From: bmanning@ISI.EDU Subject: Re: Comments To: ltwu@faline.bellcore.com (Liang T. Wu) Date: Tue, 30 Aug 1994 08:07:28 -0700 (PDT) Cc: bmanning@ISI.EDU, iepg@iepg.org, nanog@merit.edu, nap-info@merit.edu
Thank you for your insightful comments. I would like to be enlightened on exactly how a proposed migration from RFC1490 to RFC1483/1577 will occur. As I understand it, there needs to be a translation method between NLPID and LLC/SNAP. There seem to be other locations in the stack where translation must occur. Is there capability today or even planned that will do these translations? [...]
I would migrate, rather than translate. Depending on the Cisco 7000 HSSI and/or AIP microcode, an ATM NAP could migrate a PVC at a time or the whole NAP at once. I assume that this migration will occur before NAPs become very large. [By the way, translation between RFC 1490 (NLPID) and RFC 1577 (LLN/SNAP) is still an issue for frame relay interworking units, even if it isn't required for 1490-1577 migration in an ATM-only NAP.] -tjs
Tim sez: Depending on the Cisco 7000 HSSI and/or AIP microcode, an ATM NAP could migrate a PVC at a time or the whole NAP at once. I assume that this migration will occur before NAPs become very large. [By the way, translation between RFC 1490 (NLPID) and RFC 1577 (LLN/SNAP) is still an issue for frame relay interworking units, even if it isn't required for 1490-1577 migration in an ATM-only NAP.] To which Bill queries: Minor confusion here. Say for instance a Convex w/ a Native ATM interface is colocated at an ATM NAP and is running somehting that most NAP customers want to talk to... The Convex is talking LLC/SNAP - AAL5 - RFC 1577. Just how is a Sparc20, on an FDDI ring, attached to a cisco7000, connected via HISSI to an ADSU talking NLPID - AAL5 - RFC 1490 supposed to talk to the Convex? When does it make the tradeoff on talking to the two other Sparc20s, attached by the same 1490 means or the Convex? This sounds like its not practical to do a single PVC at a pop. It sounds to me like all or nothing. But I am not well versed. Can you/ Would you explain it to me in small words? I really want to know. --bill
participants (2)
-
bmanning＠ISI.EDU -
tjs＠msc.edu