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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

4191.0. "VN without ATM switch" by HGOM11::HUMPHREYTAN () Wed Jan 29 1997 02:13

    Hi,
    
    Can two VNswitch 900EA be connected through their ATM ports directly?
    I know the DECswitch 400 can do so. How about VNswitch 900EA?
    
    Any comment is appreciate.
    
    Humphrey
    
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4191.1Yes, but a bug of sorts is currently being worked...NETCAD::BATTERSBYWed Jan 29 1997 09:426
    Yes, they can but I'm told that there is some inconsistency about 
    the connection working over a period of time with the current base 
    level of code or something to that affect. The developers apparently 
    know about this and are working the issue.
    
    Bob
4191.2STRWRS::KOCH_PIt never hurts to ask...Wed Jan 29 1997 10:189
    
    Bob,
    
    	That's an interesting response since I heard the opposite at the SE
    Forum. It might be that I didn't understand the response, but
    supposedly the VNswitch 900EA is more like a system (end station) than a
    switch and would REQUIRE an ATM switch to work. 
    
    	Wouldn't this be better posted in the ATM notes conference?
4191.3NPSS::NEWTONThomas NewtonWed Jan 29 1997 13:5916
>>  supposedly the VNswitch 900EA is more like a system (end station) than a
>>  switch

From an ATM perspective, a VNswitch 900EA is indeed an end station.  It does
not switch cells between several ATM ports, which is what an ATM switch does.

>>  and would REQUIRE an ATM switch to work.

This I am not as sure about.

If you are talking about LANE, yes, you need an ATM switch; one reason being
that the VNswitch 900EA has one ATM port and no built-in LANE servers.

If you are talking about Bridge Tunnel PVCs, this seems like something which
should work even without a switch.
4191.4NETCAD::DOODYMichael DoodyWed Jan 29 1997 14:267
    Not on the backplane. In the hub backplane the VNswitch has only 
    "ATM Slave" ports and thus needs to connect to an ATMswitch "master"
    port. 
    
    maybe the other responders were talking about the front-panel ports.
    
    -mike
4191.5Out the front yes....NETCAD::BATTERSBYWed Jan 29 1997 15:583
    Yes I was referring to front panel connections.
    
    Bob
4191.6CSC32::bngpc.cxo.dec.com::goodwinbBrad Goodwin - NSISThu Jan 30 1997 18:2410
Well, since we are being trained on the VNswitch's here at the CSC this week. We
just finished setting up 2 VNSwitchEA's connecting them directly to each other 
on the front ports and they came up fine with a bridge tunnel. They came up
automaticaly we didn't have to do a thing. Apparently they will detect what they 
connected to. If they are connected to a ATM switch, they will come up as a 
LEC. If it is connected to a GS/FDDI with the ATM card, they will come up with a 
FDDI bridge tunnell. If 2 EA's are connected to each other, they will come up 
with an Ethernet bridge tunnell.

Brad