Monitor ATM Interfaces

Purpose

By monitoring ATM interfaces, you begin the process of isolating ATM interface problems when they occur. The following command provides the status of all ATM interfaces on the router. See Determine ATM Interface Type for information on how to determine the ATM interface type.

Action

To display the status of all ATM interfaces, use the following JUNOS command-line interface (CLI) operational mode command:

user@host> show interfaces terse at*

Sample Output

The following sample output is for an ATM1 interface:

user@host> show interfaces terse at* 

Interface                             Admin Link Proto Local                 Remote

at-2/0/0                up    up  

at-2/2/0.100            up    up   inet  10.16.5.1/24

at-2/2/0.101            up    up   inet  10.16.250.253/30

at-2/2/0.200            up    up   inet  20.20.20.1/30

at-2/2/0.300            up    up   inet  30.30.30.1/30

at-2/2/0.400            up    up   inet  40.40.40.1/30

at-2/2/0.32767          up    up 

at-2/0/1                up    down

at-2/0/1.10                            up    down inet  10.10.100.1/30

What It Means

The sample output lists only the ATM interfaces and shows the status of both the physical and logical interfaces. See Table 20 for a description of what the output means. You cannot determine from this output whether the interfaces are ATM1 or ATM2 intelligent queuing (IQ). See Determine ATM Interface Type for information on how to determine the ATM interface type.

Table 20: Status of ATM Interfaces

Physical Interface	Logical Interface	Status Description
at-2/0/0 Admin Up Link Up	at-2/0/0.100 Admin Up Link Up	Both the physical and logical links are up and running on this interface. By default on an ATM interface, if the physical link is up, the logical link is also up. However, for ATM 1 or ATM2 IQ interfaces with an ATM encapsulation and OAM configured for the VC, even if the physical interface is up, the logical link for a VC can be down due to a VC misconfiguration.
at-2/0/1 Admin Up Link Down	at-2/0/1.10 Admin Up Link Down	The physical link is down on this interface and therefore the logical interface is down also.