The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] E-LSP or L-LSP
______________________________________________ With best regards, Sasha Vainshtein mailto: sasha@iprad.co.il phone: +972-3-7659993 (office) fax: +972-3-6487779 (office) >>-----Original Message----- >>From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of >>Daniel N. Bauer >>Sent: Monday, November 27, 2000 10:49 AM >>To: brunner@ccrle.nec.de; Shahram Davari >>Cc: Simeone Mastropietro; mpls@UU.NET >>Subject: Re: E-LSP or L-LSP >> >> >>Shahram, Marcus, >> >>What about the following thought: >> >>For an E-LSP, the aggregate bandwidth is known. This aggregate bandwidth >>corresponds to the sum of bandwidths that are requested for each PHB class >>that are carried inside the E-LSP. In case that the distribution of the >>PHB classes is known, then admission control could be carried out. >>In networks where resources are pre-allocated per PHB class >>and where this is done consistently on all LSR, then the distribution >>of the pre-allocated resources can be used to carry out admission control >>per E-LSP. >> >>For example, consider the following distribution: >>EF gets 5%, AF1.x gets 10%, AF2.x gets 20%, AF3.x gets 20%, AF4.x >>gets 20%; >>meaning that on a 100Mbit/s link, EF could reserve up to 5 >>Mbit/s, AF1.x up >>to 10Mbit/s, etc. etc. >> >>If now an E-LSP requests 7 Mbit/s and this E-LSP carries EF, >>AF1.x and AF3.x >>traffic, then the 7 Mbit/s could be split up and assigned to the classes >>as follows: >>EF - 1 Mbit/s >>AF1.x - 2 Mbit/s >>AF3.x - 4 Mbit/s >>according to the 'weights' of the resource distribution. >>Then, admission control for each class could be done seperately. The E-LSP >>could be admitted if all of the admission control checks succeed. >> >>Does this sound reasonable? Sorry, to me it does not - please consider the case when you do not need any more LSPs carrying EF traffic in this LSR. >> >>Of course, the whole scheme does not work if the pre-allocated >>resource distribution >>is not consistent amont all LSR routers. >> >>Best regards, >> >>-Daniel >> >> >> >>Marcus Brunner wrote: >>> >>> Shahram, >>> >>> In many scenarios, the admission control for a PBH scheduling classes is >>> already fuzzy, which means on a statistical level, you will run into >>> trouble if you want to do admission control for aggregates of different >>> PHB classes. >>> >>> Marcus >>> >>> Shahram Davari wrote: >>> > >>> > Hi Daniel, >>> > >>> > You can do admission control for E-LSP too. But the admission >>control is done for the aggregate of all supported PHBs in that LSP. >>> > >>> > Regards, >>> > -Shahram >>
|
|