From: Ahsan Mohiuddin (ahsan.mohiuddin@gmail.com)
Date: Sat Apr 26 2008 - 14:44:40 ART
Hello,
i just came up with one more possibility. We could run eigrp 20 on R2 and
R4's loopback 0 and unnumbered tunnel interfaces. The eigrp routes (to
remote router's loopback) will be preferred over OSPF routes. Thereby, ping
to multicast group from R4 will cause the packets to take the tunnel rather
than the FR cloud. The question is, is it valid to add a routing domain,
which the lab does not ask you to create?
I have seen IE's solution guide for this lab but apparently it suggests
nothing to overcome this problem. I would be grateful if Brian D. or Brian
M. could shed some light.
Thanks
On Sat, Apr 26, 2008 at 8:50 PM, Ahsan Mohiuddin <ahsan.mohiuddin@gmail.com>
wrote:
> 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
> > > > > >
> > > > > > _______________________________________________________________________
> > > > > > Subscription information may be found at:
> > > > > > http://www.groupstudy.com/list/CCIELab.html
Pass the CCIE in six weeks, Guaranteed!
http://www.certscience.com/CCIE
This archive was generated by hypermail 2.1.4 : Thu May 01 2008 - 08:25:52 ART