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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R013C00

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, IP Routing Table Management, and PBR.
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Configuring Equal-Cost Routes

Configuring Equal-Cost Routes

Context

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

For example, in Figure 5-68, three routes between switchA and switchB that run OSPF have the same costs. The three routes are equal-cost routes for load balancing.

Figure 5-68  Networking diagram for configuring 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.

    By default, the maximum number of equal-cost routes is 64.

  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 exceeds the limit specified in the maximum load-balancing command, valid routes are randomly selected for load balancing. To specify valid routes for load balancing, you can run the nexthop command to set the route preferences of the routes to higher values.

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

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Updated: 2019-04-08

Document ID: EDOC1100065744

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