Brocade Multi-Service IronWare Routing Configuration Guide Instrukcja Użytkownika Pobierz pdf (Strona 106)

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Filtering

To filter for a special character instead of using the special character as described in Table 4, enter

“\” (backslash) in front of the character. For example, to filter on AS-path strings containing an

asterisk, enter the asterisk portion of the regular expression as “\*”.

Brocade(config-/jointfilesconvert/1441120/bgp)# ip as-path access-list acl2 deny \*

To use the backslash as a string character, enter two slashes. For example, to filter on AS-path

strings containing a backslash, enter the backslash portion of the regular expression as “\\”.

Brocade(config-/jointfilesconvert/1441120/bgp)# ip as-path access-list acl2 deny \\

Filtering communities

You can filter routes received from BGP4 neighbors based on community names.

$ A dollar sign matches on the end of an input string. For example, the following regular expression

matches on an AS-path that ends with “deg”:

deg$

_ An underscore matches on one or more of the following:

• , (comma)

• { (left curly brace)

• } (right curly brace)

• ( (left parenthesis)

• ) (right parenthesis)

• The beginning of the input string

• The end of the input string

• A blank space

For example, the following regular expression matches on “100” but not on “1002”, “2100”, and

so on.

_100_

[ ] Square brackets enclose a range of single-character patterns. For example, the following regular

expression matches on an AS-path that contains “1”, “2”, “3”, “4”, or “5”:

[1-5]

You can use the following expression symbols within the brackets. These symbols are allowed

only inside the brackets:

• ^ – The caret matches on any characters except the ones in the brackets. For example, the

following regular expression matches on an AS-path that does not contain “1”, “2”, “3”, “4”,

or “5”:

[^1-5]

• - The hyphen separates the beginning and ending of a range of characters. A match occurs

if any of the characters within the range is present. Refer to the example above.

| A vertical bar (sometimes called a pipe or a “logical or”) separates two alternative values or sets

of values. The AS-path can match one or the other value. For example, the following regular

expression matches on an AS-path that contains either “abc” or “defg”:

(abc)|(defg)

NOTE: The parentheses group multiple characters to be treated as one value. Refer to the

following row for more information about parentheses.

( ) Parentheses allow you to create complex expressions. For example, the following complex

expression matches on “abc”, “abcabc”, or “abcabcabcdefg”, but not on “abcdefgdefg”:

((abc)+)|((defg)?)

TABLE 4 BGP4 special characters for regular expressions (Continued)

Character Operation

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 845 846

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