Chapter 50
| IP Routing Commands
Policy-based Routing for BGP
– 1168 –
set extcommunity This command sets the extended community attributes of routing messages. Use
the no form to remove this entry from a route map.
Syntax
set extcommunity {rt extended-community-value |
soo extended-community-value}
no set extcommunity [rt | soo]
rt – The route target extended community attribute.
soo – The site of origin extended community attribute.
extended-community-value – The route target or site of origin in one of the
following formats:
AAAA:NN or AA:NNNN – Community-number to deny or permit. The
community number can either be formatted as a 4-byte autonomous
system number and a 2-byte network number, or as a 2-byte
autonomous system number and a 4-byte network number, separated
by one colon. Each 2-byte number can range from 0 to 65535, and 4-
byte numbers from 0 to 4294967295.
IP:NN – Community to deny or permit. The community number is
composed of a 4-byte IP address (representing the autonomous system
number) and a 2-byte network number, separated by one colon. The 2-
byte network number can range from 0 to 65535.
One or more community numbers can be entered, separated by a
space. Up to 3 community numbers are supported.
Command Mode
Route Map
Command Usage
â—† Using the rt keyword to specify new route targets replaces existing route
targets.
â—† The route target (RT) attribute is used to identify sites that may receive routes
tagged with a specific route target. Using this attribute allows that route to be
placed in per-site forwarding tables used for routing traffic received from the
corresponding sites.
â—† The site of origin (SOO) attribute is used to identify the site from which the
provider edge (PE) router learned the route. All routes learned from a particular
site are assigned the same site of origin attribute, no matter if a site is
connected to a single PE router or multiple PE routers. Filtering based on this
extended community attribute can prevent routing loops from occurring when
a site is multi-homed.
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