Specifications

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Loss of frame
Loss of signal
Phase locked loop out of lock
Yellow alarm
Ethernet Management Ethernet disconnected.
5.5.3 Syslog
In JUNOS, you can turn on debugging at different levels using syslog and tracing
operations.
System logging operations use a syslog-like mechanism to record systemwide,
high-level operations, such as interfaces going up or down and users logging into
or out of the router. You configure these operations using the syslog statement at
the [edit system] hierarchy level and the options statement at the [edit routing-
options] hierarchy level.
System log files are located in the directory /var/log.
Tracing operations record more detailed messages about the operation of routing
protocols, such as the various type of routing protocol packets sent and received,
and routing policy actions. You configure tracing operations using the
traceoptions statement.
You can define tracing operations in different portions of the router configuration:
§ Global tracing operations - Define tracing for all routing protocols.
§ Protocol-specific tracing operations - Define tracing for a specific routing
protocol.
§ Tracing operations within individual routing protocol entities - Define more
granular tracing operations for some protocols.
§ Interface tracing operations - Define tracing operations for individual router
interfaces and for the interface process itself.
Trace files are located in the /var/log directory.
Example:
[edit protocols]
user@host# show
bgp {
traceoptions {
tracefile BGP-Events;
traceflag normal;
}
group external {
type external;
peer-as 54;
neighbor 11.1.1.1 {
traceoptions {
tracefile problem-neighbor;
traceflag damping detail;
}
}
}
}
Viewing Log messages :
user@host> show log filename
You can use the "monitor" command to view real-time information :
user@host> monitor (start | stop) filenames
5.5.4 End-to-end loopback diagnostics
5.5.4.1 ATM
When you are using an ATM encapsulation, you can configure the OAM F5
loopback cell period on virtual circuits, which is the interval at which OAM F5
loopback cells are transmitted.