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Example: RSVP LSP Tunnel Configuration

 
Figure 1: RSVP LSP Tunnel Topology Diagram
RSVP LSP Tunnel Topology Diagram

Figure 1 shows an end-to-end RSVP LSP called e2e_lsp_r0r5 that originates on Router 0 and terminates on Router 5. In transit, this LSP traverses the FA-LSP fa_lsp_r1r4. The return path is represented by the end-to-end RSVP LSP e2e_lsp_r5r0 that travels over the FA-LSP fa_lsp_r4r1.

On Router 0, configure the end-to-end RSVP LSP that travels to Router  5. Use a strict path that traverses Router 1 and the LMP traffic engineering link traveling from Router 1 to Router 4.

Router 0

On Router 1, configure an FA-LSP to reach Router 4. Establish an LMP traffic engineering link and LMP peer relationship with Router 4. Reference the FA-LSP in the traffic engineering link and add the peer interface into both OSPF and RSVP.

When the return path end-to-end LSP arrives at Router 1, the routing platform performs a routing lookup and can forward traffic to Router 0. Make sure you configure OSPF correctly between Routers 0 and 1.

Router 1

On Router 2, configure OSPF, MPLS, and RSVP on all interfaces that transport the FA-LSPs across the core network.

Router 2

On Router 3, configure OSPF, MPLS, and RSVP on all interfaces that transport the FA-LSPs across the core network.

Router 3

On Router 4, configure a return path FA-LSP to reach Router 1. Establish an LMP traffic engineering link and LMP peer relationship with Router 1. Reference the FA-LSP in the traffic engineering link and add the peer interface into both OSPF and RSVP.

When the initial end-to-end LSP arrives at Router 4, the routing platform performs a routing lookup and can forward traffic to Router 5. Make sure you configure OSPF correctly between Router 4 and Router 5.

Router 4

On Router 5, configure the return path end-to-end RSVP LSP that travels to Router 0. Use a strict path that traverses Router 4 and the LMP traffic engineering link traveling from Router 4 to Router 1.

Router 5

Verifying Your Work

To verify that your RSVP LSP tunnel is working correctly, issue the following commands:

  • show ted database (extensive)

  • show rsvp session name (extensive)

  • show link-management

  • show link-management te-link name (detail)

To see these commands used with the configuration example, see the following sections:

Router 0

On Router 0, you can verify that the FA-LSPs appear as valid paths in the traffic engineering database. In this case, look for the paths from Router 1 (10.255.41.216) and Router 4 (10.255.41.217) that reference the LMP traffic engineering link addresses of 172.16.30.1 and 172.16.30.2. You can also issue the show rsvp session extensive command to look for the path of the end-to-end LSP as it travels to Router 5 over the FA-LSP.

user@router0> show ted database

Router 1

On Router 1, verify that your LMP traffic engineering link configuration is working and that the end-to-end LSP is traversing the traffic engineering link by issuing the show link-management set of commands. You can also issue the show rsvp session extensive command to confirm that the FA-LSP is operational.

user@router1> show link-management