Technical data

Using Technician Interface Software
C-10
303561-A Rev 00
UDP Header
Syslog adds to any event message that passes all filtering criteria 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 on 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
The facility code identifies a standard UNIX system facility that receives a
message from an internal or external software entity. The “Local <0-7>” UNIX
system facilities receive event messages (in Syslog format) from routers in your
network. The following table relates UNIX system facility names to their
respective facility codes on a workstation.
11111
11
0
Priority code = Facility level
Facility code = 23
10
Error level code = 7
10
TS0004B