RE: Testing Multicast over GNS3/Dynamips

Hi Muzammil,

Thanks a lot for the explanation. Yeah, I got it all wrong way around. Now,
it's all come into picture J.

Thanks again.

Best Regards,

Wendry

From: Muzammil Malick [mailto:malickmuz_at_gmail.com]
Sent: Sunday, June 06, 2010 11:12 PM
To: wendry
Subject: Re: Testing Multicast over GNS3/Dynamips

Wendry

You have this the wrong way round.

When you use ip igmp join command you are imitating a multicast receiver who
has now indicated they want to receive a particular multicast group stream.

When Marko explained that you can use ping, what he meant was that you can
imitate a multicast source by pinging the group.

Remember a Multicast source sends traffic to a destination address of the
group. A multicast receiver on the other hand listens to traffic being sent
to the destination group address.

E.g

R1 (Multicast Source)

Interface loopback 0

ip address 172.16.0.1 255.255.255.255

ip pim dense-mode

R6 (Multicast Receiver)

interface fast1/0

ip address 192.168.0.1 255.255.255.0

ip igmp join-group 239.0.0.1

R1#ping 239.0.0.1 source loopback 0

By pinging the group you are sending traffic to destination of 239.0.0.1 and
R6 is now listening for that traffic.

This is just an example to show the role of the source and receiver however
there may be any number of hops between R1 and R6

HTH

On 6 June 2010 14:37, wendry <wendry.misc_at_gmail.com> wrote:

Hi Marko,

Ok.. so I tried to ping and it replies. Using ip pim sparse-dense-mode, I
suppose ip igmp join command is like declaring a source of multicast for
which the interface does registration to the RP, and then when we do ping
from other router, the tree is built-up (comparable to when a host in a lan
send igmp membership report for a specific multicat group address). Is this
correct?
Thanks a lot.

Best Regards,
Wendry

-----Original Message-----
From: Marko Milivojevic [mailto:markom_at_ipexpert.com]
Sent: Sunday, June 06, 2010 8:17 PM
To: wendry
Cc: ccielab_at_groupstudy.com
Subject: Re: Testing Multicast over GNS3/Dynamips

You can always use ping as a traffic generator. On one router you can
join the group and you can ping that group from another router. If you
get responses, it's likely that your multicast works... :-)

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
YES! We include 400 hours of REAL rack
time with our Blended Learning Solution!
Mailto: markom_at_ipexpert.com
Telephone: +1.810.326.1444
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On Sun, Jun 6, 2010 at 12:10, wendry <wendry.misc_at_gmail.com> wrote:
> Hi all,
>
>
>
> Can you enlighten me how to test out our multicast configuration over
> Dynamips?
>
> I have created a multicast environment routers and configure the routers
to
> perform multicast traffic forwarding. Now, how do I verify if it works
> correctly?
>
> I have tried to use command ip igmp join-group x.x.x.x over an interface.
> Looks like the tree has built itself. But for each interface that I add
the
> configuration looks like the command cause the interface to all become the
> source of multicast group. How do I simulate like source and client
> scenario?
>
> Sorry, if I may not be too clear as I am still trying to enhance my
> knowledge on this topic. Any light to correct my knowledge is much
> appreciated.
>
> Thank You.
>
>
>
> Best Regards,
>
> Wendry
>
>
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