Juniper BGP - CONFIGURATION GUIDE V 11.1.X

Figure 97: Preventing Potential Routing Loops in the Network
neighbor site-of-origin ■ Use to set a site of origin that is included in the extended community list for
routes received from the specified peer.
■ If you use this command to configure a site of origin for routes from a peer, then
routes advertised to that peer that contain this site of origin are filtered out and
not advertised. This behavior is followed regardless of whether the neighbor
send-community extended command has been issued for the peer.
■ The configured site of origin does not override the site of origin if it is already
present in the extended community list of a route.
■ If you specify a BGP peer group by using the peer-group-name argument, all the
members of the peer group inherit the characteristic configured with this
command. You cannot override the characteristic for a specific member of the
peer group.
■ The site of origin is applied to all routes that are received or advertised to all
after you issue the command. The session is not bounced.
■ To apply the new policy to routes that are already present in the BGP routing
table, you must use the clear ip bgp command to perform a soft clear or hard
clear of the current BGP session.
■ Example
host1(config-router)#neighbor 10.25.32.4 site-of-origin 200:21
■ Use the no version to remove the site of origin for routes received from the peer.
■ See neighbor site-of-origin.
450 ■ Configuring BGP VPN Services
JUNOSe 11.1.x BGP and MPLS Configuration Guide