Since a NOTIFICATION message at any
point can essentially close a peering relationship, network
administrators will need to evaluate these NOTIFICATION messages to
determine the specific error that caused the connection to reset.
Figure
illustrates the general message format.
The NOTIFICATION message is composed
of the Error code (1 byte), Error subcode (1 byte), and a Data field
(variable).
The Error code indicates the type of
the notification, the Error subcode provides more specific
information about the nature of the error, and the Data field
contains data relevant to the error (such as a bad header or illegal
AS number). Figure
lists possible errors and their subcodes.
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