Cisco Systems 1600R manual Supported Platforms, Restrictions, Related Features and Technologies

OSPF Sham-Link Support for MPLS VPN

Supported Platforms

Restrictions

When OSPF is used as a protocol between PE and CE routers, the OSPF metric is preserved when routes are advertised over the VPN backbone. The metric is used on the remote PE routers to select the correct route. For this reason, you should not modify the metric value when OSPF is redistributed to BGP, and when BGP is redistributed to OSPF. If you modify the metric value, routing loops may occur.

Related Features and Technologies

•MPLS

•OSPF

•BGP

Related Documents

•Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2

•Cisco IOS Configuration Fundamentals Command Reference, Release 12.2

•Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2 http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprrp_r/1rfospf.htm

•MPLS Virtual Private Networks http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t5/vpn.htm

•Configuring OSPF

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfospf. htm

•Configuring BGP

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfbgp.h tm

•RFC 1163, A Border Gateway Protocol

•RFC 1164, Application of the Border Gateway Protocol in the Internet

•RFC 2283, Multiprotocol Extensions for BGP-4

•RFC 2328, Open Shortest Path First, Version 2

•RFC 2547, BGP/MPLS VPNs

Supported Platforms

•Cisco 1400 series

•Cisco 1600

•Cisco 1600R

•Cisco 1710

•Cisco 1720

Cisco IOS Release 12.2(8)T

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