Figure 97: Preventing Potential Routing Loops In The Network - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BGP AND MPLS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

Figure 97: Preventing Potential Routing Loops in the Network

neighbor site-of-origin
Copyright © 2010, Juniper Networks, Inc.
host1:pe1(config)#router bgp 200
host1:pe1(config-router)#address-family ipv4 unicast vrf yourvpn
host1:pe1(config-router)#neighbor 10.5.4.22 remote-as 100
host1:pe1(config-router)#neighbor 10.5.4.22 as-override
host1:pe1(config-router)#neighbor 10.5.4.22 site-of-origin 200:21
...
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
Chapter 6: Configuring BGP-MPLS Applications
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