Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 219)

Configuring BGP Services

5-15

Notiﬁcation Message

The notiﬁcation message is sent whenever a condition is detected that causes a

BGP speaker to terminate a connection. The BGP connection is closed after the

notiﬁcation is transmitted. In addition to the message header, the Notiﬁcation

message includes the following ﬁelds:

• The Error Code, which indicates the type of notiﬁcation

• The Error Subcode, which further speciﬁes the reported error conditions

[c...] As the rightmost element in a string, this element tells the ﬁlter to

match

any one

of the characters enclosed in the brackets

To use ‘[‘ (a left bracket) as one of the characters to be matched, make

it the ﬁrst character in the string, and follow it with a right bracket, as

shown in the following example:

Having [abcxyz] as the rightmost element in the ﬁlter expression

matches a single character from the set “abcxyz.”

The expression:

[]abc]

matches any of the characters ‘]’, ‘a’, ‘b’, or ‘c’.

[^c...] When a caret is the ﬁrst character of the enclosed string, the ﬁlter

expression matches any character

except

those in the remainder of

the string. For example, the expression [^45678] matches any

character except 4, 5, 6, 7, or 8

To include a ‘] ‘(right bracket] in the string of ﬁltered characters, place it

directly after the caret. For example, the expression [^] abc] matches

every character except ‘]’, ‘a’, ‘b’, or ‘c’.

[l-r] The minus sign between two characters indicates a range of

consecutive ASCII characters to match. This bracketed string of

characters is known as a

character class

. For example, the range:

[0-9]

is equivalent to the string:

[0123456789]

The

- (minus sign) is treated as an ordinary character if it occurs ﬁrst,

ﬁrst after an initial caret, or last in a string.

Table 5-3. Characters in AS Path Pattern Matching

(continued)

Filter Character Function

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