Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 User Manual
Page 355
Brocade ICX 6650 Layer 3 Routing Configuration Guide
337
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Filtering
If you want to filter for a special character instead of using the special character as described in
on page 336, 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-bgp-router)#as-path-filter 2 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-bgp-router)#as-path-filter 2 deny \\
_
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. See 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. See 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 62
BGP4 special characters for regular expressions (Continued)
Character
Operation