VPRN Features
Page 1082 7750 SR OS Services Guide
IP-VPNs
Using OSPF in IP-VPNs
Using OSPF as a CE to PE routing protocol allows OSPF that is currently running as the IGP
routing protocol to migrate to an IP-VPN backbone without changing the IGP routing protocol,
introducing BGP as the CE-PE or relying on static routes for the distribution of routes into the
service providers IP-VPN. The following features are supported:
• Transportation of OSPF learned routes as OSPF externals. This feature uses OSPF as the
protocol between the PE and CE routers, however instead of transporting the OSPF LSA
information across the IP-VPN, the OSPF routes are “imported” into MP-BGP as AS
externals. As a result, other OSPF attached VPRN sites on remote PEs receive these via
type 5 LSA.
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