[164590] in North American Network Operators' Group
Re: OSPF and Forcing a Subnet
daemon@ATHENA.MIT.EDU (Randy)
Sat Jul 20 16:52:09 2013
Date: Sat, 20 Jul 2013 13:51:37 -0700 (PDT)
From: Randy <randy_94108@yahoo.com>
To: Shahab Vahabzadeh <sh.vahabzadeh@gmail.com>
In-Reply-To: <CAGqGmqZC+wYSAKMvS5noJxLvK=4PjApUUxoH0zQUpKRz+yZK8Q@mail.gmail.com>
Cc: nanog <nanog@nanog.org>
Reply-To: Randy <randy_94108@yahoo.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
what you are seeing is the expected behavior.=0A=0Ayou are asking the route=
r 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 a=
dd a /32 to loopback)=0A=0A172.16/16 is an external route. If you want to g=
enerate a type 5 aggregate use summary-addr as Jon has pointed out. Else, l=
eave static in place, redist static subnets but remove "area 10 range 172.1=
6.0.0 255.255.0.0" from ospf config.=0A./Randy=0A=0A=0A=0A=0A______________=
_________________=0A> From: Shahab Vahabzadeh <sh.vahabzadeh@gmail.com>=0A>=
To: Jon Lewis <jlewis@lewis.org> =0A>Cc: nanog <nanog@nanog.org> =0A>Sent: =
Saturday, July 20, 2013 12:55 PM=0A>Subject: Re: OSPF and Forcing a Subnet=
=0A> =0A>=0A>Dear Jon I have a mistake in my last email, there is a static =
route like=0A>this:=0A>=0A>ip route 172.16.0.0 255.255.0.0 10.20.76.12=0A>=
=0A>but again it is redistributing=0A>=0A>=0A>On Sun, Jul 21, 2013 at 12:22=
AM, Jon Lewis <jlewis@lewis.org> wrote:=0A>=0A>> You don't have a route fo=
r 172.16/16 in the config below, so ospf will not=0A>> advertise it.=A0 You=
do have a route for a subnet of 172.16/16, so either use=0A>> summary-addr=
ess 172.16.0.0 255.255.0.0 or nail up a static route for=0A>> 172.16.0.0 25=
5.255.0.0 to null0 and redistribute static subnets, and then=0A>> ospf can =
redistribute that static route.=0A>>=0A>>=0A>> On Sun, 21 Jul 2013, Shahab =
Vahabzadeh wrote:=0A>>=0A>>=A0 Dear Friends,=0A>>> I have an OSPF over GRE =
configuration sending you below in which I have=0A>>> problem.=0A>>> I want=
to force OSPF to advertise 172.16/16 range without checking=0A>>> anything=
.=0A>>> And as you see I have an static route for it in routing table but a=
gain=0A>>> OSPF do not advertise it, only it advertise when I put one /32 s=
ubnet on=0A>>> loopback interface.=0A>>> even I put "redistribute static su=
bnets" command with/without route-map=0A>>> but=0A>>> again do not work.=0A=
>>> I think because of having my providers address range in my static route=
s,=0A>>> routers and ospf confused when wanna advertise routers.=0A>>>=0A>>=
>=0A>>> interface Tunnel0=0A>>>=0A>>>>=A0 ip address 128.140.40.2 255.255.2=
55.252=0A>>>>=A0 tunnel source 10.20.76.2=0A>>>>=A0 tunnel destination 10.2=
0.75.2=0A>>>> interface GigabitEthernet0/0=0A>>>>=A0 description UPSTREAM -=
INTRANET=0A>>>>=A0 ip address 10.20.76.2 255.255.255.248=0A>>>> interface =
GigabitEthernet0/1=0A>>>>=A0 description CONNECTED ROUTER=0A>>>>=A0 ip addr=
ess 10.20.76.9 255.255.255.248=0A>>>>=0A>>>> router ospf 10=0A>>>>=A0 log-a=
djacency-changes=0A>>>>=A0 area 10 range 172.16.0.0 255.255.0.0=0A>>>>=A0 p=
assive-interface default=0A>>>>=A0 no passive-interface Tunnel0=0A>>>>=A0 n=
etwork 172.16.0.0 0.0.255.255 area 10=0A>>>>=A0 network 128.140.40.0 0.0.0.=
3 area 0=0A>>>> ip route 0.0.0.0 0.0.0.0 10.20.76.1=0A>>>> ip route 172.16.=
0.0 255.255.224.0 10.20.76.12=0A>>>> ip route 10.20.76.0 255.255.255.0 10.2=
0.76.12=0A>>>> ip route 10.20.77.0 255.255.255.0 10.20.76.12=0A>>>>=0A>>>=
=0A>>>=0A>>>=0A>>> Thanks=0A>>>=0A>>> --=0A>>> Regards,=0A>>> Shahab Vahabz=
adeh, Network Engineer and System Administrator=0A>>>=0A>>> Cell Phone: +1 =
(415) 871 0742=0A>>> PGP Key Fingerprint =3D 8E34 B335 D702 0CA7 5A81=A0 C2=
EE 76A2 46C2 5367 BF90=0A>>>=0A>>>=0A>> ------------------------------**---=
---------------------------**----------=0A>>=A0 Jon Lewis, MCP :)=A0 =A0 =
=A0 =A0 =A0=A0=A0|=A0 I route=0A>>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 |=A0 therefore you are=0A>> _________ http://www.lewis.=
org/~jlewis/**pgp<http://www.lewis.org/~jlewis/pgp>for PGP public key______=
___=0A>>=0A>=0A>=0A>=0A>-- =0A>Regards,=0A>Shahab Vahabzadeh, Network Engin=
eer and System Administrator=0A>=0A>Cell Phone: +1 (415) 871 0742=0A>PGP Ke=
y Fingerprint =3D 8E34 B335 D702 0CA7 5A81=A0 C2EE 76A2 46C2 5367 BF90=0A>=
=0A>=0A>
