Dell Force10 C150 Configuration Manual page 250

Manipulate the COMMUNITY attribute
In addition to permitting or denying routes based on the values of the COMMUNITY attributes, you can
manipulate the COMMUNITY attribute value and send the COMMUNITY attribute with the route
information.
By default, FTOS does not send the COMMUNITY attribute.
Use the following command in the CONFIGURATION ROUTER BGP mode to send the COMMUNITY
attribute to BGP neighbors.
Command Syntax
neighbor {
ip-address
} send-community
peer-group-name
To view the BGP configuration, use the
mode.
If you want to remove or add a specific COMMUNITY number from a BGP path, you must create a route
map with one or both of the following statements in the route map. Then apply that route map to a BGP
neighbor or peer group. Use these commands in the following sequence, starting in the
CONFIGURATION mode:
Step Command Syntax
route-map
1
[ permit | deny ]
[
sequence-number
set comm-list
2
community-list-name
set community
{
community-number
local-as | no-advertise |
no-export | none }
250 | Border Gateway Protocol IPv4 (BGPv4)
Command Mode
| CONFIG-ROUTER-
BGP
Command Mode
map-name CONFIGURATION
]
CONFIG-ROUTE-MAP
delete
CONFIG-ROUTE-MAP
|
Purpose
Enable the software to send the router's
COMMUNITY attribute to the BGP neighbor or
peer group specified.
show config
command in the CONFIGURATION ROUTER BGP
Purpose
Enter the ROUTE-MAP mode and assign a name
to a route map.
Configure a set filter to delete all COMMUNITY
numbers in the IP Community list.
Configure a Community list by denying or
permitting specific community numbers or types
of community
• community-number:
where AA is the AS number (2 or 4 Bytes)
and NN is a value specific to that autonomous
system.
local-AS : routes with the COMMUNITY
•
attribute of NO_EXPORT_SUBCONFED
and are not sent to EBGP peers.
no-advertise: routes with the
•
COMMUNITY attribute of
NO_ADVERTISE and are not advertised.
no-export: routes with the COMMUNITY
•
attribute of NO_EXPORT.
none: remove the COMMUNITY attribute.
•
additive: add the communities to already
•
existing communities.
use AA:NN format