Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 393

On each VP, you can configure an interval during which to transmit loopback cells
by including the
oam-period
vpi vpi-identifier] hierarchy level:
[edit interfaces interface-name atm-options vpi vpi-identifier]
oam-period (disable | seconds);
When you add a VPI at the
automatically opened to send and receive OAM F4, VP-AIS, and VP-RDI cells. If you
enable OAM by including the
sends and receives OAM F4 loopback cells.
If the physical ATM interface is configured with encapsulation type
then F4 VCIs are not created, and F4 OAM processing is not performed for the VPIs
configured on that interface.
To modify OAM liveness values on a VP, include the
[edit interfaces interface-name atm-options vpi vpi-identifier]
[edit interfaces interface-name atm-options vpi vpi-identifier]
oam-liveness {
up-count cells;
down-count cells;
}
is the minimum number of consecutive OAM F4 loopback cells received on
up-count
a VPI before it is declared up.
is the minimum number of consecutive OAM F4 loopback cells lost before
down-count
a VPI is declared down.
When a VP-AIS or VP-RDI cell is received, the VPI is marked down. When a VP-AIS
cell is received on a VPI, a VP-RDI is generated and transmitted on the same VPI.
When an OAM F4 loopback request cell is received, the router sends a loopback reply
cell, even if the oam-period
When a VPI is marked down because the VPI receives VP-AIS, VP-RDI, VC-AIS, or
VC-RDI cells, or because the VPI does not receive down-count consecutive OAM F4
loopback replies, all the VCIs that belong to the VPI are marked down. When a VPI
is marked up, all the VCIs that belong to the VPI are marked up. The status of logical
interfaces is also changed when the status of the last VCI on that interface is changed.
For a configuration example, see "Example: Configuring ATM2 IQ Interfaces" on
page 360.
NOTE: For interfaces that are configured for cell-relay promiscuous virtual path
identifier (VPI) mode, the
cell statistics.
statement at the
[edit interfaces interface-name atm-options
atm-options hierarchy, an end-to-end F4 VCI is
statement in the configuration, the router
oam-period
statement is not included in the configuration of the VPI.
command output does not show (OAM) F4
show interfaces
Configuring the OAM F4 Cell Flows
Chapter 13: Configuring ATM Interfaces
atm-ccc-cell-relay
statement at the
oam-liveness
hierarchy level:
,
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