From: Roberts, Larry (Larry.Roberts@expanets.com)
Date: Wed Sep 04 2002 - 23:46:38 GMT-3
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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