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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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Configuring Equal-Cost Routes

Configuring Equal-Cost Routes

Context

If the destinations and costs of the multiple routes discovered by one routing protocol are the same, load balancing can be implemented among the routes.

As shown in Figure 5-32, three routes between RouterA and RouterB that run OSPF have the same costs. The three routes are equal-cost routes for load balancing.

Figure 5-32 Networking diagram of equal-cost routes

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ospf [ process-id ]

    The OSPF process view is displayed.

  3. Run maximum load-balancing number

    The maximum number of equal-cost routes is set.

    NOTE:

    By default, the AR100&AR120&AR150&AR160&AR200 series, AR1200 series, AR2201-48FE, AR2202-48FE, AR2204-27GE, AR2204-27GE-P, AR2204-51GE-P, AR2204-51GE, AR2204-51GE-R, AR2204E AR2204E-D, and AR2204 support a maximum of four equal-cost routes, and the AR2220, AR2220E, AR2204XE, AR2240(using SRU40, SRU60, or SRU80, SRU100E ), AR2240C, AR3600(using SRUX5), and AR3200(using SRU40, SRU60, or SRU80, SRU100E ) series support a maximum of eight equal-cost routes, AR2240(using SRU200, SRU200E , or SRU400), and AR3200(using SRU200, SRU200E, or SRU400) series support a maximum of sixteen equal-cost routes.

  4. (Optional) Run nexthop ip-address weight value

    The route preferences are configured for load balancing.

    When the number of equal-cost routes on the live network is greater than that specified in the maximum load-balancing command, valid routes are randomly selected for load balancing. To specify valid routes for load balancing, run the nexthop command to set the route preference. Ensure that the preferences of valid routes to be used are high.

    The smaller the weight value, the higher the preference of the route. The default weight value is 255, which indicates that load balancing is implemented regardless of the route preferences.

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Updated: 2019-05-20

Document ID: EDOC1100034072

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