[j-nsp] Class of Service implementation over MLPPP link
FAHAD ALI KHAN
fahad.alikhan at gmail.com
Wed Apr 18 01:47:11 EDT 2007
> Dear Josef
> Thanks for your valuable information, and yes you got right....i was
> checking on interface extensive, which not showing any Q stats...while on
> *sh interface queue, *the packets are actually going to those specific
> Kindly can you explain this is little bit detail...as i cant get it
> " On the egress interface we have to put all into Q0 since you
> are not using multiclass mlppp and we have only one SEQ pool
> so we will end up all in one queue to prevent re-order. The queuing is
> done in LSQ prior to putting on the seq stamps."
> What is the significance of MultiClass MLPPP, cant i get the
> Gold/Silver/BE/NC traffic with out configuring this parameter?
> Also while checking on consituent link stats (sh interface extensive or sh
> interface queue) both shows the packets are going through BE queue, where as
> at lsq level they are flowing through Gold or Silver.
> Can you provide this information.
> On 4/18/07, Josef Buchsteiner <josefb at juniper.net> wrote:
> > Fahad,
> > the behavior you see is normal and expected.
> > First to see the queue statistic on LSQ interface you most
> > likely forgot to add the subunit number as the interface
> > queue number will be zero all the time since this is the
> > entire LSQ interfaces. That's the reason why you configure
> > per-unit-scheduler on the LSQ interface.
> > On the egress interface we have to put all into Q0 since you
> > are not using multiclass mlppp and we have only one SEQ pool
> > so we will end up all in one queue to prevent re-order. The
> > queuing is done in LSQ prior to putting on the seq stamps.
> > We do recommend once there is LFI traffic to configure
> > scheduler on the egress PIC to make sure it gets the right
> > priority and served prior to the ML packets and the
> > interleaving is done there. So with LFI traffic and the
> > fragmentation-map it would then go into a different egress PIC
> > queue. If you use ML-MLPPP you will then see all going in
> > different egress queues.
> > However the point is that queuing is done on LSQ. So your
> > configuration is ok and most likely all is working correctly.
> > Just check if you get the LSQ queue number
> > <-- example like this, please check on your side
> > josefb at minsk# run show interfaces queue lsq-1/2/0.0
> > Logical interface lsq-1/2/0.0 (Index 76) (SNMP ifIndex 65)
> > Forwarding classes: 4 supported, 4 in use
> > Egress queues: 4 supported, 4 in use
> > Burst size: 0
> > Queue: 0, Forwarding classes: best-effort
> > Queued:
> > Packets : 113479 166
> > pps
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