Service Manual

Intermediate System to Intermediate System (IS-
IS)
The Dell Networking OS supports the intermediate system to intermediate system (IS-IS) protocol for IPv4 and IPv6.
IS-IS is an interior gateway protocol that uses a shortest-path-first algorithm. IS-IS facilitates the communication between open systems,
supporting routers passing both IP and OSI traffic.
A router is considered an intermediate system. Networks are partitioned into manageable routing domains, called areas. Intermediate
systems send, receive, and forward packets to other routers within their area (Level 1 and Level 1-2 devices). Only Level 1-2 and Level 2
devices communicate with other areas.
IS-IS protocol standards are listed in the Standard Compliance chapter in the Dell Networking OS Configuration Guide.
NOTE: The fundamental mechanisms of IS-IS are the same between IPv4 and IPv6. Where there are differences between the
two versions, they are identified and clarified in this chapter. Except where identified, the information in this chapter applies to
both protocol versions.
Topics:
• adjacency-check
• advertise
• area-password
• clear config
• clear isis
• clns host
• debug isis
• debug isis adj-packets
• debug isis local-updates
• debug isis snp-packets
• debug isis spf-triggers
• debug isis update-packets
• default-information originate
• description
• distance
• distribute-list in
• distribute-list out
• distribute-list redistributed-override
• domain-password
• graceful-restart ietf
• graceful-restart interval
• graceful-restart t1
• graceful-restart t2
• graceful-restart t3
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722 Intermediate System to Intermediate System (IS-IS)