OSPF and Forcing a Subnet

Shahab Vahabzadeh sh.vahabzadeh at gmail.com
Sat Jul 20 19:30:34 UTC 2013

Dear Friends,
I have an OSPF over GRE configuration sending you below in which I have
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
>  tunnel source
>  tunnel destination
> interface GigabitEthernet0/0
>  description UPSTREAM - INTRANET
>  ip address
> interface GigabitEthernet0/1
>  description CONNECTED ROUTER
>  ip address
> router ospf 10
>  log-adjacency-changes
>  area 10 range
>  passive-interface default
>  no passive-interface Tunnel0
>  network area 10
>  network area 0
> ip route
> ip route
> ip route
> ip route


Shahab Vahabzadeh, Network Engineer and System Administrator

Cell Phone: +1 (415) 871 0742
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