North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Does peering at an ATM MAE require a router that does ABR?
Yes. They are still there. They are both ABR services. The 'guaranteed' as they call is, has the PCR at 2x MCR. The 'best-effort' is MCR of 100 cps, PCR being somewhere around 1/2 port speed. On Thu, 1 Mar 2001, Steve Feldman wrote: > > On Thu, Mar 01, 2001 at 01:36:03PM -0800, Kevin Oberman wrote: > > > > In the past, the MAE ATM switches ran ABR where you specified the MCR > > and traffic was policed at a PCR of 2xMCR, although almost no one at > > the MAEs actually used ABR on their connections. Almost everyone used > > VBR-nrt and many did not even realize that the use of ABR could have > > been beneficial. > > To be even more precise, MAE-ATM runs ABR > nternally, but didn't speak the protocol > over the UNI to the routers. > > In this mode, the switches being used would > emulate VBR-nrt but actually do some input > buffering and shaping to smooth out bursts. > This came in very handy for older router interfaces > which couldn't shape on their own. > > I never had an ABR-speaking router to try it with. > > > With "best effort" PVCs, this really becomes moot although these are > > still technically ABR. > > Agreed, though I'm not famiiliar with details of the > "best effort" service. And I'm pretty sure the reserved > and policed service is still there for folks who still > want to use it. > > Steve > (former target-carrier) > >
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