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-----Original Message-----
From: Paul Koning <paul_koning at dell.com>
Sender: owner-hecnet at Update.UU.SE
Date: Sat, 16 Jul 2011 17:46:09 
To: <hecnet at Update.UU.SE>
Reply-To: hecnet at Update.UU.SESubject: Re: [HECnet] DECnet et al


On Jul 16, 2011, at 5:40 PM, <hvlems at zonnet.nl> wrote:

Ok, so the convention that the output of the SHO NET command always lists the area router with the highest address is just a display rule. It has nothing to do with an "active" area router then?

I can't find the rule for what L2 adjacent router to pick if you're an L1 router going out of area.   It may be that this is where "highest" kicks in.

For non-adjacent L2 routers, the L1 router doesn't have any idea which router is represented by the "nearest L2 router" pseudo-address zero.   It can't know that.   

	paul

------Origineel bericht------
Van: Paul Koning
Afzender: owner-hecnet at Update.UU.SE
Aan: hecnet at Update.UU.SE
Beantwoorden: hecnet at Update.UU.SE
Onderwerp: Re: [HECnet] DECnet et al
Verzonden: 16 juli 2011 23:25


On Jul 16, 2011, at 3:42 PM, Johnny Billquist wrote:

On 2011-07-16 19.18, hvlems at zonnet.nl wrote:
I'm not sure what the router rules are. There are 63 areas, each with
one actove area router. There may be more routers configured as an area
router in one area; the one with the highest (?) DECnet address is
selected as the active one.

As far as I know, there can be more than one active area router. Just look at what the next hop are for different nodes in your node list... :-)

The way it works is that address 0 in the level 1 routing data corresponds to "nearest L2 router".   Any L2 router contributes to that.   The L1 routers don't know or care who is the nearest L2 router, they only care which direction to send to get there. 

	paul


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