DELL 9.8(0.0) User Manual

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Intermediate System to Intermediate 

System (IS-IS)

The intermediate system to intermediate system (IS-IS) protocol for IPv4 and IPv6 is supported on the 
S4820T platform.
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.

 

adjacency-check

Verify that the “protocols supported” field of the IS-IS neighbor contains matching values to this router.

Syntax

adjacency-check
To disable adjacency check, use the no adjacency-check command.

Defaults

Enabled.

Command 
Modes

• ROUTER ISIS (for IPv4)
• CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (for IPv6)

Command 
History

This guide is platform-specific. For command information about other platforms, 
refer to the relevant Dell Networking OS Command Line Reference Guide.

The following is a list of the Dell Networking OS version history for this command.

1024

Intermediate System to Intermediate System (IS-IS)