OSPF and Forcing a Subnet

Sun Jul 21 05:05:48 UTC 2013

Dear Randy,
Thanks for your help, but 172.16/16 belong to that region and for example
172.17/16 belong to another one and I want to ospf bring me the whole
subnet not which I used.
And summary-address does not to this for me.
Thanks

On Sun, Jul 21, 2013 at 1:21 AM, Randy <randy_94108 at yahoo.com> wrote:

> 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 at gmail.com>
> >To: Jon Lewis <jlewis at lewis.org>
> >Cc: nanog <nanog at 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 at 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
> >
> >
> >
>

-- 
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