This was talked about around September. Use the command:
ip ospf network point-to-point
which is available with 11.3 or 12.0
also from: http://www.cisco.com/warp/public/104/9.html#QB
Q: Why are loopbacks advertised as /32 host routes in OSPF?
A: Loopbacks are considered host routes in OSPF, and they're advertised as
/32. For more information, see section 9.1 of RFC 2328. In Cisco IOS ®
version 11.3T and 12.0, if the ip ospf network point-to-point command is
configured under loopbacks, then OSPF advertises the loopback subnet as the
actual subnet configured on loopbacks.
Kevin Wigle
* * * * * * * * * * *
Simon wrote:
Hi Guys / Gals
Does anyone know of a way to make OSPF advertise the loopback network
instead of the host route?
ie:
int lo0
ip add 213.166.24.161 255.255.255.240
comes up in other routers routing tables as:
O 213.166.24.161/32 [110/154] via 213.166.25.17 Serial0.3
when i would like it to look like:
O 213.166.24.160/28 [110 etc etc
Apparently OSPF just treats loopbacks like this, EIGRP doesn't, therefore
the ospf route is always more specific when setting up lab exercises with
redistribution, so its hard to get into trouble!
Simon
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