From: Ken.Farrington@barclayscapital.com
Date: Sun Dec 07 2003 - 18:09:06 GMT-3
Thats great. i just thought this may be a problem in my IOS but as you have
confirmed,. this is how it is ment to work.
I am happy with that.
many thx
-----Original Message-----
From: Brian Dennis [mailto:bdennis@internetworkexpert.com]
Sent: 07 December 2003 21:00
To: Ken.Farrington@barclayscapital.com; David.Porta003@msd.govt.nz
Cc: ccielab@groupstudy.com
Subject: RE: OSPF Multipoint Sub-ints
Ken,
The behavior of point-to-multipoint is to advertise each end-point
out as a /32 and suppress the advertisement of the network itself.
Point-to-multipoint does this to overcome possible reachability issues
between devices that are on the same logical subnet but do not have direct
communication (i.e. spoke to spoke communication). OSPF point-to-multipoint
and technically loopback network types do not advertise the network itself.
This is as per the RFC.
If you want to suppress the /32s and advertise only the network, you
would need to use an OSPF network type other than point-to-multipoint or
configure the network to be in its own OSPF area. After the network has
been put into its own OSPF area, use the area range command to summarize the
/32s so that other OSPF routers only see the summarized route.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ken.Farrington@barclayscapital.com
Sent: Sunday, December 07, 2003 12:52 PM
To: David.Porta003@msd.govt.nz
Cc: ccielab@groupstudy.com
Subject: RE: OSPF Multipoint Sub-ints
Hi David,
No these are not loopbacks, they are physical serial interfaces. I have to
run these as OSPF P-2-M interfaces, but would like to know if youm can
suppress the /32 hosts routes and generate a network in the routing table
that represents the actual network.
must be morning there :)
Thx very much :)
-----Original Message-----
From: David Porta [mailto:David.Porta003@msd.govt.nz]
Sent: 07 December 2003 20:45
To: Ken.Farrington@barclayscapital.com
Cc: ccielab@groupstudy.com
Subject: Re: OSPF Multipoint Sub-ints
Hi Ken,
I assume that the interfaces in question are loopbacks with a /24 mask. I
assume this because loopback interfaces are advertised as host routes with a
/32
mask.
Therefore in order to advertise them as a subnet with their respective mask,
which in this case is a /24 mask, you will need to use the "ip ospf network
point-to-point" command under the loopback interface config mode.
Please let me know if this worked.
Cheers,
David
Ken.Farrington@barclayscapital.com wrote:
> Me again :)
>
> When running an OSPF P-2-M network type over a FR network (ip network is
> /24), we get the /32 routes in the routing table for all routers that have
> an FR connection to this network. You see the /24 routes in the local
> routers that host the FR network (say 3 routers), but in other routers in
> the same OSPF area or other OSPF areas, you only see the /32 entries and
not
> the /24.
>
> Can this behaviuor be changed so that you advertise the /24 networks to
> other OSPF devices?
>
> Many kind regards,
> Ken.
>
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