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100

101

Using Syslog Messaging to Monitor Router Events

308657-14.00 Rev 00

C-9

Syslog retrieves the variables shown in brackets ([ ]) from the router’s system log

message or from the host table. The next sections describe the variables for:

•IP header

• UDP header

• UDP data

• Priority code

IP Header

When an event message passes all filtering criteria, syslog adds the destination IP

address for a specific remote host.

UDP Header

When an event message passes all filtering criteria, syslog adds the destination

UDP port number on the remote host identified in the IP header.

UDP Data

The UDP data field in the Syslog packet contains a reformatted router event

message, plus a priority code required by the remote host. The remote host uses

this information to decide how to handle messages received from a router.

Priority Code

The example of a priority code and its text (Figure C-4

) consists of a facility code

plus an error level code (in the form facility.error).

Figure C-4. Syslog Message Composition

11111

Priority code = Facility level

Facility code = 23

Error level code = 7

TS0004B

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