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Configuring LSP Stitching Cross-Connects

LSP stitching cross-connects “stitch” together LSPs to join two LSPs. For example, they stitch together LSPs that fall in two different TED areas. The topology in Figure 32 illustrates an LSP stitching cross-connect. In this topology, the network is divided into two traffic engineering domains. CCC allows you to establish an LSP between the two domains by stitching together LSPs from the two domains. For LSP stitching to work, the LSPs must be dynamic LSPs, not static.

Figure 32: LSP Stitching Cross-Connect

Image g017090.gif

Without LSP stitching, a packet traveling from Router A to Router C is encapsulated on Router A (the ingress router for the first LSP), decapsulated on Router B (the egress router), and then reencapsulated on Router B (the ingress router for the second LSP). With LSP stitching, you connect LSP1 and LSP2 into a single, stitched LSP, which means that the packet is encapsulated once (on Router A) and decapsulated once (on Router C).

You can use LSP stitching to create a seamless LSP for LSPs carrying any kind of traffic.

To configure LSP stitching cross-connects, configure the two LSPs that you are stitching together on the two ingress routers. Then on the interdomain router (Router B in Figure 32), you define the connection between the two LSPs. The connection joins the LSP that comes from the connection’s source to the LSP that leads to the connection’s destination.



protocols {



connections { 



lsp-switch connection-name { 
transmit-lsp label-switched-path;
receive-lsp label-switched-path;
}


}


}

You can configure these statements at the following hierarchy levels:

[edit logical-systems logical-system-name protocols connections]
[edit protocols connections]

Example: Configuring LSP Stitching Cross-Connects

Configure a full-duplex LSP stitching cross-connect between Router A and Router C. To do this, you configure Router B, which is the interdomain router. See the topology in Figure 33.

Figure 33: Example Topology of LSP Stitching Cross-Connect

Image g017091.gif



[edit]
protocols {


connections interface-switch {


lsp-switch router-a-to-router-c { 
transmit-lsp lsp2;
receive-lsp lsp1;
}


}




connections {


lsp-switch router-c-to-router-a {
receive-lsp lsp3;
transmit-lsp lsp4;
}


}


}

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