Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


log-updown (Protocols MPLS)


Hierarchy Level


Log a message or send an SNMP trap whenever an LSP makes a transition from up to down, or vice versa, and whenever an LSP switches from one active path to another. Only the ingress router performs these operations.


System log messages for LSPs are generated by default. To disable the default logging of messages for LSPs, configure the no-syslog option under the log-updown statement.


There is no default behavior for this statement. If you do not specify the options, the configuration cannot be committed.


no-syslog—Do not log a message to the system log file.

no-trap—Do not send an SNMP trap.

syslog—Log a message to the system log file.

trap—Send an SNMP trap.

trap-path-down—Send an SNMP trap when an LSP path goes down.

trap-path-up—Send an SNMP trap when an LSP path comes up.

The no-trap statement is explained separately.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.The mpls-lsp-traps and rfc-3812-traps options added in Junos OS Release 9.0.