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Configuring a Traffic Engineered LSP

You configure an LSP by using the standard LSP configuration statements and procedures. To configure DiffServ-aware traffic engineering for the LSP, specify a class type bandwidth constraint by including the bandwidth statement:



label-switched-path lsp-name {



bandwidth {
ctnumber bps;
}


}

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

If you do not specify a bandwidth for a class type, ct0 is automatically specified as the queue for the LSP. You can configure only one class type for each LSP, unlike multiclass LSPs.

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

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

The combination of class and priority must be one of the configured traffic engineering classes. 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. 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.
For migration issues, see Internet draft draft-ietf-tewg-diff-te-proto-07.txt.

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