Huawei Quidway NetEngine80E Configuration Manual page 555

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
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:
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Procedure
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Issue 02 (2014-09-30)
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.
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.
NOTE
When the number of equal-cost routes is greater than number 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 preferences are selected for load balancing. For details
about route preference configuration, see
IS routes.
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.
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.
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7 IS-IS Configuration
Configure preference values for equal-cost IS-
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