VPRN Features
Page 704 7210 SAS-X OS Services Guide
• Advertisement/redistribution of BGP-VPN routes as summary (type 3) LSAs flooded to
CE neighbors of the VPRN OSPF instance. This occurs if the OSPF route type (in the
OSPF route type BGP extended community attribute carried with the VPN route) is not
external (or NSSA) and the locally configured domain-id matches the domain-id carried in
the OSPF domain ID BGP extended community attribute carried with the VPN route.
• OSPF sham links. A sham link is a logical PE-to-PE unnumbered point-to-point interface
that essentially rides over the PE-to-PE transport tunnel. A sham link can be associated
with any area and can therefore appear as an intra-area link to CE routers attached to
different PEs in the VPN.
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