From: CCIE FUN (ccieexam2002@yahoo.com)
Date: Fri Mar 07 2003 - 02:34:05 GMT-3
Hello
First of all using "ip ospf network
point-to-multpoint"
command on R1 won't just solve the issue. I will
explain below why it won't work.
Because if you read the requirements R1 with a
Multipoint interface.
this means just create a multipoint sub-interface
by command int s0.1 multipoint.
Now once you enable OSPF for this interface it just
becomes the non-broadcast interface.
Now include neighbor commands under the routing
process.
Now configure R2 and R3 without subinterface.
here requirements are simpler.
In OSPF a "frame-relay interface" (int s0 for e.g) is
a non-broadcast interface.
This just solves the problem by using same OSPF
network types. It is recommended to make Hub the DR.
Now if you just did configure the mulitpoint
subinterface on R1 using ip ospf network
point-to-multipoint command then u are trying to
create OSPF adjancies over different network types and
the adjancies won't happen.
Because the R3 and R2 are looking for DR or BDR's due
to their opsf network type of Non-broadcast
and R1 is not.
So there are two options
1. use neighbor command on R1
or
2 convert the network types to point-to-multipoint on
all the routers.
--- Khalid Ameen <khalid_ameen@rayaintegration.com>
wrote:
> you can use ip ospf network point-to-multipoint
> without configuring any
> neighbor command on R1
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Scot Peter
> Sent: Thursday, March 06, 2003 6:39 PM
> To: ccielab@groupstudy.com
> Subject: A question on OSPF for NBMA Networks
>
>
> Hi Group,
>
> If we need to configure OSPF on a Multipoint
> interface with the
> following condition,
> - R1 should use Multipoint interfaces,
> - R2, R3 should not use subinterfaces,
> - All three routers should be in the same Network.
> - Don't configure Network type Broadcast or
> non-broadcast.
>
> R1
> / \
> R2 R3
>
> I am not sure about configuring "ip ospf network
> point-to-multipoint" (as it is mentioned not to
> configure
> non-broadcast) or do we need to configure using
> "neighbor"
> command? Please advice me on this.
>
> Thanks
> Peter
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