CLI Guide

Parameters
level-1 You can form a Level 1 adjacency if there is at least one
common area address between this system and neighbors.
You cannot form Level 2 adjacencies on this interface.
level-1-2 You can form a Level 1 and Level 2 adjacencies when the
neighbor is also configured as Level-1-2 and there is at least
one common area, if not, a Level 2 adjacency is established.
This setting is the default.
level-2-only You can form a Level 2 adjacencies when other Level 2 or
Level 1-2 routers and their interfaces are configured for
Level 1-2 or Level 2. Level 1 adjacencies cannot be
established on this interface.
Defaults level-1-2
Command Modes INTERFACE
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
Because the default establishes Level 1 and Level 2 adjacencies, you do not need to
configure this command. Routers in an IS-IS system must be configured as a Level
1-only, Level 1-2, or Level 2-only system.
Only configure interfaces as Level 1 or Level 2 on routers that are between areas
(for example, a Level 1-2 router) to prevent the software from sending unused hello
packets and wasting bandwidth.
isis csnp-interval
Configure the IS-IS complete sequence number PDU (CSNP) interval on an interface.
Syntax
isis csnp-interval seconds [level-1 | level-2]
To return to the default values, use the no isis csnp-interval [seconds]
[level-1 | level-2] command.
Parameters
seconds Interval of transmission time between CSNPs on multi-
access networks for the designated intermediate system.
The range is from 0 to 65535. The default is 10.
level-1 (OPTIONAL) Independently configures the interval of time
between transmission of CSNPs for Level 1.
Intermediate System to Intermediate System (IS-IS)
905