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traceoptions (Multicast Snooping Options)


Hierarchy Level


Set multicast snooping tracing options.


Tracing operations are disabled.


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

file name—Name of the file to receive the output of the tracing operation. Enclose the name in quotation marks. We recommend that you place multicast snooping tracing output in the file /var/log/multicast-snooping-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.

If you specify a maximum number of files, you must also specify a maximum file size with the size option.

  • Range: 2 through 1000 files

  • Default: 1 trace file only

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

The following are the tracing options:

  • all—All tracing operations

  • config-internal—Trace configuration internals.

  • general—Trace general events.

  • normal—All normal events.

  • Default: If you do not specify this option, only unusual or abnormal operations are traced.

  • parse—Trace configuration parsing.

  • policy—Trace policy operations and actions.

  • route—Trace routing table changes.

  • state—Trace state transitions.

  • task—Trace protocol task processing.

  • timer—Trace protocol task timer processing.

no-world-readable—(Optional) Prevent any user from reading the log file.

size size—(Optional) Maximum size of each trace file, in kilobytes (KB) or megabytes (MB). When a trace file named trace-file reaches this size, it is renamed trace-file.0. When the trace-file again reaches its maximum 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.

If you specify a maximum file size, you must also specify a maximum number of trace files with the files option.

  • 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

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

Required Privilege Level

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

Release Information

Statement introduced in Junos OS Release 8.5.