From: Chia Kim Seng, NWSpec, SCS-Networks (chiaks@xxxxxxxxxxxxxxxxxxxxxx)
Date: Mon Apr 03 2000 - 23:34:08 GMT-3
Hi Aaron,
multipoint subinterface allows you to have a point to multpoint connection
using one ip subnet.
If you use point-to-point subinterface, based on your configuration, you
will need to have to create 3 point-to-point subinterfaces each with
different ip subnet.
OSPF will treat multpoint subinterface as a non-broadcast network type.
Without broadcast capability some configuration need to be done for all the
neighboring router to be able to discover each other.
Using point-to-multipoint command allows OSPF treat all routers connnection
as if they are point-to-point. With this it does not require a DR election
can still using only one IP subnet.
There is other ways to configure the router in the NBMA network if not using
point-to-multipoint.
You can use 'neighbor' command or 'ip ospf network broadcast' command.
This 2 command will require the DR election.
May all being be happy and healthy,
Kim Seng
-----Original Message-----
From: Aaron DuShey [mailto:adushey@yahoo.com]
Sent: Tuesday, April 04, 2000 4:12 AM
To: CCIE (E-mail)
Subject: Difference between multipoint subinterface and the ip ospf
point-multipoint command
r6(config)#int se0.1 ?
multipoint Treat as a multipoint link
point-to-point Treat as a point-to-point link
r6(config)#int se0.1 multi
interface Serial0
ip address 10.0.1.1 255.255.255.0
ip ospf network point-to-multipoint non-broadcast
encapsulation frame-relay
no keepalive
frame-relay local-dlci 200
frame-relay map ip 10.0.1.3 202
frame-relay map ip 10.0.1.4 203
frame-relay map ip 10.0.1.5 204
Where would the subinterface multipoint be useful? What is the difference
between a multipoint sub-interface and a multipoint ospf network interface?
thanks
Aaron DuShey
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