Specifications

Switch Protection
ExtremeWare XOS 11.0 Concepts Guide 161
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 .?"
Table 32: Policy regular expression examples
Attribute Regular Expression Example Matches
AS path is 1234 “1234” 1234
Zero or more occurrences
of AS number 1234
“1234*” 1234
1234 1234
Start of As path set “10 12 { 34” 10 12 34 { 99
33 10 12 { 34 37
End of As path set “12 } 34” 12 } 34 56
Path that starts with 99
followed by 34
“^99 34 “ 99 34 45
Path that ends with 99 “99 $” 45 66 99
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