Re: OSPF and Forcing a Subnet

[Randy <randy_94108 () yahoo com>]

what you are seeing is the expected behavior.

you are asking the router to generate a type 3 summary for a type 1 lsa that doesn't exist for area 10 via the "area 10 
range' command" (also, that is why it works when you add a /32 to loopback)

172.16/16 is an external route. If you want to generate a type 5 aggregate use summary-addr as Jon has pointed out. 
Else, leave static in place, redist static subnets but remove "area 10 range 172.16.0.0 255.255.0.0" from ospf config.
./Randy




_______________________________
> From: Shahab Vahabzadeh <sh.vahabzadeh () gmail com>
> To: Jon Lewis <jlewis () lewis org> 
> Cc: nanog <nanog () nanog org> 
> Sent: Saturday, July 20, 2013 12:55 PM
> Subject: Re: OSPF and Forcing a Subnet
>
>
> Dear Jon I have a mistake in my last email, there is a static route like
> this:
>
> ip route 172.16.0.0 255.255.0.0 10.20.76.12
>
> but again it is redistributing
>
>
> On Sun, Jul 21, 2013 at 12:22 AM, Jon Lewis <jlewis () lewis org> wrote:
>
> > You don't have a route for 172.16/16 in the config below, so ospf will not
> > advertise it.  You do have a route for a subnet of 172.16/16, so either use
> > summary-address 172.16.0.0 255.255.0.0 or nail up a static route for
> > 172.16.0.0 255.255.0.0 to null0 and redistribute static subnets, and then
> > ospf can redistribute that static route.
> >
> >
> > On Sun, 21 Jul 2013, Shahab Vahabzadeh wrote:
> >
> >   Dear Friends,
> > > I have an OSPF over GRE configuration sending you below in which I have
> > > problem.
> > > I want to force OSPF to advertise 172.16/16 range without checking
> > > anything.
> > > And as you see I have an static route for it in routing table but again
> > > OSPF do not advertise it, only it advertise when I put one /32 subnet on
> > > loopback interface.
> > > even I put "redistribute static subnets" command with/without route-map
> > > but
> > > again do not work.
> > > I think because of having my providers address range in my static routes,
> > > routers and ospf confused when wanna advertise routers.
> > >
> > >
> > > interface Tunnel0
> > >
> > > >   ip address 128.140.40.2 255.255.255.252
> > > >   tunnel source 10.20.76.2
> > > >   tunnel destination 10.20.75.2
> > > > interface GigabitEthernet0/0
> > > >   description UPSTREAM - INTRANET
> > > >   ip address 10.20.76.2 255.255.255.248
> > > > interface GigabitEthernet0/1
> > > >   description CONNECTED ROUTER
> > > >   ip address 10.20.76.9 255.255.255.248
> > > >
> > > > router ospf 10
> > > >   log-adjacency-changes
> > > >   area 10 range 172.16.0.0 255.255.0.0
> > > >   passive-interface default
> > > >   no passive-interface Tunnel0
> > > >   network 172.16.0.0 0.0.255.255 area 10
> > > >   network 128.140.40.0 0.0.0.3 area 0
> > > > ip route 0.0.0.0 0.0.0.0 10.20.76.1
> > > > ip route 172.16.0.0 255.255.224.0 10.20.76.12
> > > > ip route 10.20.76.0 255.255.255.0 10.20.76.12
> > > > ip route 10.20.77.0 255.255.255.0 10.20.76.12
> > >
> > >
> > >
> > > Thanks
> > >
> > > --
> > > Regards,
> > > Shahab Vahabzadeh, Network Engineer and System Administrator
> > >
> > > Cell Phone: +1 (415) 871 0742
> > > PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81  C2EE 76A2 46C2 5367 BF90
> > ------------------------------**------------------------------**----------
> >   Jon Lewis, MCP :)           |  I route
> >                               |  therefore you are
> > _________ http://www.lewis.org/~jlewis/**pgp<http://www.lewis.org/~jlewis/pgp>for PGP public key_________
>
>
>
> -- 
> Regards,
> Shahab Vahabzadeh, Network Engineer and System Administrator
>
> Cell Phone: +1 (415) 871 0742
> PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81  C2EE 76A2 46C2 5367 BF90