06-29-2007 08:29 AM - edited 03-03-2019 05:40 PM
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%
06-29-2007 08:38 AM
Yes.
For speed restriction, use per-class policing.
For minimum bandwidth reservation, use "bandwith" command.
e.g. for minimum 1 Mbit and maximum 7Mbit
policy-map test1
class test-class
bandwidth 1024
police 7000000 26000
For backups, use timed ACLs.
http://www.cisco.com/en/US/tech/tk543/tk759/technologies_tech_note09186a00801aa69d.shtml
07-02-2007 11:38 AM
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?
07-04-2007 12:34 AM
Hi,
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.
HTH
Andrew.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: