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Conference 7.286::fddi

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

1504.0. "DualHoming- Gigaswitch & FDDI concentrator ?" by QCAV01::PANKAJ () Mon Nov 21 1994 08:15

Hi Gurus,

	Digital India's most prestigeous customer " Super Computing
	Research Center" wants to use his GIGAswitch/FDDI in following 
	DualHoming  FDDI configuration.

	He wants primary (active) links to be on gigaswitch ( so he can
	enjoy the benefits of FDDI switching by GIGASwitch) and standby links
	on his FDDI concentrator ( if Gigaswitch fails , connection via
	FDDI concentrator become active ).

	FGL-2 card will be configured as M ports for dual homing.
	Release notes do not talk about this kind of configuration.
	

	+---------------+		+---------------+
========! GigaSwitch	!===============! FDDI		!==========
< fddi	! FGL-2 cards	! Fddi ring	! Concentrator	! Fddi ring->
========!		!===============!		!===========
	+---------------+		+---------------+
	M!     M!     M! port		!M	!M     !M port
	 !	!      !		!	!      !	
Active	 !	!     B	\	       / A	!      ! Standby Links	
Links	 !	!	 +------------+		!      !	
	 !	!	 ! IBM Host   !		!      !
	 !	!	 !  DAS	      !		!      !
	 !	 \	 +------------+	       /       !
	 !	  \________	   ___________/	       !
	  \		 B|________|A		      /
	   \		  |DEC host|		     /
	    \		  | DAS    |		    /
	     \		  +--------+		   /		
	      \___________	     _____________/
			B|	     |A
			 +-----------+
		         | DAS Host  |
			 +-----------+	 	

	--------  Three more hosts  in same configurations------	


	Will this network work?
 	Is it a valid configuration? Is it a supported conguration?
	Will failover ( standby ) links work in this config?
	Switching timing in failover situtaion?
	What issues , you see in this configuration? 	
	Your opnion about this config ?
	
	Thanx in advance for any help / Pointers.
	If you need any more inputs from me pls let me know.
	
	Pls help .

	Regards,

	Pankaj
PS:  CrossPosted in Gigaswitch and FDDI notes.

T.R Title User Personal
Name Date Lines

1504.1 NPSS::MDLYONS Michael D. Lyons - Young enough and dumb enough Mon Nov 21 1994 10:58 5

T.R	Title	User	Personal Name	Date	Lines
1504.1		NPSS::MDLYONS	Michael D. Lyons - Young enough and dumb enough	`Mon Nov 21 1994 10:58`	5
	I replied in the GIGAswitch notes conference in more detail, the quick summary is that it will work, but note that because GIGAswitch/FDDI ports are bridge ports, the B->A and A->B transitions have different implications (possible spanning tree reconfiguration, 802.1d preforwarding and GIGAswitch port initialization).

        I replied in the GIGAswitch notes conference in more detail, the
    quick summary is that it will work, but note that because
    GIGAswitch/FDDI ports are bridge ports, the B->A and A->B transitions
    have different implications (possible spanning tree reconfiguration,
    802.1d preforwarding and GIGAswitch port initialization).