From: Nick Shah (nshah@connect.com.au)
Date: Thu Sep 05 2002 - 00:40:11 GMT-3
Further to what Larry said...
* you only need the neighbor commands on the DR/BDR
* 2 ways to circumvent the use of neighbor command is to define the network
type as broadcast & or multipoint.
rgds
Nick
----- Original Message -----
From: "Peng Zheng" <zpnist@yahoo.com>
To: "Roberts, Larry" <Larry.Roberts@expanets.com>; <ccielab@groupstudy.com>
Sent: Thursday, September 05, 2002 12:59 PM
Subject: RE: Why neighbor is not required for OSPF configured as ip ospf n
etwork broadcast
> Thanks.
> --- "Roberts, Larry" <Larry.Roberts@expanets.com>
> wrote:
> > OSPF finds its neighbors by multicast, which is a
> > form of broadcast.
> > If it is a non-broadcast interface, ospf has no way
> > of locating its
> > neighbors and forming a relationship.
> > Therefore you must specifically tell OSPF who its
> > neighbors are.
> >
> > On broadcast, it can send to the multicast address (
> > 224.0.0.5 and 224.0.0.6
> > which are "all OSPF router" and "all OSPF DR"
> > respectively )
> > Other OSPF speakers will listen to these IP's
> > address's and respond.
> >
> > I have perhaps overly simplified this a bit, and
> > others can perhaps explain
> > more eloquently, but that is the low skinny of it.
> >
> >
> > Thanks
> >
> > Larry
> >
> >
> > -----Original Message-----
> > From: Peng Zheng [mailto:zpnist@yahoo.com]
> > Sent: Wednesday, September 04, 2002 9:09 PM
> > To: ccielab@groupstudy.com
> > Subject: Why neighbor is not required for OSPF
> > configured as ip ospf network
> > broadcast
> >
> >
> > Hi,
> >
> > In CIM, I saw neighbor is not configured when ip
> > ospf
> > network broadcast is used under interface for OSPF
> > over frame relay.
> >
> > I want to know why? What's the difference between
> > ip
> > ospf network broadcast and ip ospf network
> > non-broadcast? Hello interval and dead-interval are
> > different, anything else?
> >
> > WHat makes neighbor unnecessary when ip ospf network
> > broadcast configured?
> >
> > Thank you for help.
> >
> > Best Wishes,
> > Peng Zheng
> >
> >
> >
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This archive was generated by hypermail 2.1.4 : Mon Oct 07 2002 - 07:43:44 GMT-3