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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

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, and PBR.

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Configuring Principles for Using Equal-Cost IPv6 IS-IS Routes

Configuring Principles for Using Equal-Cost IPv6 IS-IS Routes


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

Configure load balancing for 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 equal-cost IS-IS routes to work in load-balancing mode.
    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 load-balancing equal-cost IPv6 IS-IS routes is set.

      By default, load balancing is supported and a maximum of 64 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. Interface index: If routes have the same priorities, routes with higher interface index values are selected for load balancing.
      3. Next hop IP address: If routes have the same priorities and interface index values, routes with larger IP address are selected for load balancing.

    4. Run commit

      The configuration is committed.

Updated: 2019-03-21

Document ID: EDOC1000166601

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