Sham-links

A sham-link overcomes the OSPF default behavior for selecting an intra-area backdoor route between VPN sites instead of an interarea (PE-to-PE) route. A sham-link ensures that OSPF client sites that share a backdoor link can communicate over the MPLS VPN backbone and participate in VPN services.

https://networkinferno.net/ccie-study-ospf-sham-link
https://learningnetwork.cisco.com/thread/99694

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