Taming piggish flows via QoS

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Jun 29th, 2007
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We have 10Mbit Metro Ethernet TLS between sites that use 100Mbit internally. Of the various QoS types available in Cisco midrange routers & 2960/3550 switches, can any enforce that no single flow use more than, say, 7 Mbits? And can that rule adjust after business hours so backups get 100%

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pnicolette Mon, 07/02/2007 - 11:38
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Thank you for the quick response and link to timed ACL info.

If I understand the example, policing per class will restrict total bandwidth available to an ACL-defined group or "class" of flows. Can Cisco QoS create a per-flow restriction which applies to ANY SINGLE flow?

This is different from limiting a predefined flow or list of flows, and also different from limiting the summed bandwidth of multiple flows. It's more like creating an individual class for every new flow and imposing a standard constraint. If Cisco QoS cannot do this yet, might it be considered in future?

andrew.burns Wed, 07/04/2007 - 00:34
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The feature you need is UBRL (User-Based Rate Limiting) but it's only available on the Sup720 - you probably won't ever see it on the low end switches because it's PFC3 based but you never know.




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