Configuring ATM > Creating an OAM F4 Circuit

Creating an OAM F4 Circuit

ATM interfaces support OAM (operations, administration, and management) standards. OAM provides VC/VP integrity and fault and performance management.

E-series routers support F4 and F5 ATM OAM fault management, loopback, and continuity check (CC) cells. These cells perform fault detection and notification, loopback testing, and link integrity.

You can create two types of OAM F4 circuits:

• Segment—End of a connection segment
• End-to-end—End of a VC/VP connection where the ATM cells are terminated

Within these two types of OAM F4 circuits, you can set how cells are sent:

• Continuity check—CC cells provide continual monitoring of a connection on a segment or end-to-end basis. The CC cell source generates the CC cells, and the sink receives and processes the cells. You can configure a VP or VC as the source, the sink, or both the source and the sink. If you enable a VP or VC as a CC cell source, it generates CC cells.
• Loopback—Use loopback cells to verify connectivity between VP/VC endpoints, as well as segment endpoints within the VP/VC. You can use these tests to perform fault isolation over the VP/VC.

The ATM interface also supports ATM ping, which lets you check whether a connection endpoint or segment point can be reached on a VC or VP. See Pinging from an ATM Circuit or OAM F4 Circuit.

For more detailed information about OAM F4 circuits, see JUNOSe Link Layer Configuration Guide, Chapter 1, Configuring ATM.

To create an OAM F4 circuit:

1. Navigate to the ATM interface in the list area.
2. Select an interface, right-click, select create, and click the type of OAM F4 circuit you want to create (end-to-end or segment).

Depending on your choice, either the Create OAM F4 Circuit (Segment) or Create OAM F4 Circuit (End-to-End) dialog box appears.

3. Set the OAM F4 circuit parameters (Table 58).

 Table 58:  OAM F4 Circuit Parameters  

 Parameter
 Description

 Name

 Identification of OAM F4 circuit; generated automatically


 VPI

 Virtual path identifier of the selected circuit; can edit during creation only; range depends on VCS per VPS setting on ATM interface
 Must be unique across all OAM F4 circuits of the same type on a single ATM interface


 Cell Characteristics

 Type

 Determines type of cells sent:

  
 Default
  
 Continuity Check—Sends and receives CC cells. No more than 12 OAM F4 circuits are allowed on a single ATM interface when this type is selected.
  
 Loopback—Sends loopback cells (available only for end-to-end circuits)



 Continuity Check
 


 Sink

 Select to receive CC cells


 Source

 Select to send CC cells


 Loopback

 Timer (sec)

 Set frequency at which loopback cells are sent; 0-600 seconds



 

4. Click OK.