Date: Mon, 6 Sep 2004 09:07:34 +0200 (CEST) From: Harti Brandt <harti@freebsd.org> To: Ted Mittelstaedt <tedm@toybox.placo.com> Cc: freebsd-atm@freebsd.org Subject: RE: Question on ATM w/ FreeBSD Message-ID: <20040906090324.A16723@beagle.kn.op.dlr.de> In-Reply-To: <LOBBIFDAGNMAMLGJJCKNIEDNEPAA.tedm@toybox.placo.com> References: <LOBBIFDAGNMAMLGJJCKNIEDNEPAA.tedm@toybox.placo.com>
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On Sat, 4 Sep 2004, Ted Mittelstaedt wrote: TM>> If your card does not support VPI 1, you need a small ATM switch to move TM>> ATM PVCs from one VPI to another. Fore ASX-200BX is excellent small and TM>> cheap switch. TM>> TM> TM>Are any of the cards mentioned - Fore LE155, PCA-200, HE155, not support TM>VCI 1? ^^^ VPI probably? The HE155 has a configurable VPI/VCI space of 12 bits that you can split between VPI and VCI. Per default the driver uses 2 VPI bits and 10 VCI bits. The PCA-200 definitely can do only VPI 0. For the LE155 I don't remember. harti TM>> > My suspicion is that it's going to end up being Routed. The reason why TM>> > is that we are already using a different group within this carrier to TM>> > provide Frame Relay to customers -ie: we buy Frame circuits from their TM>> > network to supply bandwidth to customers. Basically it's ATM vc's from TM>> > us to their ATM switch which interworks it to a Frame circuit that the TM>> > end user sees on the usual T1. That is of course a completely separate TM>> > DS3 than what we are looking at buying. But the circuits provisioned TM>> > off that are Routed not bridged, and all5snap, and vbr. TM>> > TM>> > It would also almost certainly be a single VC on the DS3. TM>> > TM>> > DSL egress in this market, by contrast, is all Bridged, both TM>> with Verizon TM>> > and Qwest. (we have both those ilecs here, ugh) They both use vbr and TM>> > aal5mux. TM>> > TM>> > I have another question for you guys,- if I am using routed/vbr TM>> is there any TM>> > benefit to using a forerunner he155 and the fatm() driver as opposed to TM>> > a Fore LE155 with the idt() driver? Also, what exactly is the TM>> difference TM>> > between a Fore LE155 and a Fore PCA-200 (which uses the hfa() driver I TM>> > understand)? TM>> > TM>> > You are right in there being no cheap IDT77252 cards out there. I don't TM>> > have $2-3K on this project to throw into atm pci cards. :-( TM>> No real need to get HE vs LE. I am doing all of this on linux on LE TM>> card... TM>> TM>> > Has anyone worked with the Ascend/Lucent/Avaya PSAX gear, like the PSAX TM>> > 100? Is that an ATM switch that could run a VC from one interface to TM>> > another? The documentation on Avaya's site is very unclear plus the PSAX TM>> > 100 has been long discontinued. But because of that they appear to be TM>> > rediculously cheap on the secondary market. TM>> Like I said, take ASX200BX - it is still supported. TM>> TM> TM>The switch chassis themselves are cheap enough on Ebay. But where you run TM>into trouble is the DS3 cards for them usually aren't included with the TM>switches, and are a lot harder to find secondhand. Not impossible, though, TM>but rarer. TM> TM>And I don't much care about the supported/unsupported aspect of the TM>equipment TM>I use anyway. I'm the first line of support here. And the user community TM>like the mailing list here, is the second line. And it doesen't make a TM>lot of sense to spend $2K a year on a support contract with Cisco for a TM>used 7206 that you bought off Ebay. For starters you don't get hardware TM>support anyway, and secondly, I've used Cisco support enough times in the TM>past to know that they aren't much good for the truly knotty problems. If TM>we are buying used Fore switches/atm cards/ etc. I am not expecting any more TM>support than a copy of the user manual. Remember this is all going into TM>a FreeBSD router that will be running BGP, so I'm already on my own for TM>support there, anyway. TM> TM>The Lucent PSAX gear I've seen on the secondary market, some of it is TM>going for under $100. Compared to a used Fore ASX200BX at $800+, to me that TM>is worth screwing with it - that is, if anyone can possibly confirm that TM>the PSAX even is an ATM switch. TM> TM>Call Cisco support sometime and ask them why your 7206 running 12.0.7T TM>IOS reboots about once a month or so. That's support for you. TM> TM>Ted TM> TM>> > TM>> -alex TM>> TM>> TM> TM>_______________________________________________ TM>freebsd-atm@freebsd.org mailing list TM>http://lists.freebsd.org/mailman/listinfo/freebsd-atm TM>To unsubscribe, send any mail to "freebsd-atm-unsubscribe@freebsd.org" TM> TM> TM>
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