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Webcast-Catalyst9k
New Member

Router Interface multicast only

Hello !

When you have a vlan with multicast senders, how to have a router interface on this vlan to forward the multicast trafic, and without unicast routing.

Before, with IP of senders in 10.1.23/0/24 , on a (old) 6500, this config works fine:

interface vlan 123

  ip address 192.168.123.1 255.255.255.0

  no ip proxy-arp
  ip pim sparse-mode
  ip cgmp

ip mroute 10.1.23.0 255.255.255.0 192.168.123.1

But,  now,  "ip mroute 10.1.23.0 255.255.255.0 192.168.123.1" is not permited (same router).

I will be happy to have the trick to do that again...

JM Tetu

5 REPLIES
VIP Purple

Router Interface multicast only

What do you mean by "ip mroute x.x.x.x x.x.x.x" is not permitted.

waht is show ip route 10.1.23.0 looks like ? What is the group address multicast traffic sending to ?

also  provide us "show ip  pim rp mapping"

Rasika

New Member

Router Interface multicast only

Thanks for your help !

I give a graph for better explain my problem.

The multicast trafic can not be routed like unicast (A Wifi Lan Controller stop it).

So, the "show ip route 10.1.23.0" give a route (and unicast works very well), but i cannot use it. I try to have an multicast only interface.

Now, i add temporary a cisco 1841 router. It's the RP give by "show ip  pim rp mapping".

It woks fine. But it's a patch-up job....

VSS#show ip pim rp mapping
PIM Group-to-RP Mappings

Acl: 8, Static
    RP: xxxx (?)
Acl: 9, Static
    RP: xxxx (?)
Acl: 7, Static
    RP: xxxxx (?)
Group(s): 224.0.0.0/4, Static
    RP: 192.168.123.2 (?)

On the multcast router:

interface fa 0/0

ip 10.1.23.253 255.255.255.0 secondary

ip 192.168.123.2 255.255.255.0

ip pim sparse-mode

==> As i have on the 1841 an IP in the same network than the multicast sender, it's forwarding the multicast. And as it's not the IP of gateway of the sender....

If i can find a solution to suppress the 1841, it will be very better.

VIP Purple

Router Interface multicast only

Thanks alot fo the diagram & additional detail. Diagram is really helped to understand your network better.

still i have few question prior to give your some recommendation

1. Is this Ghost client connect via wired or wirelessly ?

2. What is the WLC model & what version of software it is running (if it is a cisco WLC then you can enable multicast on that  & I can help if that is an option for you)

HTH

Rasika

New Member

Router Interface multicast only

The ghost client connect via wired.

The WLC is a Cisco 5508. The software Version is 7.2.111.3.

And multicast on wired guest lan with a cisco WLC is an option for me.

It will be very more simple!

VIP Purple

Re: Router Interface multicast only

Hi Jean,

I will test this (wired guest + multicast on WLC) & let you know. I think you may have a better solution that what you are doing today to get this working

HTH

Rasika

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