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Basic multicast routing configuration

Posted on 2013-12-10
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Last Modified: 2013-12-25
Hi,

How to configure multicast routing for sending multicast packets from one vlan to
other vlan group

scenario :


cisco 3560 switch
   /               \
VLAN10       VLAN20

Source multicast traffic is from VLAN10

destination multicast is to VLAN 20 (few systems)


what is basic configuration at switch to meet the requirement

Regards
Ramu
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Question by:RAMU CH
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unfragmented earned 2000 total points
ID: 39710444
Enable multicast at the global config level:-
ip multicast-routing
(Some platforms need ip multicast-routing distributed instead)

Enable multicast routing at the interface config level:-
int vlan 10
 ip pim sparse-mode
int vlan 20
 ip pim sparse-mode

If you need to route multicast across multiple devices its a little more complex and needs a bit more config.

To validate and test, the following commands are helpful.
show ip mroute
show ip igmp groups
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by:RAMU CH
ID: 39713229
Hi,

I have cofigured multicast ipaddress as 224.0.1.40 then it is working but
with 224.0.1.116 multicast ip address,it is not working

is there any difference in 224.0.1.40 ip address

Regards
Ramu
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Assisted Solution

by:unfragmented
unfragmented earned 2000 total points
ID: 39714035
For multicast to work properly, you need multicast aware applications.  For general application use, you should generally use an address from the 239.255.0.0/16 range, as these are defined in RFC's as being "administratively scoped".  

FYI, 224.0.1.40 is registered by Cisco as a well known mcast address for RP discovery.  224.0.1.116 is registered by Spectralink as a well known mcast address, i think for voice communications.
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by:RAMU CH
ID: 39739006
thanks
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