| 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 |
Also posted in Cluster conference. This is an extension of 387.
The reply to 387 says bridge is optional. But the DEcbridge 6xx
existence is myu worry. 387 in FDDI was not posted by me.
Alphonse
<<< SPEZKO::NOTESPUBLIC:[NOTES$LIBRARY]CLUSTER.NOTE;2 >>>
-< + VAXclusters + >-
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Note 3715.0 Dual rail but bridge between rails No replies
GIDDAY::STANISLAUS 67 lines 14-JUL-1993 12:21
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Question:
SCA in a MI cluster with LAVc running on dual rail (one FDDI and
one Ethernet) where the two rails are bridge via DECbridge 6xx units. I
undertsand this is a "NO NO" for DECnet and LAT. But the question is can
LAVc run on the dual rails. Again I understand that LAVc can run on dual
rails without bridges joining the two rails. What happens if the dual rails
(one FDDI and one Ethernet) are bridged as shown below. Is this dual rail
configuration supported for running LAVc ? The DECbridge 6xx is my worry.
What happens for example if the DECconcentrator power fails. Will
the clsuter continue because every node can see each other on the
Ethernet ? Assume satellites have no votes.
Config diagram.
______________ <--Lanbridge 200 between--> __________________
Ethernet Seg B Seg B and Seg D Ethernet Seg D
to DB620 #1 to DB620 #2
| |
| |
v v
-------------------
||-----------------
|| ||
|| ||
DB620 DB620
#1 #2
Ethernet _________ || ||
Seg D to DB620 #1 || ||
Pilot Seg D ----DC500--------|
------------------
| | | |
| | | | <--- Fibre cables fom system to DC500
v v v v
D D D D
E E E E
M M M M
F F F F
A A A A
| | | |
9 9 6 6 8
0 0 4 4 5
CPU TYPE ---> 0 0 2 2 3
0 0 0 0 0
| | | | |
D D D D D
E E E E E
M M B B B
N N N N N
A A A A A
| | | | |
| | | | | <--- Ethernet Drop cables to H4005
v v v v v Note 8530 has no FDDI board.
___________________________________________________Ethernet Seg A.
connected to
DB620 #1 and #2 as
well
I can send a FAX if required.
Alphonse
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1024.1 | KONING::KONING | Paul Koning, A-13683 | Wed Jul 14 1993 15:09 | 16 | |
I can't answer the LAVC specific question. On the other question -- what happens if the concentrator loses power: the usual thing for a dual ring. If a station or concentrator on the dual ring fails, the ring wraps at that point. The remaining stations on the dual ring continue to see normal connectivity (as does anything connected to them). If you get a failure in TWO places on the dual ring, you get wraps at both points, which partitions the network into two pieces. So in the particular example you showed, a concentrator failure wraps the dual ring at that point (more precisely, at the bridge ports that connect to the concentrator). The two bridges still see each other, and from the point of view of nodes connected to the bridges, nothing has changed. paul | |||||