From: Earl Aboytes (earl@xxxxxxxxxxxx)
Date: Mon Sep 11 2000 - 17:55:38 GMT-3
UBR is a best effort service class that holds no guarantees. It has the lowest
priority of all the services.
ABR is a low priority service but not as low as ubr. It allows for the specifi
cation for a minimum cell rate (mcr) which is not provided for in ubr. UBR+ do
es allow for an MCR so the only difference becomes the priority.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Earl Aboytes CCIE #6097
Senior Technical Consultant
Verizon Managed Solutions
805-381-8817
earl.aboytes@verizon.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
---------- Original Message ----------------------------------
From: "Scott F. Robohn" <sfr@mentortech.com>
Reply-To: "Scott F. Robohn" <sfr@mentortech.com>
Date: Mon, 11 Sep 2000 16:22:28 -0400
>Not quite sure about this, but I think UBR+ was a Cisco
>marketing-type phrase for an ABR-like traffic management
>category before ABR actually existed.
>
>FWIW,
>sfr
>
>> shotcaller30 wrote:
>>
>> I'm having trouble figuring out the difference between abr
>> and ubr+.
>>
>> The docs show this for ABR
>> In ABR transmission, the peak cell rate (PCR) specifies
>> the maximum value of the allowed cell rate (ACR), and
>> minimum cell rate (MCR) specifies the minimum
>> value for the ACR. ACR varies between the MCR and the PCR
>> and is dynamically controlled using congestion control
>> mechanisms.
>>
>> and this for ubr+
>> To select Unspecified Bit Rate (UBR) QOS and configure the
>> output peak cell rate and output minimum guaranteed cell
>> rate for an ATM PVC, SVC, or VC class,
>> use the ubr+ command in the appropriate command mode.
>
>--
>>> Scott F. Robohn, CCSI #20826/CCNP/CCDP ........ 703-623-3752 <<
>>> mentor technologies ..... Service Provider Engineering Group <<
>>> mailto:sfr@mentortech.com ........ http://www.mentortech.com <<
>>> ........... Formerly Chesapeake Network Solutions .......... <<
>
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