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OSPF Sham-Link Support for MPLS VPN

Feature History

Release

12.2(8)T

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

backbone.

Modification

This feature was introduced.

shows an example of how VPN client sites that run OSPF can connect over an MPLS VPN

Cisco IOS Release 12.2(8)T