Configuring Multicast

Hello,
I want to configure a multicast network but I'm confused about creating a multicast group.
I think that I have to assign a multicast address to a switch interface and then to connect a computer to this interface, isn't it?
In the attachment there is my network diagram, I hope it help you to understand the situation.
Thank you in advance! :-)

I looked at your running config. No multicast enabled there so I am assuming you typed these commands after?
Basically, your setup looks fairly simple and should work provided 2 conditions and you can clarify some stuff for me.
Where is the video server?
Let's say it's on fast 0/0.1
If it's set up to use multicast streaming, you are going to pick the address it's going to use right?
Once you do that and pick the stream, it should start playing...
In dense mode, the operation is as such.
When you start streaming, it will build s,g connections on all egress interfaces as it assumes that there are receivers on those interfaces.
Issue the show ip mroute command and you should see the multicast group showing up on the other interface that you have pim enabled on.
If not, then check to see that you are in fact set up for multicast streaming.
If so, then verify that the receivers are configured to "subscribe" to that channel you are broadcasting on.
Once you have that stuff squared away you should be all set..
You can send me screen shots of the vid server setup if you want and send me an updated
sh run
sh ip mroute
OK?
Chris

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              >>Hi,
              >>
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              >>and
              >>they are specified programatically when a socket is opened.
              >>
              >>--
              >>Dennis Munsie
              >>Developer Relations Engineer
              >>BEA Support
              >>
              >>"Dan" <[email protected]> wrote in message
              >>news:[email protected]...
              >>
              >>>Basic Cluster Query,
              >>>
              >>> Several weeks ago, I was thrashing about trying to verify the syntax
              >>>
              >>for
              >>setting
              >>
              >>>up a multicast address on Solaris 2.6 in preparation for implementing
              >>>
              >>Weblogic
              >>
              >>>6.0 clustering. The command syntax was:
              >>>
              >>> ifconfig {interface}:{virtual#} plumb
              >>> ifconfig {interface}:{virtual#} {multicast_address} up
              >>>
              >>>The commands succeeded on the first and second servers without errors,
              >>>
              >>but
              >>unbeknownst
              >>
              >>>to me there were errors reported on the second host concerning duplicate
              >>>
              >>address.
              >>
              >>> The errors were:
              >>>
              >>> unix: WARNING: IP: Hardware address '08:00:20:a6:ed:0a'
              >>> trying to be our address 237.000.000.008!
              >>>
              >>>The server halted today after several weeks; however, it is not clear
              >>>
              >>whether
              >>
              >>>the multicast address caused the halt. Neither Weblogic nor Sun
              >>>
              >>documentation
              >>
              >>>have been helpful. Can anyone provide guidance on setting up multicast
              >>>
              >>address
              >>
              >>>on Solaris 2.6?
              >>>
              >>>Bewildered,
              >>> Dan
              >>>
              >>
              >
              

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    at java.net.PlainDatagramSocketImpl.send(Native Method)
    at java.net.DatagramSocket.send(Unknown Source)
    at com.tangosol.net.MulticastTest.run(MulticastTest.java:295)
    ... 1 more
    2009-12-14 13:47:00.670/0.822 Oracle Coherence GE 3.5.2/463 <Error> (thread=main, member=n/a):
    Exiting MulticastTest
    Thanks,
    Prakash

    Thanks.
    I found out the issue. It because of IP Tables blocking off multicast packets.
    Once I stopped IP Tables everything worked fine. Looks like I will have to modify the rules.

  • Redundant Multicast switching

    All, I have a customer with a L2 network with multiple VLANS and consisting of multiple access switches with two L2/L3 core switches.  Both core switches have a SVI for each vlan using HSRP to provde redundant Default Gateways.
    The main core switch is a Cisco 6500 (running 12.2(33)SXJ6) and the backup core switch is a Cisco 4500.
    One of the applications on this network is Multicast which needs the protection of the redundant core switches (this is for a critical public infrastruction and so requires the protection, if one switch fails the other must continue to support the service).
    I initially tried configuing "IP PIM DENSE-MODE" on the VLAN interfaces (one of the solutions as per Cisco doc #68131 which discribes a problem and solutions for configuring multicast on a L2 network) to make the switch act as a "mrouter".  When I configure pim on the applicatable vlan's on one (the main core) switch the multicast application/s work properly but when I then configure pim on the applicatable vlan's on the other (backup) switch igmp-snooping seems to fail and all interfaces on the vlan get the multicast traffic whether they have joined the group or not (effectively causing a DOS attack on the interfaces that haven't joined the group).
    Another solution from document #66131 is to enable the igmp querier feature on the L2 switches (and I assume, remove the IP PIM configuration).  This should make the switch act as a mrouter "proxy".
    I have also read the chapter (chaper 38) in the IOS configuraiton guide on "Configuring IGMP Snooping" which has a section on configuring redundant igmp snooping queriers.  I am thinking of trying the configuration this section is suggesting where I would remove the IP PIM and, instead, configure "ip igmp snooping querier" on the appropriate vlan interfaces on both switches.  Unfortunately I do not have a lab to test this out on and so am currently limited to trying this out on the actual network (scary!).
    So, my questions.  First, and in general, does anyone have any words of wisdom for me?  Two, if my network only has mrouter "proxies" only but no actual mrouter (as I believe will be the case if I am only using the "querier" configurations) will that cause any problems with the multicast applications?
    I am under some immediate pressure to solve this redundancy issue so any help would be greatly appreciated.

    Steve
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    To be honest i didnt understand a lot of what you said about your physical connectivity other than each switch sees the other switches via trunk links.
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    Cna you just clarify what you mean by all interfaces ie. do you mean all end devices on all the switches start seeing multicast traffic ?
    When you enabled PIM on the 4500 did you enable it on all L3 interfaces at the same time ?
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    Jon

  • Multicast IGMP

    What command turns on IGMP on when configuring Multicast?

    For Nexus:
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    Statically bind a local multicast group
    Enable link-local group reports
    Source: http://www.cisco.com/en/US/docs/switches/datacenter/sw/nx-os/multicast/configuration/guide/b_multicast_chapter_011.html
    For Catalyst:
     By default, IGMP snooping is globally enabled on the switch. When globally enabled or disabled, it is also enabled or disabled in all existing VLAN interfaces. IGMP snooping is by default enabled on all VLANs, but can be enabled and disabled on a per-VLAN basis.
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    conf t
    ip igmp snooping !Globally enable IGMP snooping in all existing VLAN interfaces.
     end  
    Source: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_55_se/configuration/guide/swigmp.html

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