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Configuring LDP-Signaled LSPs

Using LDP as a signaling protocol, you create LSPs between routers in an IP network. A sample network is shown in Figure 77.

Figure 77: Typical LDP-Signaled LSP

Image g015525.gif

To establish an LSP between Routers R6 and R7, you must configure LDP on 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 77, 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 130.
  3. If you are finished configuring the router, commit the configuration.
  4. Go on to Verifying an LDP-Signaled LSP.

Table 130: Configuring an LDP-Signaled LSP

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Interfaces level of the configuration hierarchy

  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Interfaces, click Configure or Edit.

From the [edit] hierarchy level, 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 ge-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.

(See the interface naming conventions in Network Interface Naming.)
  1. On the main Configuration page next to Protocols, click Configure or Edit.
  2. Next to Mpls, click Configure or Edit.
  3. Next to Interface, click Add new entry.
  4. In the Interface name box, type all.
  5. Click OK.
  6. Repeat Steps 1 through 5 for each transit interface on the routers in the MPLS network.
  1. From the [edit] hierarchy level, 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 router in the MPLS network.
  1. On the main Configuration page next to Protocols, click Configure or Edit.
  2. Next to Ldp, click Configure or Edit.
  3. Next to Interface, click Add new entry.
  4. In the Interface name box, type the name of a transit interface—for example, ge-0/0/0.
  5. Click OK.
  6. Repeat Steps 1 through 5 for each transit interface on the routers in the MPLS network.
  1. From the [edit] hierarchy level, enter

    edit protocols ldp

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

    set interface ge-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 10 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 10.
  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 10

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