[Cu-wireless] Re: Cu-wireless digest, Vol 1 #138 - 3 msgs
The Morenz Family
mmorenz at ameritech.net
Tue May 28 12:33:27 CDT 2002
Hi David, et. al.
Replies inline...this is off the top of my head, so bear with any
silly mistakes. I'm rushing out the door:
>Date: Sun, 26 May 2002 13:11:32 -0500
>From: David Young <dyoung at ojctech.com>
>To: cu-wireless at lists.groogroo.com
>Subject: Re: [Cu-wireless] Re: Cu-wireless digest, Vol 1 #134 - 3 msgs
>Reply-To: dyoung at pobox.com
>Must an NBMA network have a D.R.? If we set every router's priority for
>election as D.R. to 0, do we get broken routing or working routing w/o
>any D.R.'s ?
In a multiple access scenario ("the MA in NBMA"), Designated Router
elections are necessary since DR's are the only routers to forward
link-state updates. Like any election, it can be rigged. But when you
set them *all* to "0" I believe you are essentially preventing DR
election and breaking the routing. I'd have to defer to Jon or
Stephan on this.
>Suppose we enumerate the hosts on a pod (there are at most 16 or 32),
>and we make each a point-to-point link. Will that work?
Yes or no, depending on the topology. Once you do this, you must have
a series of point-to-points (completely hierarchical) or
point-to-multipoint (extended star) and then DR elections will not
take place. Since you are committed to at least a partial-mesh in
your design specs, I think pmp is the only option (with the
accompanying drawbacks), as I stated earlier.
>Suppose, too, we enumerate the hosts on an uplink network and make each
>a point-to-point link?
>It is more clear all the time that OSPF is not the routing protocol we
>want to use. I think that the protocol we do want to use, we will have
>to program ourselves to operate in Zebra. It is probably DSDV, AODV,
>or one of the other new-fangled routing protocols for ad hoc networks.
I wasn't aware of those until you mentioned them. From what I'm
reading of them, they're all still being tested. We would truly be on
the edge of the envelope. Good way to get a grant, I'd say...
I may not make the meeting tonight, so I can't commit to being your
lecturer, sorry. There are certainly some others who can comment on
OSPF more expertly than I can.
Does anyone know the answer to my earlier question...can you have
more than one subnet/logical network on the same channel in the same
airspace? That would be a prerequisite, it seems to me, to do the PMP
design that we're thinking of.
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