Extreme Networks ExtremeWare XOS Guide Manual page 282

Routing Policies
Table 37: AS regular expression notation (Continued)
Character
(
)
Table 38: Policy regular expression examples
Attribute
AS path is 1234
Zero or more occurrences of AS number 1234
Start of As path set
End of As path set
Path that starts with 99 followed by 34
Path that ends with 99
Path of any length that begins with AS numbers 4, 5,
6
Path of any length that ends with AS numbers 4, 5, 6
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 .?"
282
Definition
Start of a confederation segment in the AS path
End of a confederation segment in the AS path
Regular Expression
"1234"
"1234*"
"10 12 { 34"
"12 } 34"
"^99 34 "
"99 $"
"4 5 6 .*"
".* 4 5 6 $"
ExtremeWare XOS 11.3 Concepts Guide
Example Matches
1234
1234
1234 1234
10 12 34 { 99
33 10 12 { 34 37
12 } 34 56
99 34 45
45 66 99
4 5 6 4 5 6 7 8 9
4 5 6
1 2 3 4 5 6