From: Jason Wydra (jasonwydra@xxxxxxxxx)
Date: Mon Mar 18 2002 - 19:25:26 GMT-3
Could someone tell me the difference between a UNI and NNI in Frame Relay. I un
derstand that UNI is used between the CPE and the provider switch and that NNI
is used between two different provider switches. My question is, what is actual
ly different in the frame packet or what signaling techniques are used to diffe
r the two? I understand that adding ANSI annex D allows both devices at either
end to both initiate and respond to status messages/keepalives simultaneously.
So why not just run UNI with Annex D everywhere and forget about having NNI alt
ogether. Do we need to put a label on frame connections so that we know which o
ne is a link between a CPE and switch and which one is a link between two switc
hes? Am I way off base????
Furthermore - The only difference I see between an ATM UNI and NNI is the GFC f
ield and and extended VPI field. Big deal? Why have two separate specifications
?
Thanks,
Jason (NP,DP)
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