Hi all,

The ACL model is converging on a small core set of functionality that is fairly 
common.

But I think the matching on input-interface should be removed from the model 
(or at the least put inside a feature flag).

Matching on basic IPv4/IPv4/MAC header fields is common functionality.  But 
having that input-interface match on metadata in the core model is out of 
place.  It should be left to further extension drafts or vendor specific 
augmentations (along with whatever other metadata might be useful or 
vendor-specific).

ACLs are typically assigned to interfaces as shown in section A.3. of the ACL 
draft.   That is the most common use case.

Actually matching on input-interface in the ACL rules themselves is not basic 
core ACL functionality.  Nokia SR OS does not have that capability.  Does 
IOS-XR ?  Brocade ?  others ?     If some major implementations don't do it, 
and it isn't necessary for typical basic ACL use, then it should be removed (or 
feature flagged).

Regards,
Jason

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