You are correct that "match tag" will not work for routes learnt in the VRF via BGP process and being sent into the MP-iBGP cloud.
Route-Tag works for below cases:
1. Static Routes
2. Any Routes being redistributed into OSPF Process
3. Static Routes being redistributed into EIGRP Process
(In general route-tag does not works for ISIS also same as BGP)
So now if the config posted by you is applied then only the above mentioned routes can be exported to MP-iBGP. If PE-CE was BGP then definitely no route will be exported and only local static routes matching tag 80 will be exported.
However we can send both BGP as well local static routes based on "TAG" value by including one more permit statement under route-map which will permit all the remaining routes(BGP,Connected) which do not match TAG 80..
The export-map under VRF looks for all the routes present in the VRF and does a match on them based on the criteria provided. So the routes under VRF will be connected,static ( if any) and the PE-CE routing protocol used.
Hope this helps to provide some insight in your query.
Yes you are correct for the export of routes under the VRF with respect to the export-map and "route-target export".I overlooked the export behaviour with being same as import.
In my understanding the export-map will match for the routes present in the Local VRF Routing Table against the match conditions provided.If we need to match based on TAG then there should be a local static route or an OSPF External ROute or an EIGRP External Route with the corresponding tag .Static Route when redistributed under BGP looses the TAG value and thats why its not seen under the "show ip bgp vpnv4 vrf" output.
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