[c-nsp] "Packets dropped to the next slow path"

[Vincent De Keyzer]

Right Rodney, that's exactly what we are doing (and BTW, how to configure
this was explained to me two years ago on this excellent list).

So basically, my problem is that CEF does not support PPP half-bridging, so
if I want to offer VoIP to this customer, I have two options:
1. move him to a router where CPU usage is not subject to peaks (which is
what I did temporarily)
2. install an E1 router (instead of a bridge) at customer premises, and do
plain PPP

Please confirm my understanding...

Vincent

PS: "sh int stat" indeed shows that traffic is switched by the processor
mostly (why not completely? Seems like 0.2% of the packets do find their way
via CEF, weird!)


> I'd never seen that either until last week when someone complained
> that their counters were not working for MQC policing.
> 
> ppp bridge ip is like a BVI under the covers to bridge
> ethernet frames out over the PPP link from what I see.
> 
> 
> 
> se2/0
> ip add 1.1.1.1  --- pppp link ---- remote router --- ethernet
> 
> and the remote router is like a transparent bridge between
> the ip of 1.1.1.1 to the remote 1.1.1.0/24 subnet.
> 
> I have no idea if we support that in anything other than process
> level code. I've never tested it.
> 
> Rodney
> 
> >
> > I've never seen anyone assign a MAC address to a serial interface.
> What's
> > the purpose of that, the secondary addresses, and "ppp bridge ip"?
> >
> > I kind of wonder if the fact that you seem to be enabling bridging on
> the
> > interface is why the traffic isn't cef switched...though have you
> verified
> > it's really not by doing a show int stats?  That'll probably show
> most/all
> > the traffic is process switched.
> >
> >
> > ----------------------------------------------------------------------
> >   Jon Lewis                   |  I route
> >   Senior Network Engineer     |  therefore you are
> >   Atlantic Net                |
> > _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
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