Conference marvin::decnet-vax_extensions

854.0. "Phase IV / IV+ differences, background etc ?" by CHEFS::BARKER_E (Ummm...) Tue Feb 11 1997 10:13

    Hi,
    
    	Apologies if this is the wrong notesfile ...
    
    	What is the difference between Phase IV and Phase IV+ ?  We have a
    number of Cisco routers and DECbrouters that see each other as either
    Phase IV adjacencies or Phase IV+ adjacencies.  We are having problems
    that appear like comunications between Phase IV and IV+ routers isn't
    working properly across our config. but it would be nice to know what
    the differences are, where there are specs available etc.
    
    	Any info would be gratefully received,
    
    	Thanks,  Euan Barker

 Phase IV+ is only used on Token Ring.  Phase IV Plus does not require
the system the change it's hardware address to aa-00-04-00-..-..

look at http://www-esn.lkg.dec.com/netarch/approved/trn_dlspec_v100.ps

    I thought that was Phase IV Prime, or are they one and the same ?  This
    network has no Token Ring but the Cisco Routers/DECbrouters show 
    themselves in some cases as Phase IV and in some cases as Phase IV+,
    
    Thanks,
    
    		Euan

Oops.  You're right.  That'll teach me to note early in the morning.

Phase IV+ add a separate L2 multicast for routers and a few other 
things.  I don't Phase IV+ matters unless you are an area router.