Reference Guide
29
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
FTOS 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.
S4820T
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
FTOS Command Line Reference Guide
.
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
Version 7.5.1.0 Introduced on the E-Series.
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