Subscribe to Multicast Groups

[Cisconew]

Hi all,

I have attached network topology for the Multicast routing. In this task, we have to subscribe Server 1 & 2 to Multicast A and Multicast B groups feeds.But Both server 1 and 2 are only receiving Multicast B feed only. I want to know why both servers are receiving only Multicast feed B and  not not from Multicast A . What could be the problem and how to solve this?

Note: Network topology is attached (with necessary tasks to do)

[Harold Ritter · Accepted solution]

Hi @Cisconew ,

Router D is the designated forwarder for

subnet 10.10.10.0/24

because it has a higher IP address than router C.

Router D will only forward the multicast feed B due to the multicast boundary ACL configured on interface

Vlan100

This is why both server 1 and 2 only receive the multicast feed B.

To fix it you could add feed A multicast address to the multicast boundary ACL on Router D. You could also add feed B multicast address to the multicast boundary ACL on Router C for redundancy purposes.

You would also need to run MSDP between Router A and Router B, so that Router B learns about the active multicast source from Router A and vice versa.

Regards,