[nsp] Guaranteeing minimum bandwidth on shared access and capping the max

[Eduard Metz]

There are several ways to approach this (in theory ;-)).

One thing you could have a look at is MQC (modular QoS CLI), it has some
features to built hierarchical policies. That could be helpful in this case.

The outbound traffic you can limit on the outgoing interface through e.g.
shaping the traffic to 3 Mbps, and within that use CBWFQ to assign a minimum
share of 512 to each usergroup.

For inbound traffic you could either try to limit the traffic on the
incoming interface by policing. Per class you mark the volume up to 512 kbps
as conforming, then on the aggregate policer you make sure not to drop to
the 'conforming' traffic (but still count it) and police the aggregate at 3
Mbps. Alternative you could try to implement a shaping+scheduling policy on
the outgoing interface (VLAN), or even better outgoing at the other side of
the FE link.

I'm not completely sure about the feasibility of the inbound part, but hope
this helps anyway.

cheers,
	Eduard


> -----Original Message-----
> From: cisco-nsp-admin@puck.nether.net
> [mailto:cisco-nsp-admin@puck.nether.net]On Behalf Of Stephen J. Wilcox
> Sent: donderdag 14 november 2002 22:33
> To: Jay Nakamura
> Cc: cisco-nsp@puck.nether.net
> Subject: Re: [nsp] Guaranteeing minimum bandwidth on shared access and
> capping the max
>
>
> well custom queuing will allow you to match ip addresses and
> ensure each group
> has a fair share of the available bandwidth so that will do
> your 512k and no
> hogging.. you wont have a maximum aggregate (the 3mb limit)
> tho but you could
> just run standard rate limiting to do that, not sure of how
> the two mechanisms
> will interact but i dont see a problem - try it
>
> Steve
>
> On Thu, 14 Nov 2002, Jay Nakamura wrote:
>
> >
> > Hello all,
> >
> > The subject may be confusing because what I am trying to do
> is a little
> > confusing.
> >
> > I had to believe that there is some way to do what I want
> to do with just
> > Cisco router, so I thought I will see if anyone had any
> brilliant ideas.
> >
> > - What I want to do
> >
> > Let's say there are 3 users groups.  They are all connected
> to a switch on
> > different VLANs.  All VLANs go to a Cisco router on FastEth
> port with
> > trunking.  Out the cisco router is also connection to the
> outside world,
> > let's say this is on FastEth port as well.
> >
> > What we want to do is, between the 3 user groups, limit the
> usage (to the
> > outside world) to 3mbps, while guaranteeing each have
> certain amount of
> > minimum bandwidth so one user group doesn't hog all the
> bandwidth.  Let's
> > say 512kbps each.
> >
> > Does that explain well enough what I am wanting to do?  Any
> ideas on how to
> > implement this?
> >
> > If the outgoing interface is a T1, and the max is the T1
> bandwidth, I have
> > figured out a way to do this really nicely with priority
> queuing and CAR but
> > this one has stumped me.
> >
> > Thanks,
> >
> > - Jay
> >
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