Step 4: Verify Protocol Families

Purpose

If a logical interface does not have MPLS enabled, it cannot perform MPLS switching. This step allows you to quickly determine which interfaces are configured with MPLS and other protocol families.

Action

To verify the protocol families configured on the routers in your network, enter the following JUNOS CLI operational mode command:

user@host> show interfaces terse

Sample Output 1

user@R1> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.12.1/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.15.1/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.13.1/30    

                                   iso  

                                   mpls 

so-0/0/3                up    down

user@R2> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.12.2/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.23.1/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.26.1/30    

                                   iso  

                                   mpls 

so-0/0/3                up    up  

so-0/0/3.0              up    up   inet  10.1.24.1/30    

                                   iso  

                                   mpls 

user@R3> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.34.1/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.23.2/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.13.2/30    

                                   iso  

                                   mpls 

so-0/0/3                up    up  

so-0/0/3.0              up    up   inet  10.1.36.1/30    

                                   iso  

                                   mpls 

user@R4> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.34.2/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.46.1/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.45.1/30    

                                   iso  

                                   mpls 

so-0/0/3                up    up  

so-0/0/3.0              up    up   inet  10.1.24.2/30    

                                   iso  

                                   mpls 

user@R5> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.56.1/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.15.2/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.45.2/30    

                                   iso  

                                   mpls 

so-0/0/3                up    down

user@R6> show interfaces terse

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.56.2/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.46.2/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.26.2/30    

                                   iso  

                                   mpls 

so-0/0/3                up    up  

so-0/0/3.0              up    up   inet  10.1.36.2/30    

                                   iso  

                                   mpls 

Sample Output 2

user@R6> show interfaces terse 

Interface               Admin Link Proto Local                 Remote

so-0/0/0                up    up  

so-0/0/0.0              up    up   inet  10.1.56.2/30    

                                   iso  

                                   mpls 

so-0/0/1                up    up  

so-0/0/1.0              up    up   inet  10.1.46.2/30    

                                   iso  

                                   mpls 

so-0/0/2                up    up  

so-0/0/2.0              up    up   inet  10.1.26.2/30    

                                   iso              #The mpls statement is missing.

so-0/0/3                up    up  

so-0/0/3.0              up    up   inet  10.1.36.2/30    

                                   iso  

                                   mpls 

What It Means

Sample Output 1 shows the interface, the administrative status of the link (Admin), the data link layer status of the link (Link), the protocol families configured on the interface (Proto), and the local and remote addresses on the interface.

All interfaces on all routes in the network shown in Figure 5 are administratively enabled and functioning at the data link layer with MPLS and IS-IS, and have an inet address. All are configured with an IPv4 protocol family (inet), and have the IS-IS (iso) and MPLS (mpls) protocol families configured at the [edit interfaces type-fpc/pic/port unit number] hierarchy level.

Sample Output 2 shows that interface so-0/0/2.0 on R6 does not have the mpls statement included at the [edit interfaces type-fpc/pic/port unit number] hierarchy level. For information on how to configure MPLS on an interface, see Configuring MPLS on a Network.