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Configuring Bandwidth Allocation and Call Admission Control

You can configure bandwidth allocation and call admission control (CAC) on Layer 2 circuits. This feature is available for RSVP-signaled LSPs traversing an MPLS network.

When you enable bandwidth allocation on a Layer 2 circuit, attempts to establish an RSVP-signaled LSP are preceded by a check of the available bandwidth on the network. This check is the CAC. The available bandwidth is compared to the bandwidth requested by the LSP. If there is insufficient bandwidth, the Layer 2 circuit is not established and an error message is generated. To apply CAC to a Layer 2 circuit, a bandwidth constraint must be configured.

You can specify the bandwidth for a Layer 2 circuit without configuring a bandwidth for each class type (queue). To specify the bandwidth allocation for a Layer 2 circuit, include the bandwidth statement:




bandwidth bandwidth;

Specify the bandwidth in bits per second.

You can include the bandwidth statement at the following hierarchy levels:

[edit protocols l2circuit neighbor address interface interface-name]
[edit logical-systems logical-system-name protocols l2circuit neighbor address interface interface-name]

Alternatively, you can configure the bandwidth for each class type on a Layer 2 circuit. If you use this type of configuration, you cannot simultaneously configure the nonclass type of bandwidth configuration for the Layer 2 circuit (the commit operation fails).

To configure the bandwidth for each class type on an Layer 2 circuit, include the bandwidth statement:




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

You can include the bandwidth statement at the following hierarchy levels:

[edit protocols l2circuit neighbor address interface interface-name]
[edit logical-systems logical-system-name protocols l2circuit neighbor address interface interface-name]

Specify the bandwidth for each class type in bits per second. It is not necessary to specify a bandwidth for all four class types.

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