1- For site C to learn N1, PE connected to site A and B needs to export N1 using route-target BGP extended community. PE connected to site C needs to import those routes. To be sure PE-C receives both routes, PE-A and PE-B should have a unique RD configured (in case there is a RR) and should both prefers their eBGP route.
2- It depends if you have the same BGP AS on site A and B and if the PEs are configured with the as-override feature. So we have the following scenarios:
- Different BGP AS: prefix accepted
- Same BGP AS with as-override: prefix accepted
- Same BGP AS without as-override: Prefix rejected.
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
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