Configure ECMP

Enable Equal Cost MultiPath (ECMP) to permit routers to determine up to eight equal-cost paths to the same destination prefix. You can use the multiple paths for load-sharing of traffic, which allows fast convergence to alternative paths. By maximizing load sharing among equal-cost paths, you can maximize the efficiency of links between routers.

Before you begin

  • To perform this procedure on a non-default VRF, you must first change the VRF instance. For information about how to use EDM for a non-default VRF, see Select and Launch a VRF Context View. All parameters might not be available in non-default VRFs.

  • To configure an ECMP pathlist, you must first configure a prefix list that you reference in the pathlist configuration.

About this task

Different hardware platforms can support a different number of ECMP paths. For more information, see Fabric Engine Release Notes.

Procedure

  1. In the navigation pane, expand Configuration > IP.
  2. Select IP.
  3. Select the Globals tab.
  4. Select EcmpEnable.
  5. Optional: In EcmpMaxPath, type the preferred maximum number of equal-cost paths.
  6. Optional: Configure an ECMP pathlist to specify routes with the required number of paths.
  7. Optional: If you modified the ECMP pathlist configuration, select EcmpPathListApply.
  8. Select Apply.