Re: Multicast

Mohammad,
It's really hard to give you an answer without knowing the details of what's
exactly happening in the network and the full topology.

Here is where you should start:

Start off by statically putting the RP on each router with the override option
as we don't want to involve BSR or Auto-RP at this stage. Also have every
router ping the RP.

Now verify PIM between all routers.
 - show ip pim interface
 - show ip pim neighbor

You need to make sure that the PIM neighbor relationships are formed and that
they are not any unkonwn routers participating in PIM other than the ones you
intend (great TS problem). Ideally you set the PIM DR (ip pim dr-priority) in
the upstream path towards the RP as "sometimes" when testing you get issues
when it's not.

Next verify that all of the routers are agreeing upon the RP since you are
doing ASM.
 - show ip pim rp mapping

All of the routers should agree on the Group-to-RP mappings since we
configured the RP statically. If you didnt do this and they do not agree
upon the RP you will have to either change it so that they are in sync with
each other in regards to the Group-to-RP mappings or implement a workaround
(I.e. MSDP, SSM, etc).

Now verify we won't have any RPF failures and learn the direction the "trees"
will be setup by issuing the following commands on each router. (Note we
could use mtrace also to help detect potential RPF problems)
 - show ip rpf <RP IP Address>
 - show ip rpf <ping source>

Now verify that the *,G "tree" has been built along the path of the RPT
between SW1 and the RP from the "ip igmp join-group" command on SW1. ( Note:
No router should have a "Null" OIL or IIL entry except the RP)
 - show ip mroute <group>

Now it's time to test. Also let me know the output of the above commands
plus the output of "show ip route" if everything seems okay but your pings are
still failing.

--
Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
bdennis_at_ine.com<mailto:bdennis_at_ine.com>
INE, Inc.
http://www.INE.com<http://www.ine.com/>
From: Mohammad Mousa <mohd-mousa_at_hotmail.com<mailto:mohd-mousa_at_hotmail.com>>
Date: Sunday, September 30, 2012 4:27 PM
To: Brian Dennis <bdennis_at_ine.com<mailto:bdennis_at_ine.com>>,
"ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>"
<ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>>
Subject: RE: Multicast
Hello Brian,
I labed it today, as you said the only extneded ping can source from specific
IP address but still didn't catch the problem,  I tried debug ip mpacket
detail, show ip mroute count to see the RPF
failure, mtrace form the source to desintaion and vice versa. below my toplogy
:
I noticed another strange thing, When I pinged from R6's f0/0, I got reply
only from vlan 29 interface of SW1 for two packets only and then stopped !! I
tried SPT-threshold infinity command on SW1 also.
Every device in the topology learned the RP information correctly, I checked
the multicast routing table for OIL and IIL, everthings were fine.
f0/0 source
---------------R6--------R4 (candidate RP with higher priority(BACKUP RP))
                  |
                 |
                  |
                  R1 RP (I used BSR, R1 is the mapping agent and candidate-RP
as well)
                   |
                   |
                   SW3
                    |
                    |vlan 29 between four switches
                     |
  ------------- SW1
  igmp join here
   on this SVI 77
Sorry for this long question, I spent four hours to troubleshoot  without any
luck, any further help will highly appreciated !! :'(
Thank you very much .
________________________________
From: mohd-mousa_at_hotmail.com<mailto:mohd-mousa_at_hotmail.com>
To: bdennis_at_ine.com<mailto:bdennis_at_ine.com>;
ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>
Subject: RE: Multicast
Date: Tue, 25 Sep 2012 20:43:49 +0000
Hello Brian,
I used regular ping without specifynig anything like ping 239.x.x.x, also when
I used ping 239.x.x.x source from where the question should (f0/0) it was
working fine, but when I uesed the
extended ping command, I specified the interface f0/0 and the ip address of
it.
Thanks alot for your concern :)
> From: bdennis_at_ine.com<mailto:bdennis_at_ine.com>
> To: mohd-mousa_at_hotmail.com<mailto:mohd-mousa_at_hotmail.com>;
petesccie_at_gmail.com<mailto:petesccie_at_gmail.com>;
ccielab_at_groupstudy.com<mailto:ccielab_at_groupstudy.com>
> Date: Tue, 25 Sep 2012 14:49:52 -0500
> Subject: Re: Multicast
>
> Have you checked to see what source IP address that the extended ping is
> using and done a RPF check against it? When you do a standard ping to
> multicast address the source interface is all interfaces whereas with the
> extended ping you can specify the source interface. Also you might try to
> mtrace from the client to the source.
>
> --
> Brian Dennis, CCIEx5 #2210 (R&S/ISP-Dial/Security/SP/Voice)
> bdennis_at_ine.com<mailto:bdennis_at_ine.com>
>
> INE, Inc.
> http://www.INE.com <http://www.ine.com/>
>
>
>
>
>
>
> On 9/25/12 9:10 AM, "Mohammad Mousa"
<mohd-mousa_at_hotmail.com<mailto:mohd-mousa_at_hotmail.com>> wrote:
>
> >Hi Peter,
> >
> >I was working on real gear, My case was really strange because the normal
> >ping worked over and over but the extended ping worked and got response
> >for two reply only. I thought this because the last hop router, when it
> >changed from shared tree to source tree. I tried to put ip pim spt
> >infinity !! but it wasn't work and no reply I got.
> >Brian explained it at INE video, but seem I don't understand it well. :'(
> >
> >Any idea?Btw thank you for your answer.
> >
> > > S ubject: Re: Multicast
> >> From: petesccie_at_gmail.com<mailto:petesccie_at_gmail.com>
> >> Date: Tue, 25 Sep 2012 16:49:41 +0100
> >> To: mohd-mousa_at_hotmail.com<mailto:mohd-mousa_at_hotmail.com>
> >>
> >> Is this on real kit or gns3? I've seen strange issues with gns3 and
> >>multicast in the past. If gns3 - restart the lab kit and do your
> >>extended ping first and see what results you get..
> >> I've seen multicast work fine in gns3, but then stop working after a
> >>few mins testing & sending some large repeated multicast pings etc.
> >>
> >> Rgds,
> >> Peter
> >>
> >> Sent from my iPhone
> >>
> >> On 25 Sep 2012, at 04:32 p.m., Mohammad Mousa
<mohd-mousa_at_hotmail.com<mailto:mohd-mousa_at_hotmail.com>>
> >>wrote:
> >>
> >> > Hi folks, I have strange issue, I confiugred multicast network and
> >>eveything is working fi ne. When I used regular ping 239.x.x.x repeat 300
> >>source X I got full response. but when I used the extnded pingcommand I
> >>got only two responses and no reachibility after that. Any advices,
> >>any guidance before posting the diagram,Thanks in advance !
> >>
> >> >
> >> >
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> >> >
> >> >
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