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traceoptions (Protocols LDP)


Hierarchy Level


Specify LDP protocol-level trace options.


The default LDP protocol-level trace options are inherited from the routing protocols traceoptions statement included at the [edit routing-options] hierarchy level.


disable—(Optional) Disable the tracing operation. You can use this option to disable a single operation when you have defined a broad group of tracing operations, such as all.

file filename—Name of the file to receive the output of the tracing operation. Enclose the name within quotation marks. All files are placed in the directory ldp-log. We recommend that you place LDP tracing output in the file ldp-log.

files number—(Optional) Maximum number of trace files. When a trace file named trace-file reaches its maximum size, it is renamed trace-file.0, then trace-file.1, and so on, until the maximum number of trace files is reached. Then the oldest trace file is overwritten.

  • Range: 2 through 1000

  • Default: 2 files

If you specify a maximum number of files, you must also include the size statement to specify the maximum file size.

flag flag—Tracing operation to perform. To specify more than one tracing operation, include multiple flag statements.

  • address—Operation of address and address withdrawal messages

  • binding—Label-binding operations

  • error—Error conditions

  • event—Protocol events

  • initialization—Operation of initialization messages

  • label—Operation of label request, label map, label withdrawal, and label release messages

  • notification—Operation of notification messages

  • nsr-synchronization— Nonstop active routing synchronization events

  • p2mp-nsr-synchronization—Point-to-multipoint nonstop active routing synchronization events

  • packets—Equivalent to setting address, initialization, label, notification, and periodic flags (see also the filter flag modifier)

  • path—Label-switched path operations

  • periodic—Operation of hello and keepalive messages

  • route—Operation of route messages

  • state—Protocol state transitions

flag-modifier—(Optional) Modifier for the tracing flag. You can specify one or more of these modifiers:

  • detail—Provide detailed trace information.

  • disable—Disable this trace flag.

  • filter—Filter to apply to this flag. The filter flag modifier can be applied only to the route, path, and binding flags. This flag modifier has the following options:

    • match-on—Match on argument specified. The match-on option has the following suboptions:

      • address—Filter based on the source and destination addresses of packets. Available for the packets flag option only.

      • fec—Filter based on the FEC associated with the traced object.

    • policy policy-name—Specify the filter policy.

  • receive—Packets being received.

  • send—Packets being transmitted.

no-world-readable—(Optional) Prevent all users from reading the log file.

size size—(Optional) Maximum size of each trace file, in kilobytes (KB), megabytes (MB), or gigabytes (GB). When a trace file named trace-file reaches this size, it is renamed trace-file.0. When the trace-file again reaches this size, trace-file.0 is renamed trace-file.1 and trace-file is renamed trace-file.0. This renaming scheme continues until the maximum number of trace files is reached. Then the oldest trace file is overwritten.

  • Syntax: xk to specify KB, xm to specify MB, or xg to specify GB

  • Range: 10 KB through the maximum file size supported on your system

  • Default: 1 MB

If you specify a maximum file size, you must also include the files statement to specify the maximum number of files.

world-readable—(Optional) Enable any user to read the log file.

Required Privilege Level

routing and trace—To view this statement in the configuration.

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

Release Information

Statement introduced before Junos OS Release 7.4.

match-on address option for the filter flag modifier added in Junos OS Release 10.4.

nsr-synchronization and p2mp-nsr-synchronization operations for flag statement introduced in Junos OS Release 13.3.