Need help on multicast..

[Ken Lee]

Hi All,

Need expert advice on this multicast setup configuration. I have network diagram as attached. Intend to use sparse mode. So will have RP Configuration at Core Switch 6509.

But Can anyone let me know how to have the complete multicast traffic happens at all nodes? Do I need to do it at C7206 Routers which also need to be involved in the multicast and if yes,  is it the interface needs to be configured as IP PIM SPARSE MODE only? Or some other global configuration needed.

But it will be great if someone can help me know on each nodes what configurations needed to make this multicast traffic work from IPTV Server to feed to the user side !

Thanks in advance!

KA

[Giuseppe Larosa]

Hello Ken,

you need to enable ip multicast routing on all involved devices.

on all interfaces part of the topology you can choice:

you can use ip pim sparse-mode if:

you configure the RP address statically

or you use bootstrap protocol for dynamic RP to group mapping

or you use ip pim auto-rp listener + auto RP for

dynamic RP to group mapping

you need to use ip pim sparse-dense mode on interfaces if :

you use older autoRP feature for dynamic RP to group mapping without

ip pim auto-rp listener

see comfiguration guide

http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_basic_cfg_ps6441_TSD_Products_Configuration_Guide_Chapter.html

Hope to help

Giuseppe

[Ken Lee]

Giuseppe,

I am thinking of using RP address statically between Core Switch 1 and Core Switch 2. Do you think in a good design, the RP also needed to be on the C7206 Router 1 and 2?

Besides enable the ip multicast routing on all devices including C7206 routers, what other configuration I need to put in the C7206 Routers ?

I have the 2 multicast range as I have IPTV and Video Apps that have multicast range of 239.1.15.1 and 239.5.5.5.

Thanks again,

KA

[Giuseppe Larosa]

Hello Ken,

all multicast enabled routers must be able to perform group to RP mapping in a PIM sparse mode domain.

if you decide to use static RP you need to configure it on ALL routers.

without an RP a router should fall back to dense mode and this is not desirable if WAN links are part of the topology for the waste of bandwidth.

please take the time to read carefully the configuration guide link I have provided in my first post it should be public.

see also the first  chapter about the concepts.

http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_tech_oview_ps6441_TSD_Products_Configuration_Guide_Chapter.html

You need to grasp the basic concepts in order to be successful in this activity.

Hope to help

Giuseppe

[Jonathancert_2]

I am no expert on multicasting but it appear you may have to do layer 3 (SVI) multicasting.  I am doing multicast for GHOSTing purposes on my network between my Distro 6509's and Access 4510's.  First you have to enable "IP multicast-routing" and then apply"sparse-dense-mode" to the applicable interfaces.  There are a lot more additional commands that may or may not be needed depending on your infrastructure. Here's a link that should get you pointed in the right direction.

http://www.cisco.com/en/US/customer/docs/ios/12_2/ip/configuration/guide/1cfmulti.html#wp1000889

Jonathan,

[Ken Lee]

Jonathan,

Thanks. It has for CCO login which I don't have .

Would you willing to share how configuration being done at the Core and Access? Basically my design will be more on sparse mode only and is asked to configure RPs.

Rgds,

KA

[paolo bevilacqua]

To work with Cisco products, you need a cisco.com account more specifically you will need a paid support contract (smartnet) to access downloads and tools.

Trying to do without is unprofessional and does not "work".

[Jonathancert_2]

I am in agreement with Giuseppe on the setup.  With auto RP, i didn't have to set up any RP statically.  This is my configurations.  On the trunks of my C6509's:

(config)#ip multicast-routing

(config)#int vlan 100 !Layer 3 trunks between cores!

(config-if)#ip pim sparse-dense-mode

On my 4510s:

(config)#ip multicast-routing

(config)#int vlan 100 !Layer 3 trunks between cores!

(config-if)#ip pim sparse-dense-mode

(config)# ip igmp snooping

(config)#ip igmp snooping VLAN 34

(config)#int vlan 34 !Client VLANS!

(config-if)#ip pim sparse-dense-mode

Like I said, I am no expert on multicasting and each infrastructure is different but this setup works for mines.  I also had to configure "ip pim sparse-dense-mode" on my port-channel between my core 6509's.  I could e-mail you the PDF, but the one that Giuseppe provided is very similar to mine.

Jonathan,