[c-nsp] QoS on Multilink T1's.

[Joseph Mays]

> We has similar issues and had to make a change to the ML interface. Try adding ppp multilink fradment disable. 

I need to do some more testing, but it looks at first observation as if this may have fixed the problem. Why would fragmenting packets on a multilink PPP interface be a problem for QoS, and what are the potential implications of not fragmenting packets on the interface?