Multicast to unicast throught a Cisco 2921 router

[yoannquere]

hi,

we recently acquire a cisco 2921/K9 router  to interface 2 networks

Network 1 : 169.254.XXX.XXX/16 on GigabitEthernet0/0 interface

Network 2 : 192.168.1.XXX/24 on GigabitEthernet0/1 interface

on the network 1 side there is a multicast source (169.254.200.200 destination : 225.0.0.1)

on the network 2 side there is 1 receiver which is not multicast capable(old) but i want it to receive the multicast stream

for the moment we configure the ip multicast-routing and each interface each interface with ip pim sparse-dense-mode then configure the

GigabitEthernet0/1 in order to join the multicast group (using ip igmp static-group 225.0.0.1) and wireshark confirm that the multicast stream on the network 2 side from 169.254.200.200 -> 225.0.0.1

of course the receiver don't the stream, but if i force a "multicast to unicast" process inside the router it shall be ok....

after many hour of internet browsing i found 2 solution :

- NAT, http://netsyshax.wordpress.com/2010/08/23/multicast-to-unicast-and-vice-versa/

- multicast service reflection (Cisco documentation)

the NAT example don't work ,what is the best way to do this task (example if possible

best reagards

[Harold Ritter]

Hi Yoann,

It is quite possible to convert a multicast stream to unicast using the Multicast Service Reflection as described in the following document:

http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_serv_reflect.html#wp1056104

Hope this helps

[yoannquere]

hi,

according the Multicast service reflection example (multicast to unicast) i adapt (parmater in bold)  to my architecture and the multicast destination address (see attached drawing)  and i will try the following configuration next Friday,

• question1 , is it correct ? i
• question2, is the loopback and vif1 ip interface configuration is important ?
• question3, do i need to configure an "ip igmp static-group 225.0.0.4" on an interface (Vif loopback or physical) ?

best regards

configure terminal

ip multicast-routing

interface GigabitEthernet0/0

ip address 169.254.200.1 255.255.0.0

ip pim sparse-mode

no shutdown

interface GigabitEthernet0/1

ip address 192.168.1.1 255.255.255.0

ip pim sparse-mode

no shutdown

!

! Configure the loopback interface for the Service Provider RP

!

interface loopback 0

ip address 192.168.2.1 255.255.255.255

ip pim sparse-mode

!

ip pim rp-address 192.168.2.1 mylist override

ip access-list standard mylist permit 225.0.0.4 0.0.0.255

!

! Configure the Vif1 virtual interface for multicast service reflection

!

interface Vif1

ip address 10.1.1.1 255.255.255.0

ip pim sparse-mode

ip service reflect Ethernet 0/0 destination 225.0.0.0  to 192.168.1.0 mask-len 24 source 10.1.1.2

end

[Harold Ritter · Accepted solution]

Hi Yoann,

You are almost there.

You need to add the following command on the VIF interface. This is required to attract the multicast stream towards the Vif Interface.

Interface Vif 1

ip igmp static-group

You also need to change the interface on the "ip service reflect" command to specify the input interface.

Interface Vif 1

ip service reflect GigabitEthernet 0/0 destination 225.0.0.0 to 192.168.1.0 mask-len 24 source 10.1.1.2

Hope this helps

[yoannquere]

Thanks a lot !

i'll try this next friday and share my tests results for information

best regards

[yoannquere]

Ok , it's works !!!

i've only add an command "no shutdown" in vif1 interface (down by default)

tanks a lot !

[shujanaqvi]

Hi Fellas

Can I implement this setup on gns3 dynamips, and how can I test that MRS is working.

[shujanaqvi]

Hi Fella

Please can you let me know if we can test this configuration in gns3...and How did you test it in the real environment. I suppose vlc player?

[Steven Clinton]

I'm not sure of your exact limitations with you router being capable of multicast, but if it is the result of a nbma topology, you may want to look into pim nbma mode, it requires sparse mode on the connection between the routers.

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