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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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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).
Configuring a BGP Route Reflector

Configuring a BGP Route Reflector

Context

To ensure the connectivity between IBGP peers within an AS, you need to establish full-mesh connections between the IBGP peers. When there are many IBGP peers, it is costly to establish a fully-meshed network. A route reflector (RR) can solve this problem.

A cluster ID can help prevent routing loops between multiple RRs within a cluster and between clusters. When a cluster has multiple RRs, the same cluster ID must be configured for all the RRs within the cluster.

If full-mesh IBGP connections are established between clients of multiple RRs, route reflection between clients is not required and wastes bandwidth resources. In this case, prohibit route reflection between clients to reduce the network burden.

Within an AS, an RR transmits routing information and forwards traffic. When an RR connects to a large number of clients and non-clients, many CPU resources are consumed if the RR transmits routing information and forwards traffic simultaneously. This also reduces route transmission efficiency. To improve route transmission efficiency, prohibit BGP from adding preferred routes to IP routing tables on the RR to enable the RR only to transmit routing information.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run bgp { as-number-plain | as-number-dot }

    BGP is enabled and the BGP view is displayed.

  3. Enter the corresponding address family view based on network type to configure BGP devices on networks.

    • Run ipv4-family unicast

      The IPv4 address family view is displayed.

    • Run ipv6-family [ unicast ]

      The IPv6 address family view is displayed.

  4. Run peer { group-name | ipv4-address | ipv6-address } reflect-client

    An RR and its client are configured.

    By default, the route reflector and its client are not configured.

  5. (Optional) Run reflector cluster-id cluster-id

    A cluster ID is configured for the RR.

    By default, each RR uses its router ID as the cluster ID.

  6. (Optional) Run undo reflect between-clients

    Route reflection is prohibited between clients.

    By default, route reflection is allowed between clients.

  7. (Optional) Run routing-table rib-only [ route-policy route-policy-name ]

    BGP is prohibited from adding preferred routes to IP routing tables.

    By default, BGP adds preferred routes to IP routing tables.

Verifying the Configuration

  • Run the display bgp group [ group-name ] command to check information about the specified BGP peer group.
  • Run the display bgp routing-table [ ipv4-address [ { mask | mask-length } [ longer-prefixes ] ] ] command to check routing information in a BGP routing table.
  • Run the display bgp multicast routing-table [ ip-address [ mask-length [ longer-prefixes ] | mask [ longer-prefixes ] ] ] command to check the MBGP routing table.
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Updated: 2019-05-20

Document ID: EDOC1100034072

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