I had a hard time believing that there would be a router that didn't support
multicast until I looked up some old UseNet articles:
From: Nick Filimonov
Subject: Non-multicast point-to-point and OSPF
Date: 1997/04/06
Message-ID: #1/1
Organization: IREX/Moscow
Newsgroups: comp.dcom.sys.cisco
Hello,
I have a Cisco 2501 with 11.2(4) connected to the PC (running gated)
with a synchronous serial. I'm trying to make OSPF work over this link. Both
routers are in the same area. The problem is that synchronous port within PC
does not support multicasting.
After some experiments, we've made both routers to be ajacent, using
"ip ospf network non-broadcast" statement. But, in this case, Cisco assumes,
that Serial0 is not point-to-point, reports that "Link connected to: Transit
network", and finally declares "Adv. router is not-reachable", preventing
direct routes from gated to be installed in the database. Declaring PC as a
"neighbor" does not help.
If I declare "ip ospf network point-to-multipoint", Cisco reports
Serial0 as "connected to: Another router (point-to-point)", temporary gets
FULL state, get routes installed, and after "dead time" losts adjacency
(since
PC can't hear multicasts).
THE QUESTION IS: Is there any way to tell Cisco, that Serial0 is
point-to-point NON-MULTICAST interface, OR to tell OSPF that neighboring
router is reachable via specific interface?
--
Nikolas S. Filimonov,
System Administrator,
IREX/Moscow
--
RFC 1149 Compliant.
""Steven A. Ridder"" wrote in message
news:[EMAIL PROTECTED].;
> Here's what I found on CCO:
>
> The non-broadcast keyword used with the point-to-multipoint keyword first
> appeared in Cisco IOS Release 11.3 AA.
> Using this feature, you can configure broadcast networks as nonbroadcast
> multiaccess (NBMA) networks when, for example, you have routers in your
> network that do not support multicast addressing.
>
> --
>
> RFC 1149 Compliant.
>
>
>
> ""John Neiberger"" wrote in message
> news:[EMAIL PROTECTED].;
> > I've been reading the CCO configuration guides and I now have a
> > question. What is the difference between the following:
> >
> > ip ospf network point-to-multipoint
> >
> > and
> >
> > ip ospf network point-to-multipoint non-broadcast
> >
> > ??
> >
> > More specifically, I really want to know when you would use the latter
> > command. The example given on CCO is if we have excluded the broadcast
> > keyword from a frame relay map. I don't think I've ever seen anyone
> > configure a frame map without that keyword so I don't know why you'd
> > ever want to do that.
> >
> > Any thoughts here?
> >
> > Thanks,
> > John
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=37210&t=37205
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