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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 IS-IS Routes

Configuring Equal-Cost IS-IS Routes

Context

If there are redundant IS-IS links, multiple routes may have an equal cost. Choose either of the following methods to use these equal-cost IS-IS routes:
  • 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 preference values for equal-cost IS-IS routes so that only the route with the highest preference will be used and the others function as backups.

    This configuration facilitates traffic management and improves the network reliability, without the need to change original configurations.

Procedure

  • 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 maximum load-balancing number

      The maximum number of load-balancing equal-cost IS-IS routes 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 maximum load-balancing command, valid routes are selected for load balancing based on the following criteria:
      1. Route preference: Routes with lower preference values (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.

  • Configure preference values for 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 nexthop ip-address weight value

      A preference value is configured for an equal-cost IS-IS route.

      By default, no preference is set for equal-cost IS-IS routes. A smaller value indicates a higher priority.

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Updated: 2019-04-08

Document ID: EDOC1100065744

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