yes as a result of service provider efforts to emulate an OSPF domain on behalf of the customer
from a configuration point of view the PE node has to redistribute OSPF into BGP address-family ipv4 vrf name, then via vpvn4 address-family the vpnv4 prefix with the extended communities that carry the OSPF data are sent.
The remote PE on accepting the vpnv4 route and importing it in the VRF routing table recognizes that the OSPF domain-id matches and creates an OSPF LSA that represent the route.
The OSPF LSA is then sent to the remote CE that can treat this as an O IA route
RIP is not able to detect different route types so the PE needs to perform redistribution of RIP into BGP address family ipv4 vrf name.
There is no need to carry additional information, remote PE will redistribute into RIP for the remote CE and this is all.
A seed metric is needed for successful redistribution into RIP.
So, Extended BGP communities in MP-BGP is different from regular BGP Extended communities from a configuration perspective - ie regular BGP Extended communities is entered through the command line and Extended BGP communities in MP-BGP is an automatic attribute (similar to regular BGP communities attribute?)
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