[c-nsp] Cisco MultiLink PPP

[Dennis Peng]

Ted Mittelstaedt [tedm at toybox.placo.com] wrote:
> cisco-nsp-bounces at puck.nether.net wrote:
> >> I just converted one of our remote POPs from an NxT1 cef load sharing
> >> to MLPPP to see if it would help with some VOIP quality issues we
> >> were having.  Am I right in thinking that MLPPP avoids the sort of
> >> out of order packet arrival that per-packet cef load sharing can
> >> cause?...while still doing nearly perfect load sharing across a
> >> number of T1s?
> >
> > Yes, both true..
> >
> 
> FALSE!
> 
> It does great load sharing but you can still have packets arriving out
> of order.

Can you explain how this occurs? Packets should never be sent
out-of-order through a multilink bundle.

Could you also point me to your case number? Thanks.

Dennis
 
> I just closed a case with TAC on this last week.  It was one of those
> cases pushed up from bonehead support to higher level support.  The
> problem is CBAC ACL's didn't work on routers running load balancing
> on either ip cef or multilink ppp.  (well they worked if I only wanted
> to have about 30kbps throughput on a 3MBps link, that is)
> 
> The tech the case eventually arrived at said in no uncertain terms that
> this was a known bug - CBAC can't handle out of order packets, and you
> get
> them in either load balancing scenario.
> 
> He said the fix is in the most current 12.3, and that there have been
> "literally thousands" of bugs corrected in load balancing scenarios in
> the last year.  (his words)
> 
> Ted
> 
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