[c-nsp] OSPF for loopback interfaces - /32 instead of /29

[Jeff Tantsura]

Hi Vincent,

It has to do with the network type for loopbacks.

According to RFC 2328:

"OSPF enables the flexible configuration of IP subnets ... Host routes are
considered to be subnets whose masks are 'all ones' (0xffffffff)."

If you want the configured mask configure: ip ospf network-type
point-to-point

Regards,
Jeff

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Vincent De Keyzer
> Sent: dinsdag 6 maart 2007 12:00
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] OSPF for loopback interfaces - /32 instead of /29
> 
> Hello,
> 
> 
> 
> I am surprised of what I see:
> 
> 
> 
> 1)     When I configure X.Y.Z.9/29 as IP for lo1 interface; I don't see
> the
> expected X.Y.Z.9/29 on a OSPF neighbouring router: I only see X.Y.Z.9/32.
> 
> 2)     If instead I put this address as *secondary* IP of lo0, then it
> works
> as expected (I see the /29 route on the neighbour).
> 
> 
> 
> Does that make sense to you? Is this the way loopback interfaces are
> supposed to work?
> 
> 
> 
> Vincent
> 
> 
> 
> 
> 
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