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Re: ABOUT: PPP&QOS

2001-10-05 17:40:03

    the RFC2125: The PPP Bandwidth Allocation Protocol (BAP) / The PPP 
Bandwidth Allocation Control Protocol (BACP)  describes some methods to dynamic 
Bandwidth Allocation in Multilink PPP. But it only can add, remote a link 
dynamic, why not go further for the ppp it self to allocate Bandwidth 
dynamically in the use of just only one link, i mean negotiating how much 
bandwidth peer need and without any interrupt. 

    for example, in the pppoe scenario, if we have to implement QOS between the 
BAS and pppoe client( note: no just bandwidth control or limit), what to do?  
extending the ppp or extending the pppoe? which it the best? for the ppp is so 
pop in the network access field, why not just extending the ppp it self?

    i mean, extending the ppp, let the ppp(lcp or ncp for more accurate) can be 
use as a signal protocol, just like rsvp, so all other protocols such as pppoe, 
l2tp can benefit from it.

    "PPP delivers the packet to IP, possibly with a QoS "label", and IP uses 
the QoS to decide how to queue and schedule the packet" 

    yes, i can not  agree u more. but it is the data panel not the control 
panel, how a ppp end point know how much bandwidth the other ppp end point 
needs? traditionally, it can be predefined by administrator. why not do this 
just more automatically, so the peer can dynamically change QOS at any time?

    thanks.



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