RE: OSPF NBMA Network

From: Antonio Soares (amsoares@netcabo.pt)
Date: Wed Jun 27 2007 - 08:47:22 ART


Same as Point-to-multicast but uses Unicast instead of broadcast.
Does not have DR/BRD.
Host routes are sent to the neighbors.

Sample config for Hub-and-Spoke Topology:

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Hub:
Interface s0/0
 enc frame
 no frame inv
 ip add 10.10.10.1 255.255.255.0
 frame map ip 10.10.10.2 102
 frame map ip 10.10.10.3 103
 ip ospf net point-to-multipoint non-broadcast

Router ospf 1
 net 10.10.10.1 0.0.0.0 area 0
 neighbor 10.10.10.2
 neighbor 10.10.10.3
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Spoke-1:
Interface s0/0
 enc frame
 no frame inv
 ip add 10.10.10.2 255.255.255.0
 frame map ip 10.10.10.1 201
 ip ospf net point-to-multipoint non-broadcast

Router ospf 1
 net 10.10.10.2 0.0.0.0 area 0
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Spoke-2:
Interface s0/0
 enc frame
 no frame inv
 ip add 10.10.10.3 255.255.255.0
 frame map ip 10.10.10.1 201
 ip ospf net point-to-multipoint non-broadcast

Router ospf 1
 net 10.10.10.3 0.0.0.0 area 0
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Please note that we don't have the frame-relay broadcast keyword configured.
We don't have Spoke-to-Spoke mapping but they will be able to ping each
other fr interface via L3 routing.

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Naresh Myaka
Sent: quarta-feira, 27 de Junho de 2007 12:16
To: Cisco certification
Subject: OSPF NBMA Network

Hi GS,

Can anyone help me in understanding the command "IP OSPF NETWORK
POINT-TO-MULTIPOINT NON-BROADCAST" in ospf.

Regards,
Naresh Myaka



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