Check the Configuration of the VCI on an ATM1 Interface

Purpose

If your configuration of the virtual channel identifier (VCI) is incorrect, the logical interface is not created.

Action

To check that VCI is configured correctly on your ATM1 interface, follow these steps:

1. Check the configuration with the following JUNOS CLI operational mode command:

user@host> show configuration interfaces at-fpc/pic/port

For example, the following output shows an incorrectly configured ATM1 interface:

user@host> show configuration interfaces at-1/2/0

atm-options {

    vpi 1;

}         <<< the maximum-vcs statement is missing

unit 100 {

    vci 1.100;

    family inet {

        address 25.25.25.2/30;

    }

}

2. Check if the logical interface unit 100 is created with the following command:

user@host> show interfaces terse at-fpc/pic/port

For example, the following output shows that the link is not created:

user@host> show interfaces terse at-1/2/0 

Interface               Admin Link Proto Local                 Remote

at-1/2/0                up    up  

<<< missing logical interface at-1/2/0.100

3. Include the maximum-vcs statement in the configuration:

user@host> edit

user@host# edit interfaces interface-name atm-options vpi vpi-identifier 
maximum-vcs maximum-vcs

user@host# show

user@host# commit

For example, the following output shows a correctly configured ATM1 interface:

user@host> show configuration interfaces at-0/1/0

atm-options {

    vpi 1 {

        maximum-vcs 1024;

    }

}

unit 100 {

    vci 1.100;

    family inet {

        address 25.25.25.2/30;

    }

}

4. Check that the logical interface is created with the following command:

user@host> run show interfaces terse at-fpc/pic/port

For example, the following output shows that the link is created:

user@host# run show interfaces terse at-1/2/0

Interface               Admin Link Proto Local                 Remote

at-1/2/0                up    up  

at-1/2/0.100            up    up   inet  25.25.25.2/30 

What It Means

The steps above show that initially the logical interface at-1/2/0.100 is not created because the maximum-vcs statement is not included in the ATM1 configuration. When that statement is included, the logical interface is created.