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Option: Reserving LSP Bandwidth for a Layer 2 Circuit

 

You can specify the amount of bandwidth in bytes per second that must be available on an LSP for a specific Layer 2 circuit. By using a bandwidth constraint for a Layer 2 circuit, the router performs a type of call admission control. If an LSP exists that contains the required bandwidth, the Layer 2 circuit is established. If the bandwidth is not available on an LSP, the Layer 2 circuit is not established.

To configure bandwidth requirements for a Layer 2 circuit, include the bandwidth statement at the [edit protocols mpls label-switched-path lsp-name] hierarchy level and the [edit protocols l2circuit neighbor ip-address interface interface-name] hierarchy level.

You can also assign minimum bandwidth requirements for class-of-service (CoS) queues within a Layer 2 circuit and its corresponding LSP. Class type (CT) queues 0, 1, 2, and 3 in a Layer 2 circuit or LSP correspond to the standard four CoS queues available on M Series, MX Series, and T Series routers. To enable mapping of class type queues to the standard CoS queues, include the bandwidth-model statement at the [edit protocols mpls diffserv-te] hierarchy level. To assign specific bandwidth requirements to each class type queue, include the ct0, ct1, ct2, and ct3 statements at the [edit protocols mpls label-switched-path lsp-name bandwidth] hierarchy level and the [edit protocols l2circuit neighbor ip-address interface interface-name bandwidth] hierarchy level.