Administrator Guide

Layer 3 Routing Commands 1334
• value — Specifies the site of origin extended community value. This value
can be entered in one of the following formats:
– 16-bit AS number :your 32-bit value (Ex : 100 :11)
– 32-bit IPv4 address :your 16-bit value (Ex : 10.1.1.1 :22
•
additive –Adds a route target to the exsisting route target list without
replacing any existing route targets.
Default Configuration
No site of origin extended community attributes are set.
Command Mode
Route Map Configuration mode
User Guidelines
The site of origin (SOO) extended communities attribute is configured with
the soo keyword. This attribute uniquely identifies the site from which the
Provider Edge (PE) router learned the route. All routes learned from a
particular site must be assigned the same SOO extended community
attribute, whether a site is connected to a single PE router or multiple PE
routers. Configuring this attribute prevents routing loops from occurring
when a site is multihomed. The SOO extended community attribute is
configured on the interface and is propagated into BGP through
redistribution. The SOO can be applied to routes that are learned from VRFs.
The SOO should not be configured for stub sites or sites that are not
multihomed.
Command History
Introduced in version 6.3.0.1 firmware.
Example
The following example shows how to set the extended community attribute
for site of origin with route-maps on the sending BGP router.
(R1)(Config)# ip extcommunity-list 10 permit
(R1)(config)# route-map RECV_IN permit 10
(R1)(config-route-map)# set extcommunity soo 10:10
(R1)(config-route-map)# exit
2CSNXXX_SWUM204.book Page 1334 Monday, January 25, 2016 1:25 PM