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Configuring LDP-Signaled LSPs

Using LDP as a signaling protocol, you create LSPs between Services Routers in an IP network. A sample network is shown in Figure 4.

Figure 4: Typical LDP-Signaled LSP

Image g015525.gif

To establish an LSP between Services Routers R6 and R7, you must configure LDP on Services Routers R5, R6, and R7. This configuration ensures that Hosts C1 and C2 use the LDP-signaled LSP when the entry (ingress) router is R6 or R7.

To configure LDP to establish the LSP shown in Figure 4, perform these steps:

  1. Navigate to the top of the configuration hierarchy in either the J-Web or CLI configuration editor.
  2. Perform the configuration tasks described in Table 6.
  3. If you are finished configuring the router, commit the configuration.
  4. Go on to Verifying an LDP-Signaled LSP.

Table 6: Configuring an LDP-Signaled LSP

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Interfaces level of the configuration hierarchy

In the configuration editor hierarchy, select Interfaces.

From the top of the configuration hierarchy, enter

edit interfaces

Enable the MPLS family on all transit interfaces on each router in the MPLS network.
  1. Click the transit interface on which you want to configure MPLS.
  2. In the Unit table, click the unit number for which you want to enable MPLS.
  3. In the Family area, select the Mpls check box.
  4. Click OK.
  5. Repeat Steps 1 through 4 for each transit interface on the routers in the MPLS network.
  1. Add the MPLS family to all transit interfaces. For example:

    set fe-0/0/0 unit 0 family mpls

  2. Repeat Step 1 for each transit interface on the routers in the MPLS network.

Enable the MPLS process on all MPLS interfaces for each router in the MPLS network.
  1. Navigate to the Protocols>Mpls level in the configuration hierarchy.
  2. Next to Interface, click Add new entry.
  3. In the Interface name box, type all.
  4. Click OK.
  5. Repeat Steps 1 through 4 for each transit interface on the routers in the MPLS network.
  1. From the top of the configuration hierarchy, enter

    edit protocols mpls

  2. Enter

    set interface all

  3. Repeat Steps 1 and 2 for each transit interface on the routers in the MPLS network.

Create the LDP instance on each Services Router in the MPLS network.
  1. Navigate to the Protocols>Ldp level in the configuration hierarchy.
  2. Next to Interface, click Add new entry.
  3. In the Interface name box, type the name of a transit interface—for example, fe-0/0/0.
  4. Click OK.
  5. Repeat Steps 1 through 4 for each transit interface on the routers in the MPLS network.
  1. From the top of the configuration hierarchy, enter

    edit protocols ldp

  2. Enable LDP on a transit interface. For example:

    set interface fe-0/0/0

  3. Repeat Steps 1 and 2 for each transit interface on the routers in the MPLS network.

Set the keepalive interval to 5 seconds.

The keepalive interval specifies the number of seconds between the transmission of keepalive messages along the LDP link.
  1. In the Keepalive interval box, type 5.
  2. Click OK.
  3. Repeat Steps 1 and 2 for each router in the MPLS network.

On each router in the MPLS network, enter

set keepalive-interval 5

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