Configuring F5 OAM

F5 OAM flows run over existing PVCs. The ATM interface does not support sending F5 segment loopback cells, but it does respond to F5 segment loopback cells that it receives.

Note: You cannot enable both loopback cells and CC cells at the same time.

To set up F5 OAM:

1. To enable VC integrity, which causes the ATM interface to periodically send F5 end-to-end loopback cells over a VC, use the oam keyword with the atm pvc command.

   You can include the frequency (in seconds) with which the router sends F5 end-to-end loopback cells.

   host1(config-if)#atm pvc 98 38 22 aal5snap oam 300

2. (Optional) To enable CC cell flows on a circuit, use the cc keyword with the atm pvc command. You can enable cell flows on a segment or end-to-end basis, and you can enable the PVC as a sink, source, or both a sink and a source.

   host1(config-if)#atm pvc 50 0 50 aal5snap oam cc end-to-end sink

When you issue the appropriate shutdown command to change the administrative status of the corresponding ATM interface, ATM AAL5 interface, or ATM 1483 subinterface from enabled to disabled, the router automatically disables all F5 OAM services configured on the associated VC. For more information, see Automatic Disabling of F5 OAM Services.

atm pvc

• Use the atm pvc command with the oam keyword to set up the PVC to periodically transmit F5 end-to-end loopback cells over a VC.
• You can use the oam keyword only if you specify one of the following encapsulation types:
  • aal5snap
  • aal5mux ip
  • aal5autoconfig
• The oam keyword is not available with the aal5all, aal0, or ilmi
• Optionally, you can configure the time interval in the range 1–600 seconds between transmissions of OAM F5 end-to-end loopback cells.
• Use the following keywords to enable and configure CC cell flows:
  • end-to-end—Opens an end-to-end CC cell flow
  • segment—Opens a segment CC cell flow
  • sink—Enables this VC as a sink point (cell receiver)
  • source—Enables this VC as the source point (cell generator)
  • both—Enables this VC as both a sink point and a source point
• Example 1—Enables F5 end-to-end loopback cells

  host1(config-if)#atm pvc 20 20 20 aal5snap oam

• Example 2—Enables end-to-end CC cell flow and enables the PVC as the sink

  host1(config-if)#atm pvc 5 0 5 aal5autoconfig oam cc end-to-end sink

• Use the no version of the atm pvc command without the oam keyword to disable F5 OAM on the PVC and without the cc keyword to disable CC cell flows on the PVC. For example, the following command disables CC cell flow configured in Example 2.

  host1(config-if)#no atm pvc 5 0 5 aal5autoconfig

• See atm pvc.

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