Newsgroups: comp.dcom.sys.cisco Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!zaphod.mps.ohio-state.edu!wuarchive!uunet!shearson.com!viktor From: viktor@shearson.com (Viktor Dukhovni) Subject: bridging FDDI Message-ID: <1991May26.165659.4362@shearson.com> Sender: news@shearson.com (News) Organization: Lehman Brothers References: <35356@boulder.Colorado.EDU> Date: Sun, 26 May 91 16:56:59 GMT William "Chops" Westfield writes: >local media. Cisco currently doesn't support transparent bridging to >or from FDDI at all - while not conceptually difficult, transparent >bridging potentially requires filtering (discarding) FDDI packets >at media rate (400k pps or so). This can be done with special hardware, >but it's a bit beyond the capability of even the RISCy VLIW buzzword >buzzword bitslice processor on cisco's current FDDI card. In addition, >the FDDI chipset needs to be able to tell which frames to strip from >the ring, even though neither the source nor destination address matches >the local address. This capability is not present in the current >implementation either (ah, the curse of being first). So transparent >bridges ought to interoperate ok, but they aren't common yet. Can one conclude this means that "helper-address" and ip flooding are not available for FDDI? -- Viktor Dukhovni : ARPA <...!uunet!shearson.com!viktor> : UUCP 388 Greenwich St., 11th floor, NY, NY 10013 : US-Post +1-(212)-464-3793 : VOICE