Consider an OSPF route advertised over the PE-CE link.
I know this Extended Community is attached to the OSPF route to indicate that it was an OSPF route before being redistributed, but how is this extended community actually created?
I thought BGP extended communities had to be manually configured? Does MP-BGP automatically insert this??
Secondly, lets say the PE-CE routing protocol is RIP - how is this communicated to the remote PE over BGP?
Thanks for helping me get my head round this.