I have a trunk from an ASR 920 to an ASR 1002 HX which I am using for a border router. I can configure it either with subinterfaces or service instances and bdis. I dont really see any practical differences other than I can save vlans on the router by using service instances and stripping the tags. I dont really foresee that being an issue but if there is no reason I shouldnt use a bdi then I think I should be consistent with the ASR 920s.
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