| 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 |
My customer wants to have the following configuration. We have
questions about how Spanning Tree will react to it.
A B
FDDI +---------------+ +---------------+
==========| DECbridge 620 |============| DECbridge 620 |===========
+---+---+---+---+ +---+---+---+---+
| | | | | |
| | | Ethernet #1 | | |
| | -+--------------------+- | |
| | | |
| | Ethernet #2 | |
| -+----------------------------+- |
| |
Ethernet #3 | | Ethernet #4
--------------+- -+------------
In this configuration, DB620 'A' is the primary linkage to the FDDI
ring for Ethernets 1 & 2. DB620 'B' is the backup. Ethernets 3 and 4
are always live.
Ethernets 1 & 2 need to have backup connections to the FDDI ring
because their life blood application lives on a system connected to it.
Ethernets 3 & 4 can live and be productive if the connection to the FDDI
ring goes away for a while.
Our question is:
"Is this a valid configuration?"
Another way to ask this is, " Is Spanning Tree on the DB620 implemented
on a per port basis (3 ethernets and 1 FDDI all separate) or by the
single unit itself (any port breaks and the whole units goes into
backup)?
Thanks for any help,
Mark
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1071.1 | per port | ASDS::LEVY | Tue Aug 24 1993 15:08 | 2 | |
ST is implemented on a per port basis. The Bridge & Extended LANs guide
has some examples using multiport bridges.
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| 1071.2 | Where would I find it? | DPDMAI::DAVIES | Mark, SCA Area Network Consultant | Tue Aug 24 1993 17:16 | 9 |
Where would I get the Bridge and Extended LANs guide? Is it part of
the DB620 manual set?
Is it on the network?
Thanks again,
Mark
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| 1071.3 | try VTX LOS | ASDS::LEVY | Tue Aug 24 1993 18:17 | 6 | |
The part number for the Bridge and Extended LAN Reference guide is
EK-DEBAM-HR.
It doesn't ship with any of the bridges; it has to be ordered
separately. Unfortunately, I don't have a network pointer for it
either.
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| 1071.4 | always alternatives | BRAT::BUKOWSKI | Tue Aug 31 1993 11:04 | 6 | |
That will work, but it is a wast of Ethernet ports. You can only have
one active path at any time. Also, the DB620's would still be a single
point of failure. Maybe a LANbridge 200 between the two separate
segments would be the best way to provide backup.
Mike
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