The IP Over NBMA (ION) Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Maybe RSVP and Q.2931, but not NHRP
In a message dated 96-06-06 23:33:37 EDT, mohta@necom830.hpcl.titech.ac.jp (Masataka Ohta) writes: >> >> In the TTI VLAN router, switching from one VLAN to another >> >> is equivalent to loading a register with a new value. >> This operation takes place transparently as the packet switch >> control sofware executes. In IP terminology >My original statement is that: > >> Making something logical only add unnecessary management burden with > >> no real benefit. >if the operation is transparent to IP and unfamiliar to IP administrator, >it's burden is worse. I am not sure what you mean. It seems to be an argument against subnet masks, which have been immensely useful albeit something of a kludge. >But, wait. >> A subnetwork simply >> does not necessarily correspond to a single physical >> interface. >Hmm, you only mean you can configure physically contiguous interfaces >into a single subnet, don't you? If so, it is not as bad as "logical" >and there is no reason to call it "logical", except that there is >hype that something logical "were" good. Usual English terminology for hiding the hardware details is either logical or virtual. Unix and Multics provide logical IO. X allows a high resolution raster graphics device to serve as multiple virtual high resolution raster graphics devices. In the case of the TTI VLAN router, the device is logically equivalent to multiple LAN switches which are interconnected by a router (functionality) operating at bus bandwidth. The ports which are grouped to form a single logical LAN (or WAN) switch need not actually be physically contiguous. I tend to prefer to the term "logical" to "virtual" because in Spanish "virtual" often has the connotations of "real" in English. Unfortunately, my term "Logical SubBridge" did not catch on and every else uses VLAN. Joachim Martillo Inventor of the VLAN President Telford Tools, Inc. "Garage Mechanics for the I-Way" 17 Pleasant Hill Ave. Dorchester/Mattapan, MA 02126-2813 V: 617-298-1617 F: 617-298-1745 E: Telford001@aol.com |
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