 | Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
You can enable fast reroute for multiclass LSPs. The bandwidth guarantees for the class types can be carried over to the detour path in case the primary path of the multiclass LSP fails. The same traffic class types configured for the primary multiclass LSP are also signaled for the detour LSP.
The bandwidth guarantee for the detour path is a percentage of the bandwidth configured for the class types of the primary path. For example, you configure a value of 50 percent for the detour path and the protected LSP carries traffic for class types CT0 through CT3. The detour path is signaled with the same class types (CT0 through CT3) but with 50 percent of the bandwidth configured for the protected LSP.
If you configure the router to reserve bandwidth for the detour path, a check is made to ensure that the link is capable of handling DiffServ-aware traffic engineering, that all of the traffic class types needed are available, and for CoS capability before accepting it as a potential detour path. Unsupported links are not used.
The bandwidth percentage for fast reroute is signaled from the ingress router to the egress router. All of the intermediate devices must complete their own CSPF computations and signaling.
When you configure the bandwidth-percent statement, the detour path bandwidth is computed by multiplying it to the bandwidth configured for the primary multiclass LSP. For information on how to configure the bandwidth for the multiclass LSP, see Configuring a Traffic Engineered LSP.
To configure the percent of bandwidth used by the detour path based on the bandwidth of the protected path, include the bandwidth-percent statement:
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bandwidth-percent percentage;
You can include this statement at the following hierarchy levels:
| Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |