[nsp] Real world L2TP PXF performance increases

[Robert Kiessling]

Mark Ivens <mivens@clara.net> writes:

> Thus spake Arie Vayner (ariev@netvision.net.il):
> 
> > Also, you must be very careful with features on PXF - if you get it
> > wrong, you will shut off the PXF processing.
> > I know about problems with MSS Adjust on several platforms/versions.
> 
> Would you mind saying which platforms/versions?
> 
> For 12.2(4)B4 the only relevant defect I can see on CCO is CSCdw93170
> "PXF still punts packets after removal of ip tcp adjust-mss" which I'm
> not too bothered by since I'll be leaving tcp adjust-mss on.

Enabling MPLS on the GE disables PXF switching even for those packets
which are not MPLS-switched.

An issue with 12.2(4)B4 is that it didn't free vaccess interfaces,
which why we had to revert to 12.2(2)DD4.

Robert