From: mani poopal (mani_ccie@yahoo.com)
Date: Wed Oct 06 2004 - 21:19:00 GMT-3
Brian,
Thanks for prompt response. I will try this
Mani
Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
Mani,
Yes, that is exactly what I was referring to. See the following
output:
R1#show ip ospf int lo0 | in Area
Internet Address 10.1.1.1/24, Area 0
R1#show ip ospf int tun0 | in Area
Internet Address 0.0.0.0/0, Area 0
R1#show ip ospf int e0/0 | in Area
Internet Address 15.1.1.1/8, Area 1
R1#show ip ospf nei
Neighbor ID Pri State Dead Time Address
Interface
10.2.2.2 0 FULL/ - 00:00:34 10.2.2.2
Tunnel0
10.2.2.2 1 FULL/BDR 00:00:33 15.1.1.2
Ethernet0/0
R2#show ip ospf nei
Neighbor ID Pri State Dead Time Address
Interface
10.1.1.1 0 FULL/ - 00:00:38 10.1.1.1
Tunnel0
10.1.1.1 1 FULL/DR 00:00:38 15.1.1.1
Ethernet0/0
3.3.3.3 0 FULL/ - 00:00:34 23.0.0.3
Serial0/1
R3#show ip ospf nei
Neighbor ID Pri State Dead Time Address
Interface
10.2.2.2 0 FULL/ - 00:00:35 23.0.0.2
Serial1/3
R1#sh ip route ospf
O IA 23.0.0.0/8 [110/11175] via 10.2.2.2, 00:00:33, Tunnel0
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O 10.2.2.2/32 [110/11112] via 10.2.2.2, 00:03:22, Tunnel0
O IA 10.3.3.3/32 [110/11176] via 10.2.2.2, 00:00:23, Tunnel0
R2#sh ip route ospf
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O 10.3.3.3/32 [110/65] via 23.0.0.3, 00:00:19, Serial0/1
O 10.1.1.1/32 [110/11112] via 10.1.1.1, 00:00:29, Tunnel0
R3#show ip route ospf
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
O IA 10.2.2.2/32 [110/782] via 23.0.0.2, 00:00:20, Serial1/3
O IA 10.1.1.1/32 [110/11893] via 23.0.0.2, 00:00:20, Serial1/3
O IA 15.0.0.0/8 [110/791] via 23.0.0.2, 00:00:20, Serial1/3
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> mani poopal
> Sent: Wednesday, October 06, 2004 6:36 PM
> To: Brian McGahan
> Cc: ccielab@groupstudy.com
> Subject: RE: ospf virtual-links vs GRE
>
> Brian,
>
> If R1 connect to area 0 & 1. R2 connect to area 1& 2. How can I make
an
> unnumbered interface (R2's lo 0 to participate in area 0). Is the
> following config should be ok on R2(note I am advertiseing lo 0 of R2
in
> area 0 eventhough R2 is not connected to area 0.)
>
> Example:
>
> ----------area 0---R1(15.1.1.1)------Area
1--------(15.1.1.2)R2-----Area
> 2------R3
> R1 lo 0=10.1.1.1/24
> R2 lo 0=10.2.2.2/24
> R2 lo 0=10.3.3.3/24
>
> R1 Config:
> router ospf 1
> network 15.1.1.1 0.0.0.0 area 1
> network 10.1.1.1 0.0.0.0 area 0
>
> int tunnel 0
> ip unnumbered lo 0
> tunnel source 15.1.1.1
> tunnel destination 15.1.1.2
>
>
> R2 Config:
> router ospf 1
> network 15.1.1.2 0.0.0.0 area 1
> network 10.2.2.2 0.0.0.0 area 0<------Since I am using unnumbered lo 0
is
> it area 0 or 2
>
> int tunnel 0
> ip unnumbered lo 0
> tunnel source 15.1.1.2
> tunnel destination 15.1.1.1
>
> PS:Brian in R2 the loopback is advertised as area 0 or area1. With
the
> above config, will I will be able to see R3's routes(lo 0) in R1. I
> haven't tested yet. Thanks for taking your time.
>
> Mani
>
>
>
>
> Brian McGahan wrote:
> Mani,
>
> As long as the tunnel sources and destinations are reachable by
> both endpoints of the tunnel, the ip address used on the tunnel itself
> is arbitrary, as long as it participates in area 0. Also, you don't
> necessarily even have to give the tunnel it's own address. You could
> unnumber it to another interface that is already participating in OSPF
> area 0.
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987 x 705
> Outside US: 775-826-4344 x 705
> 24/7 Support: http://forum.internetworkexpert.com
> Live Chat: http://www.internetworkexpert.com/chat/
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > mani poopal
> > Sent: Wednesday, October 06, 2004 1:32 PM
> > To: James
> > Cc: ccielab@groupstudy.com
> > Subject: Re: ospf virtual-links vs GRE
> >
> > Hi James,
> >
> > Thanks for the info. From where we are getting ip address for the
> tunnel
> > interface(10.1.10.1). Then we are advertising this network in the
> routing
> > domain and this route is propaged to the rest of the network. Is it
> ok to
> > come up with an ip address for tunnel interface. Because we
shouldn't
> > learn about the tunnel interface itself from the routing
> protocol(ospf),
> > do we have to advertise it in a different routing protocol, say rip.
> I am
> > looking through cisco website and could not get good config example
> for
> > gre/tunnel interface for ospf/rip/eigrp configuration. Any
suggestion
> > which books or url is better for this subject. By the way I tried
the
> > command you gave me and is not working, from both ABR's I created a
> tunnel
> > interface and advertised both tunnel interface in area 0.
> >
> > thanks
> >
> > Mani
> >
> > James wrote:
> > On Wed, Oct 06, 2004 at 06:36:37AM -0700, mani poopal wrote:
> > > Hi Group,
> > >
> > > In the exam if an ospf area is not connected to area 0, you can
use
> > virtual link to have the connectivity. It the requirement says not
to
> use
> > virtual link, I know you can achieve the desired result by GRE
tunnel.
> Can
> > any one point me to sampe url for configuration in the cisco website
> or
> > post a sample config.
> >
> > Router A:
> > in tun0
> > tun so a.a.a.a
> > tun des b.b.b.b
> > ip add 10.1.10.1 255.255.255.252
> > no shut
> > !
> > router osp 100
> > net 10.1.10.0 0.0.0.3 ar 0
> > !
> >
> > Router B:
> > in tun0
> > tun so b.b.b.b
> > tun des a.a.a.a
> > ip add 10.1.10.2 255.255.255.252
> > no shut
> > !
> > router osp 100
> > net 10.1.10.0 0.0.0.3 ar 0
> > !
> >
> > HTH,
> > -J
> >
> >
> > --
> > James Jun TowardEX Technologies, Inc.
> > Technical Lead Network Design, Consulting, IT Outsourcing
> > james@towardex.com Boston-based Colocation & Bandwidth Services
> > cell: 1(978)-394-2867 web: http://www.towardex.com , noc:
www.twdx.net
> >
> >
>
This archive was generated by hypermail 2.1.4 : Sat Nov 06 2004 - 17:11:44 GMT-3