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traceoptions (Protocols IS-IS)


Hierarchy Level


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


The traceoptions statement is not supported on QFabric systems.


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

  • layer2-map—Mapped ARP or neighbor discovery next hops in the kernel

  • ldp-synchronization—Synchronization between IS-IS and LDP

  • lsp—Link-state PDUs

  • 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

  • srv6—Segment routing for IPv6.

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—Provide detailed trace information.

  • receive—Trace the packets being received.

  • send—Trace the 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.

Release Information

Statement introduced before Junos OS Release 7.4.