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is it possible to create two multicast DR on the same subnet?

on server vlan 10.24.254.0/24, there are two routers:

R1 is .2 and R2 is .3 with "IP pim sparse-mode" enabled.

R1 and R2 are on two distinct Mcast domains

R1 has

ip pim rp-address 10.25.249.1 acl-one override

R2 has

ip pim rp-address 192.168.2.1 acl-two override

The problem is R2 with higher IP address is now the IGMP and PIM DR. Any multicast app with RP 10.25.249.1 is NOT working because R1 can't receive IGMP join from servers.

In addition, R1 by design can not reach 192.168.2.1 and same for R2 to reach 10.25.249.1

Thus configuring two "IP PIM rp-address" is not possible

how can I make R1 the DR for group IP under acl-one and R2 for group IP acl-two?

or I have to change network topology?

1 REPLY
Silver

Re: is it possible to create two multicast DR on the same subnet

There can be only one DR on a the same subnet.If there are more than one DR on the same subnet it would endup sending duplicate multicast traffic for connected host.For more information refer the URL

http://www.cisco.com/en/US/products/ps5763/products_configuration_guide_chapter09186a0080312878.html#wp1091449

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