[c-nsp] Cisco MultiLink PPP

[Richard J. Sears]

Hi Rodney,

Would 7513's running 12.2(27) have problems with MLPPP...? We had to
convert all of our MLPPP customers to ip load sharing per packet because
we would lose the mlppp links and the only way to get them back was to
reboot the router. I would like to use MLPPP, but I (like many) have had
horrible headaches with it.

We are running around 300 T1s per 7513 with RSP4s.

Thanks

On Thu, 24 Mar 2005 09:24:39 -0500
Rodney Dunn <rodunn at cisco.com> wrote:

> I've worked through a lot of those bugs on the 75xx
> and we did have some bad ones.
> 
> All the ones I know of have been fixed in later 12.0S 
> code and latest 12.2 and 12.3 mainline
> code.
> 
> You were most likely hitting:
> 
> CSCed29590
> Multilink PPP link flap causes output frozen for member link
> 
> which was the worst one.
> 
> I've seen lots of large customers running dMLP on
> a 75xx running stable for over a year.
> 
> My recommendation would be 12.0(27)S4 or 12.3(13).
> 
> What I find is most people don't have the box setup
> properly to be running in fully distributed mode so the
> bundles are distributed and/or their VIPs don't have the
> CPU power to handle the bundles.
> 
> 
> Rodney
> 
> 
> CSCeg28064
> Internally found moderate defect: Assigned (R)
> cbus complex results in incorrect multilink state
> 
> CSCeb31029
> Internally found moderate defect: Resolved (R)
> Output rates incorrect on dMLP/dMFR/dLFI interfaces under congestion
> 
> CSCee69493
> Externally found moderate defect: Resolved (R)
> dMLP fails if control is given to IOS MLPPP
> 
> CSCin36465 Watchdog crashed because of MLPPP
> 
> CSCin47712 txacc loss after OIR
> 
> CSCec00268 Input drops and * throttles on PPP multilink interface
> 
> CSCea59948 Output stuck on a T3 Port Adaptor
> 
> CSCec87815
> Multilink buffer header leak on a VIP with an ATM PA installed
> 
> CSCed29590
> Multilink PPP link flap causes output frozen for member link
> 
> CSCin55432
> Internally found moderate defect: Resolved (R)
> Spurious memory access at vipmlp_change_primary
> 
> 
> On Thu, Mar 24, 2005 at 06:01:48AM -0800, David Barak wrote:
> > 
> > --- Lawrence Wong <lawrencewong72 at yahoo.com> wrote:
> > <questions regarding MLPPP>
> > 
> > Cisco MLPPP mostly works, but there are a couple of
> > really bad gotchas.  My experience with it is watching
> > it NOT work on 75xx series routers.  More accurately,
> > it would work, but when a T1 would bounce and recover,
> > a show command would cause the router to reload.  That
> > was not resolved as of last October (when I left the
> > company which had the case open).
> > 
> > My overall impression is that MLPPP is relatively
> > flaky.  I could recommend MLFR for point-to-point
> > circuits, but that can be kind of flaky too (lots of
> > problems in initial code releases), although I've now
> > got some customers using this, and it's working most
> > of the time.
> > 
> > Do you own both ends of the circuit?
> > 
> > -David Barak
> > need Geek Rock?  Try The Franchise!
> > http://www.listentothefranchise.com
> > 
> > 
> > 		
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******************************************
Richard J. Sears
Vice President         
American Internet Services                          
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