Hi I was going through sham-link RFC & i found some thing intresting & but confusing. I had simulated the LAB for sham link & checked that we won't require redistribution between MPBGP & OSPF when we are using sham-link just we need to configure ospf with vrf & shamlink . Becasue sham-link treat itself as a point to point link with unnumbered interface. 18.104.22.168. Routing and Forwarding on Sham Links If a PE determines that the next hop interface for a particular route is a sham link, then the PE SHOULD NOT redistribute that route into BGP as a VPN-IPv4 route. Any other route advertised in an LSA that is transmitted over a sham link MUST also be redistributed (by the PE flooding the LSA over the sham link) into BGP. This means that if the preferred (OSPF) route for a given address prefix has the sham link as its next hop interface, then there will also be a "corresponding BGP route", for that same address prefix, installed in the VRF.
My Question :
Can some one clear me that i configured sham-link then do we require redistibution on OSPF to MPBGP for route propogation ?
If redistrubution is not requried then what is the meaning of below statement.
Any other route advertised in an LSA that is transmitted over a sham link MUST also be redistributed (by the PE flooding the LSA over the sham link) into BGP
Solved! Go to Solution.