| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 3062.1 | If it remains a local config as shown, it's fine... | NETCAD::BATTERSBY | | Tue Dec 12 1995 10:51 | 14 |
| It will work ok, especially if it's not going to a physical
backbone. Where you run into trouble with cascaded DELNI's is
when there may multiple repeater hops, and a very large backbone
infrastructure, meaning more opportunities to eat up preamble
budget. Try contacting someone like Dick Kirk NPSS::KIRK for a
more definitive answer as to what is "officially" support and
what isn't. If Dick can't give you a definitive answer, he should
be able to send you in the right direction.
You may also want to browse in the Ethernet notes conference for
information on DELNI configs. However, I personally don't think you
are going to experience problems in your small network config that
isn't going to a large backbone.
Bob
|
| 3062.2 | A More Complete Picture of the Network | LAVC1B::GAMBARDELLA | Gamby Gumba | Wed Dec 13 1995 14:05 | 41 |
| I realize now that I should have given a more complete explanation of this
customers network. My original diagram only showed the area that I was
concerned with. This is part of a large network and the scenario of
DELNI to DELNI to DECSwitch happens on other ports on the same DECSwitch and
happens on 3 other nodes on the FDDI ring. There are also DEMPRs hung off of
the DELNIs. The ring is also connected to a large ethernet backbone.
This changes the picture quite a bit. So is this configuration supported?
Thanks,
Mike Gambardella
The 1st 3 switches This last
are configured one connects
similarly with to an ENET
DELNIs and DEMPRs backbone
Delni Delni +--+ +--+ +--+ +--+
+------------+ +------------+ |1A|-----|1B|-----|1A|-----|1B|
|12345678 G | |12345678 G | | | | | | | | |
+------------+ +------------+ |1B|-----|1A|-----|1B|-----|1A|
| | | | | | | | | | | |
| +------+ + DETPM------>|2 | |2 | |2 | |2 |
+--------+ | | | | | | | |
| |3 | |3 | |3 | |3 |
+----------+ | | | | | | | |
| Dempr | |4 | |4 | |4 | |4 |
+----------+ | | | | | | | |
|5 | |5 | |5 | |5 |
| | | | | | | |
Delni Delni +--->|6 | |6 | |6 | |6 |
+------------+ +------------+ | | | | | | | | |
|12345678 G | |12345678 G | | |7 | |7 | |7 | |7 |-+
+------------ +------------+ | +--+ +--+ +--+ +--+ |
| | | | | |
| +------+ + DETPM--+ to ENET
+--------+ backbone
|
+----------+
| Dempr |
+----------+
|
| 3062.3 | NO, plain and simple, NOT supported.... | NETCAD::BATTERSBY | | Wed Dec 13 1995 14:33 | 16 |
| Yes you should have been more clear of course. It usually
helps if we have the most concise & complete depiction of
your configuration if you wish us to provide you an answer.
No, you lose, do not go past GO. Find a way of eliminating the
cascaded DELNI's. Let's put this another way, many customers
cascade a pair of DELNI's (in several places on their LANs mind you).
They don't have problems per-se, but they are inviting problems
with preamble budgets being eaten up, and then eventually they
end up with problems.
There are many and numerous horror stories with sites with cascaded
DELNI's that went un-detected, with numerous hours spent on site
troubleshooting problems only to find out it was something like a
single pair of cascaded DELNI's causing wierd network problems.
So, beware of proceeding further down this well-trodden path.
Bob
|
| 3062.4 | Thanks - that's what I thought. Sorry for the confusion. | LAVC1B::GAMBARDELLA | Gamby Gumba | Wed Dec 13 1995 16:31 | 0 |
| 3062.5 | Delnis & demprs & Desprs oh my | PTOJJD::DANZAK | Pittsburgher � | Sun Dec 17 1995 20:07 | 28 |
| Of course, if you did the AUI port on the DECswitch you could do AUI
from DECswitch to any OTHER (non-global) DELNI port and it would work
fine.
DELNI 1 DELNI 2
12345678G 12345678G
| +------+ |
| --------->AUI port on DECswitch
DEMPR etc...
I believe the rule is that cascaded DELNIs can cascade from ONE DELNI
in which the global port is NOT used. In this case, DELNI #2's global
port is NOT used, others may cascade FROM it, but it acts like the lan
backbone.
Delnis and demprs and desprs oh my.....delnis and demprs and desprs oh
my....
(sing the above to the Wiz of Oz tune of Lions and Tigers and Bears oh
my....)
ttfn,
j
^--who lost it
|