3com MSR 20-20 참조 매뉴얼

System view

as-path-number: AS path ACL number, in the range of 1 to 256.

deny: Specifies the matching mode for the AS path ACL as deny.

permit: Specifies the matching mode for the AS path ACL as permit.

regular-expression: Regular expression of AS path, a string of 1 to 50 characters.

BGP routing information contains the AS path attribute field that identifies the 
autonomous systems through which routing information has passed. Used to 
compare with the AS path attribute, a regular expression is a formula comprised of 
characters, for example, ^200. *100$, which matches AS path attribute fields that 
start with AS200 and end with AS100.

The meanings of special characters used in regular expressions are shown below:

Use the ip as-path command to create an AS path ACL.

Use the undo ip as-path command to remove an AS path ACL.

No AS path ACL is created by default.

# Create an AS path ACL numbered 1, permitting routing information whose 
AS_PATH starts with 10.

<Sysname> system-view

[Sysname] ip as-path 1 permit ^10 

ip community-list basic-comm-list-num { deny | permit } [ community-number-list ] 
[ internet | no-advertise | no-export | no-export-subconfed ] *

undo ip community-list basic-comm-list-num [ community-number-list ] [ internet | 
no-advertise | no-export | no-export-subconfed ] *

. 

Matches any single character, including blank space. 

* 

Matches 0 or more patterns. 

+ 

Matches 1 or more patterns. 

^ 

Matches the beginning of an input string. 

$ 

Matches the end of an input string. 

_ 

Matches a comma, left brace, right brace, left parenthesis, right 
parenthesis, the beginning of an input string, the end of an input 
string, or a space. 

[ range ] 

Means the range of single-character patterns. 

- 

Separates the ending points of a range.