Check the Configuration of the VCI on an ATM2 IQ Interface

Purpose

If your configuration of the VCI is incorrect, the logical interface is not created.

Action

To check that VCI is configured correctly on your ATM2 IQ 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 ATM2 IQ interface:

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

atm-options {

    vpi 1 {

        maximum-vcs 200; <<< incorrectly included

    }

}

unit 100 {

    vci 1.100;

    family inet {

        address 25.25.25.1/30;

    }

}

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-0/1/0 

Interface               Admin Link Proto Local                 Remote

at-0/1/0                up    up  

<<< missing logical interface at-0/1/0.100

3. Delete the incorrect maximum-vcs statement from the configuration:

user@host> edit

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

user@host# delete maximum-vcs

user@host# show

user@host# commit

For example, the following output shows a correctly configured ATM2 IQ interface:

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

atm-options {

    vpi 1 {

    }

}

unit 100 {

    vci 1.100;

    family inet {

        address 25.25.25.1/30;

    }

}

4. Check that the logical interface 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 created:

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

Interface               Admin Link Proto Local                 Remote

at-0/1/0                up    up  

at-0/1/0.100            up    up   inet  25.25.25.1/30

What It Means

The steps above show that initially the logical interface at-0/1/0.100 is not created because the maximum-vcs statement is included in the ATM2 IQ configuration. When that statement is deleted, the logical interface is created.