Step 1: Display Summary Interface Information

Purpose

By displaying a summary of the interfaces on a router, you begin the process of isolating problems when they occur.

Action

To display a summary of all interfaces on a router or a specific group of interfaces, use one of the following JUNOS command-line interface (CLI) operational mode commands:

user@host> show interfaces terse

user@host> show interfaces terse interface-name

Sample Output

The following sample output shows all interfaces on a router:

user@host> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-5/0/0                up    down

t3-6/0/0                up    down

t3-6/0/1                up    down

t3-6/0/2                up    down

t3-6/0/3                up    down

at-6/1/0                up    down

fe-7/0/0                up    up  

fe-7/0/0.0              up    up   vpls 

fe-7/0/1                up    up  

fe-7/0/2                up    up  

fe-7/0/3                up    up  

t3-7/1/0                up    down

t3-7/1/1                up    down

t3-7/1/2                up    down

t3-7/1/3                up    down

dsc                     up    up  

fxp0                    up    up  

fxp0.0                  up    up   inet  10.168.4.32/24 

fxp1                    up    up  

fxp1.0                  up    up   tnp   4               

gre                     up    up  

ipip                    up    up  

lo0                     up    up  

lo0.0                   up    up   inet  127.0.0.1           --> 0/0

lsi                     up    up  

mtun                    up    up  

pimd                    up    up  

pime                    up    up  

tap                     up    up  

The following sample output is for a specific group of SONET interfaces on a router:

user@host> show interfaces terse so*

so-0/0/0        up    up

so-0/0/0.1      up    down inet  10.1.13.2/30

                           iso

so-0/0/0.2      up    down inet  10.1.23.2/30

                           iso

so-0/0/0.4      up    down inet  10.1.34.1/30

                           iso

so-0/0/0.5      up    up   inet  10.1.35.1/30

                           iso

so-0/0/1        up    up

so-0/0/2        up    up

so-0/0/3        up    up

                           iso

                           iso

                           iso

                           iso

                           iso

                           iso

47.0005.80ff.f800.0000.0108.0001.0102.5524.5219.00

What It Means

The sample output shows summary information about the interfaces on the router listed in order of type of interface. The information includes the name of the interface, whether it is turned on (up) or off (down), whether the state of the link is up or down, the protocol configured on the interface, the local address of the interface, and the address of the remote side of the connection if the interface is a point-to-point interface.