OSPF Sham-Link Support for MPLS VPN
Supported Platforms
8
Cisco IOS Release 12.2(8)T
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
