From: Ahsan Mohiuddin (ahsan.mohiuddin@gmail.com)
Date: Sat Apr 26 2008 - 12:50:10 ART
Hello again,
I formed a tunnel between spokes and it works fine when i put ip addressing
over the tunnel. THat is, I am able to ping mcast addr 228.22.22.22 from R4.
R2 sees this as a source for this group out the tunnel interface.
However, once i use unnumbered on the tunnel, R4 cannot send ping packets
out the tunnel interface. So, well we are back to square 1; R4 sends packets
out to to R5 over FR. Since we are running dense mode, ip pim nbma-mode is
useless and R5 will not forward out the same interface on which it received
the packets.
Any ideas how to make R2 receive ping packets from R4 over the unnumbered
tunnel?
Thanks
On Sat, Apr 26, 2008 at 2:08 PM, Ahsan Mohiuddin <ahsan.mohiuddin@gmail.com>
wrote:
> much thanks.. i wonder why unnumbered never crossed my mind!
>
>
> On Sat, Apr 26, 2008 at 1:55 AM, Rich Collins <nilsi2002@gmail.com> wrote:
>
> > yes. Probably you are allowed "ip unnumbered addresses for the GRE
> > tunnel". You have to then be careful about active routing protocols which
> > will broadcast/multicast over this tunnel. You might need to declare the
> > tunnel interface as passive.
> >
> > You also most likely will need a static mroute.
> > Watch for any RFP failures.
> >
> > i.e.
> > *Mar 1 00:31:41.631: IP(0): s=192.168.5.5 (Tunnel1) d=228.22.22.22id=30, ttl=253, prot=1, len=100(100), not RPF interface
> >
> > -Rich
> >
> > On 4/25/08, Ahsan Mohiuddin <ahsan.mohiuddin@gmail.com> wrote:
> > >
> > > like GRE tunnel? I don't know bcuz the lab instructions specifically
> > > ask NOT to add any IP Addressing thats not there in the diagram
> > >
> > > On Fri, Apr 25, 2008 at 8:53 PM, Rich Collins <nilsi2002@gmail.com>
> > > wrote:
> > >
> > > > nbma mode on the hub will not help you with dense-mode since you
> > > > don't have an explicit join.
> > > >
> > > > Maybe one option is to build a pim dense tunnel between the two
> > > > spokes?
> > > >
> > > > -Rich
> > > >
> > > >
> > > > On 4/25/08, Ahsan Mohiuddin <ahsan.mohiuddin@gmail.com> wrote:
> > > >
> > > > > Hello Group,
> > > > >
> > > > > I have two FR spokes R2 and R4 connected out R5 (hub)'s multipoint
> > > > > sub-if
> > > > > s1/0.245. The network is running PIM sparse-dense. R2 is a client
> > > > > for group
> > > > > 228.22.22.22. There is no RP for it, hence its a dense-mode group.
> > > > > All PIM
> > > > > routers receive ping replies from the 228.22.22.22 client (R2),
> > > > > except the
> > > > > other FR spoke R4. I have already checked for RPF failure but
> > > > > can't see any.
> > > > > On R5, I can see interface s1/0.245 as being in the (S,G) entry's
> > > > > Incoming
> > > > > interface list but not in the Outgoing list. I have already added
> > > > > ip pim
> > > > > nbma-mode under this sub-if, but R4 is unable to ping the group.
> > > > > ANy
> > > > > comments are appreciated. P.S. nothing but physical interfaces is
> > > > > allowed on
> > > > > both R4 & R2 (FR spokes).
> > > > >
> > > > > thanks in adv for your inputs
> > > > >
> > > > >
> > > > >
> > > > > Pass the CCIE in six weeks, Guaranteed!
> > > > > http://www.certscience.com/CCIE
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> > > > > _______________________________________________________________________
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