Cisco Systems 1600R, 1400 series manual Feature Overview, Using Ospf in PE-CE Router Connections

OSPF Sham-Link Support for MPLS VPN

Feature History

ReleaseModification

This document describes how to configure and use a sham-link to connect Virtual Private Network (VPN) client sites that run the Open Shortest Path First (OSPF) protocol and share backdoor OSPF links in a Multiprotocol Label Switching (MPLS) VPN configuration.

This document includes the following sections:

•Feature Overview, page 1

•Supported Platforms, page 8

•Supported Standards, MIBs, and RFCs, page 10

•Prerequisites, page 10

•Configuration Tasks, page 10

•Configuration Examples, page 12

•Command Reference, page 12

•Glossary, page 16

Feature Overview

Using OSPF in PE-CE Router Connections

In an MPLS VPN configuration, the OSPF protocol is one way you can connect customer edge (CE) routers to service provider edge (PE) routers in the VPN backbone. OSPF is often used by customers that run OSPF as their intrasite routing protocol, subscribe to a VPN service, and want to exchange routing information between their sites using OSPF (during migration or on a permanent basis) over an MPLS VPN backbone.

Figure 1 shows an example of how VPN client sites that run OSPF can connect over an MPLS VPN backbone.

Cisco IOS Release 12.2(8)T

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