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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R011C10

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.

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Configuring Equal-Cost IPv6 IS-IS Routes

Configuring Equal-Cost IPv6 IS-IS Routes


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.


  • 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, load balancing is supported and a maximum of 16 equal-cost routes can participate in load balancing.

      When the number of equal-cost routes is greater than number 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 priorities, routes with smaller system IDs are selected for load balancing.
      3. Interface index: If routes have the same priorities and system IDs, routes with lower interface index values are selected for load balancing.

Updated: 2019-10-18

Document ID: EDOC1000178324

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