[c-nsp] QoS Design Question

[Patrick Greene]

You are correct..the topology is 

hub -- PE -- (mpls) -- PE -- spoke

If I set a policy on the hub router to guarantee 10Mbps for LOB applications
outbound towards the MPLS cloud and if I am telling my spoke router to
guarantee 512Kbps for LOB application outbound towards the MPLS cloud then
outbound I am all set.  However, for inbound LOB traffic on the spoke router
the hub (set at 10Mbps) can send more than 512Kbps of LOB traffic and
consume the T1 inbound.  On my spoke router, should I be setting my
bandwidth guarantees inbound from the MPLS instead out towards the MPLS?

Basically I want to gurantee 512Kbps of traffic for LOB apps in and out of
each spoke.  I don't have subinterfaces at the hub for each site to apply
policies to so I am stuck with an aggregate policy...or so it seems.

Am I making sense here?


Thanks for your input.


-----Original Message-----
From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com] 
Sent: Thursday, October 18, 2007 3:02 AM
To: Patrick Greene; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] QoS Design Question

Patrick Greene <> wrote on Wednesday, October 17, 2007 11:45 PM:

> Thanks for any contributions here.
> 
> 
> 
> This is hypothetical and not production.  Assume a single company with
> hundreds of remote sites.  With today's MPLS environments you have
> 100's of sites(T1's) coming back into a single physical
> interface(DS3) on the router. I am applying my QoS policies outbound
> on my core router interface to manage my 3 classes of traffic:
> voice,LOB apps, and default.   The voice gets 5Mbps, LOB applications
> get  10Mbps on and default gets the rest.  The remote sites all have
> T1's and I allocate 128Kbps to voice, 512MB to Signaling and LOB
> applications, and default for all other apps.  This too is applied
> outbound on the serial interface.  How do I keep the default
> applications from overrunning the INBOUND LOB applications.   Do I
> need to apply my QoS policy  inbound on the Serial interface instead
> of outbound? Won't that affect VOIP quality if I don't have outbound
> policies.  

not sure if I understand the topology and the problem. Assuming you have

  hub -- PE -- (mpls) -- PE -- spoke

you apply outgoing policies on the hub->PE and on the PE->spoke as well
as on the spoke->PE and PE->hub direction (and obviously within the MPLS
cloud), you will be able to protect voice, won't you? Not sure what you
mean by "overrunning the INBOUND LOB"?

	oli