Extreme Networks ExtremeWare XOS 11.1, Manual

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Policies and ACLs
ExtremeWare XOS 11.1 Concepts Guide
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Here are some additional examples of using regular expressions in the AS-Path statement.
The following AS-Path statement matches AS paths that contain only (begin and end with) AS number
65535:
as-path "^65535$"
The following AS-Path statement matches AS paths beginning with AS number 65535, ending with AS
number 14490, and containing no other AS paths:
as-path "^65535 14490$"
The following AS-Path statement matches AS paths beginning with AS number 1, followed by any AS
number from 2 - 8, and ending with either AS number 11, 13, or 15:
as-path "^1 2-8 [11 13 15]$"
The following AS-Path statement matches AS paths beginning with AS number 111 and ending with
any AS number from 2 - 8:
as-path "111 [2-8]$"
The following AS-Path statement matches AS paths beginning with AS number 111 and ending with
any additional AS number, or beginning and ending with AS number 111:
as-path "111 .?"
Policy Action Statements
Table 29 lists the possible action statements. These are the actions taken when the policy match
conditions are met in a policy entry.
Path of any length that begins with AS numbers 4, 5,
6 “4 5 6 .*” 4 5 6 4 5 6 7 8 9
Path of any length that ends with AS numbers 4, 5, 6 “.* 4 5 6 $” 4 5 6
1 2 3 4 5 6
Table 29: Policy actions
Action Description
as-path "<as_num> {<as_num1> <as_num2>
<as_num3> …. <as_numN>}"; Prepends the entire list of as-numbers to the as-path of
the route.
community [no-advertise | no-export | no-export-
subconfed | <community_num>
{<community_num1> <community_num2> ….
<community_numN>} | <as_num> :
<community_num> [<as_num1>
<community_num1> <as_num2>
<community_num2> ….}]; Replaces the existing community attribute of a route by
the communities specified by the action statement.
Communities must be enclosed in double quotes ("").
Table 28: Policy regular expression examples (Continued)
Attribute Regular Expression Example Matches