Reference Guide

Usage
Information
To perform protocol-support consistency checks on hello packets, use this command. The
adjacency-check is enabled by default.
advertise
Leak routes between levels (distribute IP prefixes between Level 1 and Level 2 and vice versa).
S4820T
Syntax
advertise {level1-into-level2 | level2-into-level1} prefix-
list-name
To return to the default, use the no advertise {level1-into-level2 | level2-
into-level1}[
prefix-list-name] command.
Parameters
level1-into-level2 Enter the keywords level1-into-level2 to advertise Level 1
routes into Level 2 LSPs. This setting is the default.
level2-into-level1 Enter the keywords level2-into-level1 to advertise Level 2
inter-area routes into Level 1 LSPs. This behavior is described in RFC
2966.
prefix-list-name Enter the name of a configured IP prefix list. Routes meeting the
criteria of the IP Prefix list are leaked.
Defaults level1-into-level2 (Level 1 to Level 2 leaking 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 Added IPv6 ISIS support.
Version 6.3.1.0 Version 6.3.1.0 Introduced
Usage
Information
You cannot disable leaking from one level to another; however, you can regulate the rate flow
from one level to another using an IP Prefix list. If you do not configure the IP Prefix list, all
routes are leaked.
You can find more information in IETF RFC 2966, Domain-wide Prefix Distribution with Two-
Level IS-IS .
756