| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
As there's been no answer to a similar question (1004.0) some months ago I post here a problem we have for a great campus (40 buildings) FDDI project, where we have to address both 2 requirements that FDDI classically address: - high-speed stations or servers access - interconnecting many Ethernet LANs On a global point of view, new DEChub900 based offer will be well suited We have designed a more detailed topology derived from various customer workgroups/departments needs : the conclusion is - a global FDDI backbone (mostly dual-ring, but with several trees added) - a number of LANs, both Ethernet AND *FDDI* No problem regarding 100/10 bridging (either with DECbridge 5xx/6xx, or with soon announced DECbridge 900) But the question arises when connecting "local" FDDIs to the backbone. The customer states that creating a "global" FDDI LAN would be a pain and would lead to a similar situation as now with many Ethernet on a single backbone. Apart from Gigaswitch or DECNIS, and given the fact that we build the whole architecture around DEChub900, has anybody something to suggest.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1188.1 | Hopeless issue ?... | LFOIS1::MOUSSU | so unusuaL terM | Wed Jan 05 1994 13:47 | 2 |
Are there no plans for addressing those FDDI-FDDI bridging requirements... | |||||
| 1188.2 | for many FDDIs, the answer is GIGAswitch | MUDDY::WATERS | Thu Jan 06 1994 09:32 | 9 | |
The plan to connect multiple FDDI LANs together is GIGAswitch.
If the number of FDDI LANs is very small, then DECNIS and perhaps
DECbridge 900 will work. (I have no idea if or when DECbridge 900
will allow several FDDI-port modules to act as a small multi-port
bridge.) If you have trouble getting DEChub answers in this conference,
ask in noted::hub_mgnt (which addresses hub products only, and is not
limited to network management questions).
I hope you will post any findings here in the FDDI conference.
| |||||
| 1188.3 | KONING::KONING | Paul Koning, B-16504 | Thu Jan 06 1994 12:43 | 9 | |
DECbridge-900 is not a way to do FDDI to FDDI bridging. Yes, you can connect two of them together by way of their Ethernet ports, and FDDI packets arriving on one of them will come out the other. But in between they will go over an Ethernet, at 10 Mb/s, 1500 byte packet size limit, etc. So while it technically works, it does not make any practical sense. (Well, not as a normal case. It may be a useful failure mode case, and for that it will give you service. But Ethernet grade service, not FDDI grade service.) paul | |||||