Configuring Principles For Using Equal-Cost Ipv6 Is-Is Routes; Filtering Ipv6 Is-Is Routes - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing
6.12.3 Configuring Principles for Using Equal-Cost IPv6 IS-IS
Routes
If multiple equal-cost IS-IS routes are available on a network, configure the equal-cost IS-IS
routes to work in load-balancing mode to increase the bandwidth usage of each link.
Context
If there are redundant IPv6 IS-IS links, multiple routes may have an equal cost. Configure the
equal-cost IPv6 IS-IS routes to work in load-balancing mode 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.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
isis [ process-id ]
The IS-IS view is displayed.
Step 3 Run:
ipv6 maximum load-balancing number
The maximum number of load-balancing equal-cost IS-IS routes is set.
----End

6.12.4 Filtering IPv6 IS-IS Routes

If some IS-IS routes are not preferred, configure conditions to filter IS-IS routes. Only IS-IS
routes meeting the specified conditions can be added to an IP routing table.
Context
Only routes in an IP routing table can be used to forward IP packets. An IS-IS route can take
effect only after this IS-IS route has been successfully added to an IP routing table.
If an IS-IS route does not need to be added to a routing table, specify conditions, such as IPv6
prefix, and routing policy, to filter routes so that only IS-IS routes that meet the specified
conditions can added to an IP routing table. IS-IS routes that do not meet the specified conditions
cannot be added to the IP routing table and cannot be selected to forward IP packets.
Issue 01 (2012-03-15)
NOTE
If the number of IS-IS equal-cost routes is greater than the value of number, the number of IS-IS equal-
cost routes to work in load-balancing mode is determined by number. If the number of IS-IS equal-cost
routes is smaller than the value of number, IS-IS equal-cost routes of the actual number work in load-
balancing mode.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
6 IS-IS Configuration
297