From: Steven Weber (itweber@xxxxxxxxxxxxx)
Date: Thu Apr 05 2001 - 02:12:42 GMT-3
sounds good to me :-)
----- Original Message -----
From: "Lachlan Kidd" <lkidd@netstarnetworks.com>
To: "Guy Farber" <gfarber@cisco.com>; "Daniel C. Young"
<danyoung99@mediaone.net>; <ccielab@groupstudy.com>
Sent: Wednesday, April 04, 2001 7:20 PM
Subject: RE: OSPF over NBMA
> Hi Guy,
> As I understand it, point-to-multipoint creates multiple point-to-point
> links between the hub and spokes. Now I may have this next bit
> wrong.....because the links are point to point, the concept of
broadcasting
> becomes redundant. The router assumes that if you stuff data down one end
of
> a p-t-p link it will pop out the other end. Futher to this, in a p-t-mp
> environment, OSPF will inject a /32 route to each of the spokes interfaces
> into the route table. This ensures spoke to spoke connectivity.
> If I've got this majorly wrong can someone please correct me.
> Thanks, Regards,
> Lachlan
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Guy Farber
> Sent: Thursday, 5 April 2001 7:16:AM
> To: Daniel C. Young; ccielab@groupstudy.com
> Subject: Re: OSPF over NBMA
>
>
> Thanks. What does multipoint do to solve the problem?
>
> ----- Original Message -----
> From: "Daniel C. Young" <danyoung99@mediaone.net>
> To: "'Guy Farber'" <gfarber@cisco.com>; <ccielab@groupstudy.com>
> Sent: Wednesday, April 04, 2001 10:33 PM
> Subject: RE: OSPF over NBMA
>
>
> > Also, guy. If your spoke was using a subinterface, you would not see
> > neighbors unless you typed 'ip ospf network point-to-multipoint'. Of
> course,
> > 'ip ospf network broadcast' would work as well.
> >
> > The point is, as Pamela explained, OSPF treats FR (by default) as a
> > nonbroadcast network, which means that the multicasts needed to become
> > neighbors (224.0.0.5) are not sent.
> >
> > Hope this clears it up.
> >
> > Daniel Young
> > Sr. Network Engineer
> > Internet Data Center
> > SBC Service Inc. - ITO
> >
> > (949) 221-1928 Office
> > (714) 350-8945 Cell
> > ICQ# 109846891
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Guy Farber
> > Sent: Wednesday, April 04, 2001 2:57 AM
> > To: ccielab@groupstudy.com
> > Subject: OSPF over NBMA
> >
> >
> > Guys,
> >
> > I have a very simple FR network. One router functions at the FR switch
and
> 2
> > others have a pvc between them. When I run OSPF over the FR link without
> > changing any OSPF interface parameters and using in-arp, hellos are not
> > being sent from the routers. If I change the interface type to
broadcast,
> > they start exchanging hellos and finally build an adjacency. Now for the
> > interesting part, if I put a neighbor statement on one of them they
start
> > exchanging hellos and become neighbors. If I remove the neighbor
statement
> > it stays the same.
> >
> > I'm using 2621 and 3640 with ver 12.1(4)
> >
> > What am I missing here?
> >
> > -------------------------------------------------
> > Guy Farber
> > Systems Engineer
> >
> > Tel: +972 (9) 970-0363
> > Fax: +972 (9) 970-0019
> > GSM: +972 (54) 975-363
> > Email: gfarber@cisco.com
> >
> > Cisco Systems Israel
> > 85 Medinat Hayehudim St.
> > 46766 Herzliya
> > ISRAEL
> > -------------------------------------------------
> > "Programming today is a race between software engineers striving to
build
> > bigger and better idiot-proof programs, and the Universe trying to
produce
> > bigger and better idiots. So far, the Universe is winning."
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