From: Jason T. Rohm (jtrohm@xxxxxxxxxxx)
Date: Mon Oct 02 2000 - 11:06:53 GMT-3
Does anyone know where I can find documention on Cisco's implementation of
RFC 1990 (MLPPP)? In particular I am interested in the way Cisco has
implemented the fragmentation and dispatch mechanisms.
I have a 1601 w/BRI WIC here. I am trying to determine if adding an analog
dial-up to the MLPPP bundle will increase performance. The reason I am
questioning this is because all of Cisco's documentation says that the
fragements are dispatched in a round-robin fashion.
This would mean that the actual bandwidth available might be (Nx) where x
is the lowest bandwidth the channels (3 x 33.6 = 100.8 kbps). (See RFC
comments below.)
The RFC outlines two methods of breaking up the packet. First, break up the
packet into unequal fragments using the bandwidth of the channel to
determine size. Second, break up the packet into numerous small fragments
and dispatch the fragments proportionately to the bandwidth.
If Cisco uses method one, then a round-robin dispatch would make sense.
However, if this is true, how does the IOS determine the bandwidth of the
analog line? (Since the external modem does not return a connect speed).
Thanks
-Jason
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