Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 218)

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101

Configuring IP Services

5-14

BGP-4 accept and announce policies allow you to specify a match for an AS

number in an AS path. To specify the position of the AS in the path, you supply a

regular expression using the characters described in Table 5-3.

Table 5-3. Characters in AS Path Pattern Matching

Filter Character Function

C Matches any character, except those listed below. An ordinary

character (like a, b, 7, or q) matches only itself.

\ (Backslash) Escape character. Use this to match a special character that would

otherwise have special meaning to the software. You must enclose the

special character to be matched in single quotes following the

backslash character. The special character that require quoting to

match themselves are:

\ (backslash)

. (dot or period)

^ (caret or circumﬂex, as the ﬁrst character in the string)

$ (currency symbol, as the last

character in the string)

[ (left bracket)

? (question mark)

* (asterisk)

{ (left brace)

( (left parenthesis)

) (right parenthesis)

| (vertical bar)

Any other quoted character following a backslash matches itself.

For example, to match a backslash (\) in a string, include the following

in the ﬁlter expression:

\’\’

. (Dot or period) Matches a single character.

^ (Caret or

circumﬂex)

The caret or circumﬂex has special meaning

only

when it’s the

leftmost

character in the ﬁlter expression. As such, it constrains the expression

to match the leftmost portion of a line. A match of this type is called an

“anchored match,” because it is anchored to a speciﬁc place in the line.

$ (Currency

symbol)

The currency symbol has special meaning

only

when it’s the

rightmost

character in the ﬁlter expression. As such, it constrains the expression

to match the rightmost portion of a line. A match of this type is called

an “anchored match,” because it is anchored to a speciﬁc place in the

line.

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