Conference 7.286::fddi

1539.0. "Huge FDDI/ETHERNET configurationn question ?" by MARS03::THOMAS () Tue Dec 27 1994 06:29

    
	I have posted here a note that is posted in HUB_MGNT.
    
    	Thank you for your answer.
    
    	Regards,
    
    	Bernard THOMAS
    
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Note 1819.0       huge FDDI/ETHERNET configuration questions ?        No replies
MARS03::THOMAS                                      115 lines  23-DEC-1994 03:59
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	My customer uses a big ETHERNET LAN on a site of 2 km * 2 km, with
about 20 ETHERNET segments that are linked with optical fibers (100/140 and
62.5/125) and LB 100/150. He has some automatic backup links with TRANSLAN at
256 or 512 kb/sec.

	Here is the main part of his topology.

===== 	ETHERNET segment
I	optical fiber
!	256 or 512 kb/sec
B	LB 100/150
T	TRANSLAN
R	DR 90/100/200
			=====	=====	=====
			R	R	R
			I	I	I
			I	I	I
			R	R	R
			=====================
				T	B
				!	I
				!	I
				T	B
		     ================================
			T	R		T	
			!	I		!
			!	I		!
			T	R		T
		=====================   ==============
		T		B		T
		!		I		!
		!		I		!
		!		B		T
		!	=============	==============
		!		 R		R
		!		 I		I
		!		 I		I
		T		 B		R
		=========================================
			T		R
			!		I
			!		I
			T		B
			======		=======


	I want to migrate this ETHERNET LAN to an FDDI + ETHERNET LAN.
The ETHERNET segments that will be changed to FDDI concentrator + FDDI/Ethernet
bridge are replaced by FFFFFF on the topology. 

	I will have an FDDI logical ring, but not a physical one, at the
beginning.
	
	I will use DEChub 900 with DECswitch900-EF, DECRepeater900-FP and
DECconcentrator900-MX.

FFFF 	DECconcentrator900 + DECswitch900-EF
II	62,5/125 Optical fibers used in a FDDI ring
B	DECswitch900 ou LB 100/150
R	DR100,200,90,900

			=====	=====	=====
			R	R	R
			I	I	I
			I	I	I
			R	R	R
			=====================
				T	B
				!	I
				!	I
				T	B
		     FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
				II		B	B	II
				II		I	I	II
				II		I	I	II
				II		B	I	II
		FFFFFFFFFFFFFFFFFFFFFFFF     =======	I	II
				B			I	II
				I			I	II
				I			I	II
				B1			B2	II
			=============		     =======	II
				 R			R	II
				 I			I	II
				 I			I	II
				 B			B	II
		FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
			V		I
			!		I
			!		I
			V		B
			======		=======


	If there is a choice, i want that the spanning tree in this
FDDI/ETHERNET LAN use FDDI links by default and only ETHERNET links for backup
purposes, that is to say that B1 and B2 are in STAND BYE.

	I want that the backup of B1 and/or B2 are automatic.

	Is it possible to configure the LB100/150 and DECswitch900 bridges on
this LAN to have this behaviour ?


	Thank you for your answers.


	MERRY CHRISTMAS and HAPPY NEW YEAR.


	Regards,


	Bernard THOMAS

    
    Answered in HUB_MGNT