03-24-2016 06:16 AM - edited 03-08-2019 05:06 AM
Hello,
Im studying QOS Congestion management and cant find the difference between Queuing tools (CQ,PQ, CBFWQ) and scheduling mechanisms - WRR, DRR, MDRR. How schedulling and queuing tools are related ?
1) Do it's possible to enable on interface just queuing tool for example CBFWQ, but without any round robin ? How the traffic with 3 queues would be scheduled then ?
2)Do it's possible to enable just DRR or MDRR but without any queueing (CQ, PQ, CBFWQ) ? How the traffic would be queued then ? Or round Robin is just like an extension to any queueing ?
Thanks in advance!
P.S for example:
Why i would need a separate (DRR, MDRR) scheduler if am using for example PQ. In PQ configurtation i would configure the highest queue've best priority, why i would need a scheduler ?
Solved! Go to Solution.
03-24-2016 07:14 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Generally Cisco has documentation, on their main web site, that would answer all your question. But finding the answers often requires much digging and cross referencing.
BTW, some of your listed queuing methods are generally only found on routers, and some are only found on switches. Some of your listed queuing method, are "old", and some no longer supported on newer IOSs.
1) Do it's possible to enable on interface just queuing tool for example CBFWQ, but without any round robin ? How the traffic with 3 queues would be scheduled then ?
There are multiple ways to configure CBWFQ. Packet selection scheduling would depend on the CBWFQ configuration (and the version of CBWFQ being used). I.e. unless you describe how you define your 3 queues, cannot answer how scheduling would apply.
2)Do it's possible to enable just DRR or MDRR but without any queueing (CQ, PQ, CBFWQ) ? How the traffic would be queued then ? Or round Robin is just like an extension to any queueing ?
Generally platforms that support DRR/MDRR don't support CQ, PQ, etc.
03-24-2016 07:14 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Generally Cisco has documentation, on their main web site, that would answer all your question. But finding the answers often requires much digging and cross referencing.
BTW, some of your listed queuing methods are generally only found on routers, and some are only found on switches. Some of your listed queuing method, are "old", and some no longer supported on newer IOSs.
1) Do it's possible to enable on interface just queuing tool for example CBFWQ, but without any round robin ? How the traffic with 3 queues would be scheduled then ?
There are multiple ways to configure CBWFQ. Packet selection scheduling would depend on the CBWFQ configuration (and the version of CBWFQ being used). I.e. unless you describe how you define your 3 queues, cannot answer how scheduling would apply.
2)Do it's possible to enable just DRR or MDRR but without any queueing (CQ, PQ, CBFWQ) ? How the traffic would be queued then ? Or round Robin is just like an extension to any queueing ?
Generally platforms that support DRR/MDRR don't support CQ, PQ, etc.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide