Cisco 1600R - Manual
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Table of Contents:
- Page 2 – Using a Sham-Link to Correct OSPF Backdoor Routing
- Page 5 – Sham-Link Configuration Example
- Page 7 – Benefits
- Page 8 – Restrictions; Supported Platforms
- Page 10 – Prerequisites
- Page 11 – Command
- Page 12 – Monitoring and Maintaining a Sham-Link; To monitor a sham-link, use the following show commands in EXEC mode:; Configuration Examples; show ip ospf sham-links
- Page 14 – Examples
- Page 16 – Glossary; OSPF—Open Shortest Path First protocol.
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Cisco IOS Release 12.2(8)T
OSPF Sham-Link Support for MPLS VPN
Feature History
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:
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Supported Standards, MIBs, and RFCs, page 10
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Configuration Examples, page 12
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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.
shows an example of how VPN client sites that run OSPF can connect over an MPLS VPN
backbone.
Release
Modification
12.2(8)T
This feature was introduced.
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Summary
OSPF Sham-Link Support for MPLS VPN Feature Overview 2 Cisco IOS Release 12.2(8)T Figure 1 OSPF Connectivity Between VPN Client Sites and an MPLS VPN Backbone When OSPF is used to connect PE and CE routers, all routing information learned from a VPN site is placedin the VPN routing and forwarding (V...
OSPF Sham-Link Support for MPLS VPN Feature Overview 5 Cisco IOS Release 12.2(8)T Figure 3 Using a Sham-Link Between PE Routers to Connect OSPF Client Sites Because the sham-link is seen as an intra-area link between PE routers, an OSPF adjacency is created anddatabase exchange (for the particular O...
OSPF Sham-Link Support for MPLS VPN Feature Overview 7 Cisco IOS Release 12.2(8)T PE-1# show ip cef vrf ospf 10.3.1.7 10.3.1.7/32, version 73, epoch 0, cached adjacency to POS3/0/0 0 packets, 0 bytes tag information set local tag: VPN-route-head fast tag rewrite with PO3/0/0, point2point, tags impos...
