BGP community

I currently have a fortigate connected to a ISP via a 1g and 10 g link.
I have asymmetric routing, so I shut down the 1G. however this is a back up.
I need to put an inbound route filter on the routes learned from the ISP to stop routes we announce to then on one link from being learned back on the other . I am thinking of tagging the routes with a BGP extended community so that they can be easily recognized on the way back in without maintaining an explicit prefix list.

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