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    LAC Configuration Prerequisites

    Before you begin configuring the router as an LAC, perform the following steps:

    1. Create a virtual router.
      host1(config)#virtual-router west
    2. Assign a router ID IP address, such as that for a loopback interface, to the virtual router. This address must be reachable by the L2TP peer.
      host1:west(config)#ip router-id

      Caution: You must explicitly assign a router ID to a virtual router rather than using a dynamically assigned router ID. A fixed ID is required because every time the ID changes, L2TP must disconnect all existing tunnels and sessions that use the old ID. If you use a dynamically assigned router ID, the value can change without warning, leading to failure of all L2TP tunnels and sessions. Also, the router could dynamically assign a router ID that is not reachable by the L2TP peer, causing a complete failure of L2TP. You must set the router ID even if you specified a source address in the domain map or a local address in the host profile.

    3. When configuring the router as a LAC, configure the router or virtual router for Broadband Remote Access Server (B-RAS).

      Note: If you are using shared tunnel-server ports, you must configure the shared tunnel-server ports before you configure Layer 2 Tunneling Protocol (L2TP) network server (LNS) support. You use the tunnel-server command in Global Configuration mode to specify the physical location of the shared tunnel-server port that you want to configure.

      See JunosE Physical Layer Configuration Guide for additional information about the tunnel-server command and shared tunnel-server ports.


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    Published: 2014-08-20