Reference Guide

Usage
Information
Use this command to confirm that the neighbor adjacencies are operating correctly. If you
suspect that they are not, you can verify the specified area addresses of the routers by using
the show isis neighbors command.
The following describes the show isis neighbors command shown in the following
example.
Field Description
System Id The value that identifies a system in an area.
Interface The interface, slot, and port in which the router was discovered.
State The value providing status about the adjacency state. The range is
Up and Init.
Type This value displays the adjacency type (Layer 2, Layer 2 or both).
Priority IS-IS priority the neighbor advertises. The neighbor with highest
priority becomes the designated router for the interface.
Uptime Displays the interfaces uptime.
Circuit Id The neighbor’s interpretation of the designated router for the
interface.
Example
The bold sections below identify that Multi-Topology IS-IS is enabled.
FTOS#show isis neighbors
System Id Interface State Type Priority Uptime Circuit Id
TEST Gi 7/1 Up L1L2(M) 127 09:28:01 TEST.02
!
FTOS#show isis neighbors detail
System Id Interface State Type Priority Uptime Circuit Id
TEST Gi 7/1 Up L1L2(M) 127 09:28:04 TEST.02 Area Address(es):
49.0000.0001
IP Address(es): 25.1.1.3*
MAC Address: 0000.0000.0000
Hold Time: 28
Link Local Address: fe80::201:e8ff:fe00:492c
Topology: IPv4 IPv6 , Common (IPv4 IPv6 )
Adjacency being used for MTs: IPv4 IPv6
FTOS#
show isis protocol
Display IS-IS routing information.
S4820T
Syntax
show isis protocol
Command Modes
• EXEC
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