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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

2132.0. "Ring Inits?" by CHEFS::PACK_J (Cloud Base is heaven) Thu Sep 05 1996 11:03

    
    If we have a vanilla FDDI ring with four DECConcentrator 900's, four
    DECSwitch900EF's dual homed between the concentrators and four VAX's
    with DEMFA's plug into the concentrators and the cluster stays up -
    
    Should we expect to see any 'ring inits' logged on the MAC counters of
    the concentrators?
    
    If a VAX is rebooted how many ring inits would we get? (one when the
    micro code is flushed off the DEMFA and one when it gets put back and
    the DEMFA starts?) ?
    
    Are ring inits bad? My expectation is so see none in a stable Ring
    correct?
                                                 
    
    :J

T.R Title User Personal
Name Date Lines

2132.1 Are you getting lots of inits? NETCAD::ROLKE Interrupt Driven Herefords Fri Sep 06 1996 08:15 21

T.R	Title	User	Personal Name	Date	Lines
2132.1	Are you getting lots of inits?	NETCAD::ROLKE	Interrupt Driven Herefords	`Fri Sep 06 1996 08:15`	21
	> Should we expect to see any 'ring inits' logged on the MAC counters of > the concentrators? > > If a VAX is rebooted how many ring inits would we get? (one when the > micro code is flushed off the DEMFA and one when it gets put back and > the DEMFA starts?) ? This sounds correct to me. There is a ring initialization for any membership change event. If you are dual-homed then you can plug and unplug the backup link all day without a ring init. > Are ring inits bad? My expectation is so see none in a stable Ring > correct? Ring inits are not necessarily bad. They must be taken into context with other counters and activity on the ring. On a stable ring you should have no inits. If you do have inits then you have to hunt around to see if any members have error counts that could implicate a bad section of fiber/wire. If nodes are added or removed then you can expect counts. Chuck

>    Should we expect to see any 'ring inits' logged on the MAC counters of
>    the concentrators?
>    
>    If a VAX is rebooted how many ring inits would we get? (one when the
>    micro code is flushed off the DEMFA and one when it gets put back and
>    the DEMFA starts?) ?

This sounds correct to me.  There is a ring initialization for any
membership change event.  If you are dual-homed then you can plug
and unplug the backup link all day without a ring init.
    
>    Are ring inits bad? My expectation is so see none in a stable Ring
>    correct?
 Ring inits are not necessarily bad.  They must be taken into context
with other counters and activity on the ring.  On a stable ring you
should have no inits.  If you do have inits then you have to hunt around
to see if any members have error counts that could implicate a bad 
section of fiber/wire.  If nodes are added or removed then you can
expect counts.

Chuck