destinations.

The Next_Hop attribute in BGP4+ is in the format of an IPv6 address, which can be either a globally unique IPv6 address or a next hop link-local address.

Using multiple protocol extensions of BGP4, BGP4+ is applicable to IPv6 networks without changing the messaging and routing mechanisms of BGP4.

Purpose

BGP transmits route information between ASs. It, however, is not required in all scenarios.

Figure 11-1 BGP networking

BGP is required in the following scenarios:

  • On the network shown in Figure 11-1, users need to be connected to two or more ISPs. The ISPs need to provide all or part of the Internet routes for the users. Routers, therefore, need to select the optimal route through the AS of an ISP to the destination based on the attributes carried in BGP routes.

  • The AS_Path attribute needs to be transmitted between users in different organizations.

  • Users need to transmit VPN routes through a Layer 3 VPN. For details, see the HUAWEI ME60 Feature Description - VPN.

  • Users need to transmit multicast routes and construct a multicast topology. For details, see the HUAWEI ME60 Feature Description - IP Multicast.

BGP is not required in the following scenarios:

  • Users are connected to only one ISP.

  • The ISP does not need to provide Internet routes for users.

  • ASs are connected through default routes.

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Updated: 2019-01-04

Document ID: EDOC1100059437

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