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Configuring a Multiclass LSP

You configure a multiclass LSP by using the standard LSP configuration statements and procedures. To configure an LSP as a multiclass LSP, specify the class type bandwidth constraints by including the bandwidth statement:




bandwidth {
ct0 bps;
ct1 bps;
ct2 bps;
ct3 bps;
}

For a list of hierarchy levels at which you can include the bandwidth statement, see the statement summary sections for these statements.

The class type statements specify bandwidth (in bits per second) for the following classes:

ct0—Bandwidth reserved for class 0
ct1—Bandwidth reserved for class 1
ct2—Bandwidth reserved for class 2
ct3—Bandwidth reserved for class 3

For example, to configure 50 megabytes of bandwidth for class type 1 and 30 megabytes of bandwidth for class type 2, include the bandwidth statement as follows:



[edit protocols mpls]
label-switched-path traffic-class {


bandwidth {
ct1 50M;
ct2 30M;
}


}

You cannot configure a bandwidth for a class type and also configure a bandwidth at the [edit protocols mpls label-switched-path lsp-name bandwidth] hierarchy level. For example, the following configuration cannot be committed:



[edit protocols mpls]
label-switched-path traffic-class {


bandwidth {
20M;
ct1 10M;
}


}

You can configure setup and holding priorities for a multiclass LSP, but the following restrictions apply:

The setup and holding priorities apply to all classes for which bandwidth is requested.
The combination of class and priority must be one of the configured traffic engineering classes. The default traffic engineering class configuration results in multiclass LSPs that cannot preempt and cannot be preempted. The default setup priority is 7 and the default holding priority is 0.
Configuring an invalid combination of class type and priority causes the commit operation to fail.
Automatic bandwidth allocation is not supported for multiclass LSPs. If you configure automatic bandwidth allocation, the commit operation fails.
LSPs configured with the bandwidth statement but without specifying a class type use the default class type ct0.

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