HDLC frames delivered over PWs

Javi <[email protected]>
Newsgroups gmane.ietf.l2tpext
Message-ID <[email protected]>
One question related to transport of HDLC (or LAPB) frames over L2TPv3 
(+PWE3):

What HDLC frames are delivered over PWs?, only frames I (Information), 
also RR and RNR, or all frames. It is a very important efficiency 
factor. For instance, RR frames are continuously send, it would consume 
too bandwidth in IP network.

Javi Muñoz
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