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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 IPv6 IS-IS Routes

Configuring Equal-Cost IPv6 IS-IS Routes

Context

If there are redundant IS-IS links, multiple routes may have an equal cost.

Configure load balancing among equal-cost IS-IS routes so that traffic will be evenly balanced among these links. This mechanism increases the link bandwidth usage and prevents network congestion caused by link overload. However, this mechanism may make traffic management more difficult because traffic will be randomly forwarded.

Procedure

  • Configure load balancing among equal-cost IS-IS routes.
    1. Run system-view

      The system view is displayed.

    2. Run isis [ process-id ]

      The IS-IS view is displayed.

    3. Run ipv6 maximum load-balancing number

      The maximum number of equal-cost IPv6 IS-IS routes for load-balancing is set.

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

      NOTE:
      When the number of equal-cost routes is larger than the value specified in the ipv6 maximum load-balancing command, valid routes are selected for load balancing based on the following criteria:
      1. Route preference: Routes with higher preferences are selected for load balancing.
      2. Next hop system ID: If routes have the same preference, routes with smaller system IDs are selected for load balancing.
      3. Interface index: If routes have the same preference and system ID, routes with lower interface index values are selected for load balancing.

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Updated: 2019-04-08

Document ID: EDOC1100065744

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