From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sat Jan 24 2004 - 13:47:29 GMT-3
Here is a post I made a few months back on this subject:
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
but advertise a host route for each end-point. 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 is put
in its own OSPF area, use the area range command to summarize the /32s so
other routers only see the summarized route.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Hossam
Sent: Saturday, January 24, 2004 5:24 AM
To: ccielab@groupstudy.com
Subject: Host Address (x.x.x.x/32) on OSPF Point-Multipoint Links!
Hi,
When we configure OSPF on Frame-relay with the point to multipoint option,
OSPF starts to advertise a x.x.x.x/32 host route for the FR link subnet.
Is there any way to force OSPF not to advertise the x.x.x.x/32 routes to
neighbours?
I mean something like "no peer neighbourroute" on PPP!!!
Thanks
SAM
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