From: Peng Zheng (zpnist@yahoo.com)
Date: Wed Sep 04 2002 - 23:59:43 GMT-3
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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