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traceoptions {file name <size size> <files number> <world-readable | no-world-readable>;flag flag <flag-modifier> <disable>;}

Hierarchy Level

[edit logical-systems logical-system-name protocols isis],[edit logical-systems logical-system-name routing-instances routing-instance-name protocols isis],[edit protocols isis],[edit routing-instances routing-instance-name protocols isis]

Release Information

Statement introduced before JUNOS Release 7.4.

Statement introduced in JUNOS Release 9.0 for EX Series switches.


Configure IS-IS protocol-level tracing options. To specify more than one tracing operation, include multiple flag statements.


The default IS-IS protocol-level tracing options are those 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 name—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 /var/log. We recommend that you place IS-IS tracing output in the file isis-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 also must specify a maximum file size with the size option.

Range: 2 through 1000 files
Default: 10 files

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

IS-IS Protocol-Specific Tracing Flags

  • csn—Complete sequence number PDU (CSNP) packets
  • error—Errored IS-IS packets
  • graceful-restart—Graceful restart operation
  • hello—Hello packets
  • ldp-synchronization—Synchronization between IS-IS and LDP
  • lsp—Link-state PDU packets
  • lsp-generation—Link-state PDU generation packets
  • packets—All IS-IS protocol packets
  • psn—Partial sequence number PDU (PSNP) packets
  • spf—Shortest-path-first calculations

Global Tracing Flags

  • all—All tracing operations
  • general—A combination of the normal and route trace operations
  • normal—All normal operations, including adjacency changes
Default: If you do not specify this option, only unusual or abnormal operations are traced.
  • policy—Policy operations and actions
  • route—Routing table changes
  • state—State transitions
  • task—Routing protocol task processing
  • timer—Routing protocol timer processing

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

  • detail—Detailed trace information
  • receive—Packets being received
  • send—Packets being transmitted

no-world-readable—(Optional) Prevent any user 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 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.
Note that if you specify a maximum file size, you also must 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: 128 KB

world-readable—(Optional) Allow 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.

Published: 2010-04-14

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