Before You Begin

Before you begin configuring IS-IS, complete the following tasks:

• Establish basic connectivity. See the Getting Started Guide for your device.

• If your router is in secure context, enable IS-IS. By default in secure context, the router drops IS-IS packets. Enable the router in one of the following ways to forward IS-IS packets:

  • In the J-Web interface, select Configuration>View and Edit>Edit Configuration. To reach the correct J-Web page, select Configure or Edit next to Security, Forwarding options, Family, and finally Iso. Next to Mode, select packet-based. Click OK.
  • From configuration mode in the CLI, enter the command set security forwarding-options family iso mode packet-based.

  Note: JUNOS software security processing is not applied to IS-IS packets forwarded by the router.

• If you do not already have an understanding of IS-IS, read IS-IS Overview or the JUNOS Routing Protocols Configuration Guide.
• Obtain ISO addresses for participating routers in the AS.
• Configure security filters. See the JUNOS Software Security Configuration Guide.

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