From: Kal Han (calikali2006@gmail.com)
Date: Mon Dec 04 2006 - 15:12:09 ART
very well explained.
Thank you Petr.
Kal
On 12/2/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
>
> With VPN3k we have three kinds of QoS policies:
>
> 1) Default Interface Policy (Applies dynamically by default)
> 2) Group-Specific Policy (Applies dynamically to Group members)
> 3) Aggregate Group Bandwidth (Static Reservation for a Group)
>
> QoS Policy has two aspects: bandwidth reservation (min guaranteed) and
> policing (max allowed). In addition to guaranteed bandwidth, bandwidth
> reservation defines a simple admission policy: as long as there is spare
> bandwidth on interface, greater than the requested value, a user is
> allowed to
> connect.
>
> Now Bandwidth Aggregation concept is utilized to simple reserve *in
> adavnce* a
> hunk of available bandwidth to a particular group (e.g.
> "really_important_users").
> That is, this bandwith is "chomped off" the available bandwidth for the
> interface,
> and is shared among the particular group users *only*, when they connect.
> This
> kind of policy guarantees the important users their share of interface
> bandwidth,
> under heavy load; however it takes this bandwidth off the 'available
> interface pool'
> for other users.
>
> Bandwidth Aggreagation is also useful for L2L tunnels, since it permits
> them to
> be connected at any time, regardless of interface load.
>
> When you set Bandwidth Aggregation value to 0, you imply that group does
> not receive any bandwidth in advance, and therefore shares the interface
> bandwidth
> with the other users. If not enouth bandwidth is available, some
> "important users"
> may not be able to connect.
>
> HTH
>
> 2006/12/3, Kal Han <calikali2006@gmail.com>:
> >
> > Hi
> > what is the purpose of this "bandwidth aggregation" when assigning
> > a bandwidth policy to a group ?
> >
> > We already define the minimum bw requirement in the policy.
> > What is this additional thing ?
> >
> > also what does it mean by
> > "If you want the group to share in the available bandwidth on the
> > interface,
> > enter 0"
> >
> > If I leave it at 0, will my policy take care of the bw reservations ?
> > Its confusing :)
> >
> > This is what the DOC says.
> >
> > Bandwidth Aggregation
> >
> > Enter a value for the minimum bandwidth to reserve for this group and
> > select
> > a unit of measurement:
> >
> > bpsbits per second
> >
> > kbpsone thousand bits per second
> >
> > Mbpsone million bits per second
> >
> > The default value of Bandwidth Aggregation is 0. The default unit of
> > measurement is bps. If you want the group to share in the available
> > bandwidth on the interface, enter 0.
> >
> > Thanks
> > Kal
> >
> > _______________________________________________________________________
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>
>
>
> --
> Petr Lapukhov, CCIE #16379
> petr@internetworkexpert.com
>
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