Site of Origin BGP Community Attribute
The site-of-origin (SoO) extended community is a BGP extended community
attribute that is used to identify routes that have originated from a
site so that the readvertisement of that prefix back to the source site
can be prevented. The SoO extended community uniquely identifies the
site from which a router has learned a route. BGP can use the SoO value
associated with a route to prevent routing loops.
BGP per Neighbor Site of Origin Configuration
There are three ways to configure an SoO value for a BGP neighbor:
•
BGP
peer policy template—A peer policy template is created, and an SoO
value is configured as part of the peer policy. Under address family
IPv4 VRF, a neighbor is identified and is configured to inherit the peer
policy that contains the SoO value.
BGP
peer policy template—A peer policy template is created, and an SoO
value is configured as part of the peer policy. Under address family
IPv4 VRF, a neighbor is identified and is configured to inherit the peer
policy that contains the SoO value.
•BGP neighbor command—Under address family IPv4 VRF, a neighbor is identified, and an SoO value is configured for the neighbor.
BGP neighbor command—Under address family IPv4 VRF, a neighbor is identified, and an SoO value is configured for the neighbor.
•BGP
peer group—Under address family IPv4 VRF, a BGP peer group is
configured, an SoO value is configured for the peer group, a neighbor is
identified, and the neighbor is configured as a member of the peer
group.
BGP
peer group—Under address family IPv4 VRF, a BGP peer group is
configured, an SoO value is configured for the peer group, a neighbor is
identified, and the neighbor is configured as a member of the peer
group. 
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