Brocade Communications Systems ICX 6650 Benutzerhandbuch

Filtering

The num:num parameter indicates a specific community number to filter. Use this parameter to 
filter for a private (administrator-defined) community. You can enter up to 20 community numbers 
with the same command.

If you want to filter for the well-known communities “LOCAL_AS”, “NO_EXPORT” or 
“NO_ADVERTISE”, use the corresponding keyword (described below). 

The internet keyword checks for routes that do not have the community attribute. Routes without a 
specific community are considered by default to be members of the largest community, the 
Internet.

The local-as keyword checks for routes with the well-known community “LOCAL_AS”. This 
community applies only to confederations. The Layer 3 switch advertises the route only within the 
sub-AS. For information about confederations, refer to 

The no-advertise keyword filters for routes with the well-known community “NO_ADVERTISE”. A 
route in this community should not be advertised to any BGP4 neighbors. 

The no-export keyword filters for routes with the well-known community “NO_EXPORT”. A route in 
this community should not be advertised to any BGP4 neighbors outside the local AS. If the router 
is a member of a confederation, the Layer 3 switch advertises the route only within the 
confederation. For information about confederations, refer to 

Defining a community ACL

To configure community ACL 1, enter a command such as the following.

Brocade(config)#ip community-list 1 permit 123:2

This command configures a community ACL that permits routes that contain community 123:2.

NOTE

Refer to 

 on page 345 for information about how to use a 

community list as a match condition in a route map. 

Syntax: ip community-list standard string [seq seq-value] deny | permit community-num

Syntax: ip community-list extended string [seq seq-value] deny | permit 

community-num | regular-expression

The string parameter specifies the ACL name. (If you enter a number, the CLI interprets the number 
as a text string.)

The standard or extended parameter specifies whether you are configuring a standard community 
ACL or an extended one. A standard community ACL does not support regular expressions whereas 
an extended one does. This is the only difference between standard and extended IP community 
lists.

The seq seq-value parameter is optional and specifies the community list sequence number. You 
can configure up to 199 entries in a community list. If you do not specify a sequence number, the 
software numbers them in increments of 5, beginning with number 5. The software interprets the 
entries in a community list in numerical order, beginning with the lowest sequence number.