Marko, let's forget about ASA in between.
There are four routers connected back to back. There is a point to point
GRE running between R1 and R3. R1 is source of the multicast and R4 needs
the multicast feed.
PIM is enabled only of tunnel interface of R1
PIM is enabled on tunnel interface of R3
PIM is enabled on R3's G0/1
PIM is enabled on R4's G0/1
R1's Loopback interface 1.1.1.1 has been configured as PIM RP on R1,R3 and
R4.
Now I can either have a route for 1.1.1.1 on R3 through the GRE tunnel
interface or G0/0 going through R2. On R3, PIM is running across tunnel
interface and not G0/0.
Now please let me know, should I route 1.1.1.1 from R3 through R2 or the
tunnel interface. I am sure it should be through the tunnel as PIM is
running through the tunnel.
Do let me know, through what RP 1.1.1.1 should be routed and the reason
with elaboration with your routing expertize :-)
L0 R1G0/0 -------------------- G0/0 R2 G0/1 -----------------------G0/0 R3
G0/1 ---------------- G0/0 R4
|-------------GRE tunnel-----------|
With regards
Kings
On Tue, Mar 27, 2012 at 10:27 PM, Marko Milivojevic <[email protected]>wrote:
>
> To answer that, I would have to read the actual lab and then spend two
> months understanding what it says :-). I can offer my expertise on R&S part
> of it, not what ASA does with the traffic :-)
>
> --
> Marko Milivojevic - CCIE #18427 (SP R&S)
> Senior CCIE Instructor - IPexpert
>
> On Tue, Mar 27, 2012 at 01:04, Kingsley Charles <
> [email protected]> wrote:
>
>> Hi Marko,
>>
>> The Multicast Server is the ,which is behind the ASA.
>>
>> Even I feel it should be through the tunnel. But in IPexpert's Vol 2 lab
>> 17, the RP is being routed through the ASA and they have added a mroute
>> through the tunnel to overcome the RPF check. It worked, but how will the
>> IGMP messages reach the RP when it is being routed through the ASA?
>>
>>
>> With regards
>> Kings
>>
>>
>> On Tue, Mar 27, 2012 at 11:58 AM, Marko Milivojevic
>> <[email protected]>wrote:
>>
>>>
>>> What is the direction of the multicast traffic flow? I.e. where are
>>> clients and servers?
>>>
>>> To understand why I'm asking you thins, please go to our blog and read
>>> this series of articles. That will explain the traffic flow you need to
>>> support and will subsequently answer the question you have here:
>>>
>>> http://blog.ipexpert.com/2011/05/04/understanding-pim-register-process/
>>>
>>> http://blog.ipexpert.com/2011/05/09/pim-register-there-is-a-source-but-no-clients/
>>>
>>> http://blog.ipexpert.com/2011/06/30/pim-register-there-are-clients-but-no-source/
>>>
>>> The issue of not routing the RP address through the correct interface
>>> will most likely cause RPF failure. To read about that particular issue:
>>>
>>>
>>> http://blog.ipexpert.com/2010/12/13/multicast-reverse-path-forwarding-rpf/
>>>
>>> http://blog.ipexpert.com/2010/12/15/multicast-rpf-failure-recovery-using-igp-routing/
>>>
>>> http://blog.ipexpert.com/2010/12/27/multicast-rpf-failure-recovery-using-static-rpf/
>>> And if you're *really* adventurous:
>>> http://blog.ipexpert.com/2010/12/29/multicast-rpf-failure-recovery-using-bgp/
>>>
>>> Hope this helps.
>>>
>>> P.S. My gut feeling says "tunnel" :-)
>>>
>>> --
>>> Marko Milivojevic - CCIE #18427 (SP R&S)
>>> Senior CCIE Instructor - IPexpert
>>>
>>> On Sat, Mar 17, 2012 at 01:35, Kingsley Charles <
>>> [email protected]> wrote:
>>>
>>>> Hi all
>>>>
>>>> I have the following the topology. The ASA in multicontext mode is
>>>> sitting in between the KS and GM. I am using a GRE point to point tunnel
>>>> interface between R1 and R2.
>>>>
>>>> I am using pim sparse mode and the loopback of R1 is the PIM RP
>>>>
>>>> R1 (KS) L0 ------ ASA (multicontext) ------- R2 (GM)
>>>>
>>>> Ok, the R1's loopback address is routed through the ASA from R2.
>>>>
>>>> But the PIM tree is running across the tunnel.
>>>>
>>>> So should the R1's loopback address be routed through the tunnel or ASA?
>>>>
>>>> Or just adding the mroute for R1's loopback address through the tunnel
>>>> interface is suffice while the regular route is through ASA?
>>>>
>>>> With regards
>>>> Kings
>>>> _______________________________________________
>>>> For more information regarding industry leading CCIE Lab training,
>>>> please visit www.ipexpert.com
>>>>
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>>>> www.PlatinumPlacement.com
>>>>
>>>
>>>
>>
>
_______________________________________________
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