CLNS Configuration Overview

To configure CLNS:

  1. Configure the network interfaces. See the Junos OS Interfaces Configuration Guide for Security Devices.
  2. If applicable, configure BGP and VPNs. See:
  3. Configure a VPN routing instance. You typically configure ES-IS, IS-IS, and CLNS static routes using a VPN routing instance. See Example: Configuring a VPN Routing Instance for CLNS.

  4. Configure one or more of the following protocols for CLNS (depending on your network).

    • ES-IS—If a device is a PE router within a CLNS island that contains any end systems, you must configure ES-IS on the device. If a CLNS island does not contain any end systems, you do not need to configure ES-IS on a device. See Example: Configuring ES-IS for CLNS.

      Note: ES-IS is enabled only if either ES-IS or IS-IS is configured on the router. ES-IS must not be disabled. If ES-IS is not explicitly configured, the interface sends and receives only intermediate system hello (ISH) messages. If ES-IS is explicitly configured and disabled, the interface does not send or receive ES-IS packets. If ES-IS is explicitly configured and not disabled, the interface sends and receives ISH messages as well as ES-IS packets.

      One of the interfaces that is configured for ES-IS must be configured with an ISO address for hello messages. The ISO address family must be configured on an interface to support ES-IS on that interface.

    • IS-IS—You can configure IS-IS to exchange CLNS routes within a CLNS island. See Example: Configuring IS-IS for CLNS.

      Note: If you have a pure CLNS island—an island that does not contain any IP devices—you must disable IPv4 and IPv6 routing. Also, to export BGP routes into IS-IS, you must configure and apply an export policy.

    • Static routes—If some devices in your network do not support IS-IS, you must configure CLNS static routes. You can use static routing with or without IS-IS. You might also consider using static routes if your network is simple. See Example: Configuring Static Routes for CLNS.
    • BGP—See Example: Configuring BGP for CLNS VPNs.

Note: Many of the configuration statements used to configure CLNS and routing protocols can be included at different hierarchy levels in the configuration. For more information, see the Junos Routing Protocols Configuration Guide.

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