To filter on a specific single-character value, enter the character for the
as-path
parameter. For example, to filter on AS-paths that contain
the letter "z", enter the following command:
device(config-bgp-router)# ip as-path access-list acl1 permit z
To filter on a string of multiple characters, enter the characters in brackets. For example, to filter on AS-paths that contain "x", "y", or "z",
enter the following command.
device(config-bgp-router)# ip as-path access-list acl1 permit [xyz]
BGP4 Special characters
When you enter a single-character expression or a list of characters, you also can use the special characters listed in "Using regular
expressions." The description for each character includes an example. Some special characters must be placed in front of the characters
they control and others must be placed after the characters they control. The examples show where to place the special character.
TABLE 90
BGP4 special characters for regular expressions
Character
Operation
.
The period matches on any single character, including a blank space. For
example, the following regular expression matches for "aa", "ab", "ac", and
so on, but not just "a".
a.
*
The asterisk matches on zero or more sequences of a pattern. For
example, the following regular expression matches on an AS-path that
contains the string "1111" followed by any value:
1111*
+
The plus sign matches on one or more sequences of a pattern. For
example, the following regular expression matches on an AS-path that
contains a sequence of "g"s, such as "deg", "degg", "deggg", and so on:
deg+
?
The question mark matches on zero occurrences or one occurrence of a
pattern. For example, the following regular expression matches on an AS-
path that contains "dg" or "deg":
de?g
^
A caret (when not used within brackets) matches on the beginning of an
input string. For example, the following regular expression matches on an
AS-path that begins with "3":
^3
$
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
Filtering
FastIron Ethernet Switch Layer 3 Routing
404
53-1003627-04
Summary of Contents for FastIron SX 1600
Page 2: ...FastIron Ethernet Switch Layer 3 Routing 2 53 1003627 04 ...
Page 16: ...FastIron Ethernet Switch Layer 3 Routing 16 53 1003627 04 ...
Page 20: ...FastIron Ethernet Switch Layer 3 Routing 20 53 1003627 04 ...
Page 142: ...FastIron Ethernet Switch Layer 3 Routing 142 53 1003627 04 ...
Page 150: ...FastIron Ethernet Switch Layer 3 Routing 150 53 1003627 04 ...
Page 200: ...FastIron Ethernet Switch Layer 3 Routing 200 53 1003627 04 ...
Page 214: ...FastIron Ethernet Switch Layer 3 Routing 214 53 1003627 04 ...
Page 350: ...FastIron Ethernet Switch Layer 3 Routing 350 53 1003627 04 ...
Page 476: ...FastIron Ethernet Switch Layer 3 Routing 476 53 1003627 04 ...
Page 588: ...FastIron Ethernet Switch Layer 3 Routing 588 53 1003627 04 ...