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Tracing IS-IS Protocol Traffic

To trace IS-IS protocol traffic, you can specify options in the global traceoptions statement included at the [edit routing-options] hierarchy level, and you can specify IS-IS–specific options by including the traceoptions statement:




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

For a list of hierarchy levels at which you can configure this statement, see the statement summary section for this statement.

You can specify the following IS-IS–specific trace options in the IS-IS flag statement:

all—Everything
csn—Complete sequence number PDU (CSNP) packets
error—Errored packets
general—General events
hello—Hello packets
lsp—Link-state PDU (LSP) packets
lsp-generation—Link-state PDU generation packets
normal—Normal events
packets—All IS-IS protocol packets
policy—Policy processing
psn—Partial sequence number PDU (PSNP) packets
route—Routing information
spf—Shortest-path-first (SPF) calculations
state—State transitions
task—Routing protocol task processing
timer—Routing protocol timer processing

You can optionally specify one or more of the following flag modifiers:

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

Note: Use the trace flags detail and all with caution. These flags may cause the CPU to become very busy.

For information about tracing and global tracing options, see Tracing Global Routing Protocol Operations.

Examples: Tracing IS-IS Protocol Traffic

A common configuration traces SPF calculations, LSP calculations, normal protocol operations, and errors in protocol operation:



[edit]
protocols {


isis {


traceoptions {
file isis-log size 1m files 10;
flag spf;
flag lsp;
flag error;
flag normal;
}


}


}

Trace only unusual or abnormal operations to the file routing-log, and trace detailed information about all IS-IS packets to the file isis-log:



[edit]
routing-options {


traceoptions {
file routing-log;
}


}
protocols {


isis {


traceoptions {
file isis-log size 10k files 5;
flag csn detail;
flag hello detail;
flag lsp detail;
flag psn detail;
}


}


}

Perform detailed tracing of mesh-group flooding:



[edit]
protocols {


isis {


traceoptions {
file isis-log;
flag lsp detail;
}


}


}

IS-IS LSP packets that contain errors are discarded by default. To log these errors, specify the error tracing operation:



[edit]
protocols {


isis {


traceoptions {
file isis-log;
flag error;
}


}


}

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