QoS/CoS in the real world?
Art Houle
houle at zeppo.acns.fsu.edu
Mon Jul 15 13:58:32 UTC 2002
On Mon, 15 Jul 2002, Peter John Hill wrote:
> --On Sunday, July 14, 2002 9:26 PM -0400 Art Houle
> <houle at zeppo.acns.fsu.edu> wrote:
> > On Sun, 14 Jul 2002, Marshall Eubanks wrote:
>
> >> On Sun, 14 Jul 2002 21:13:13 -0400 (EDT)
> >> Art Houle <houle at zeppo.acns.fsu.edu> wrote:
> >> Or, to put it another way, how are the packets marked ? And why not just
> >> drop them then and there, instead of later ?
>
> > If we are not using our WAN connections to capacity, then p2p traffic can
> > expand and fill the pipe, but if business packets are filling the pipes,
> > then the p2p stuff is throttled back. This makes 100% use of an expensive
> > resource.
>
> So, you are doing straight tcp port filtering. Are there any clients that
> use dynamic ports? Things will get trickier for you. Other than Packetteer,
> are there any other products that can look into the data of a packet at any
> usable rate to do filtering/marking?
>
We look at ports mostly to mark the packets, but we are also using cisco
'pdlm' to discover the p2p stuff. We are not doing port filtering to drop
packets, WFQ is doing the drop function.
policy-map cbwfq2ISPonPVC
class class-default
random-detect dscp-based
random-detect dscp 0 5 10 8
random-detect dscp 8 15 22 16
random-detect dscp 16 20 30 32
random-detect dscp 24 30 45 64
random-detect dscp 48 40 60 128
random-detect dscp 56 50 75 256
fair-queue
fair-queue queue-limit 24
queue-limit 72
vc-class atm Sprint-ISP
ubr 45000
encapsulation aal5snap
interface ATM0/0/0.1 point-to-point
pvc 0/106
class-vc Sprint-ISP
service-policy out cbwfq2ISPonPVC
>sho policy-map interface
Class Random Tail Minimum Maximum Mark Output
drop drop threshold threshold probability packets
0 6960177 19227320 5 10 1/8 962935241
8 245 16 15 22 1/16 47165439
16 0 0 20 30 1/32 2754705
24 0 0 30 45 1/64 18453509
48 0 0 40 60 1/128 62112
56 0 0 50 75 1/256 119861
fair-queue: per-flow queue limit 24
queue-limit 72
Art Houle e-mail: houle at acns.fsu.edu.
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