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Multicast debugging

shravanc
Level 1
Level 1

Hi, I am new to the multicast routing topics, but currently, I have the below setup:

Setup (components of the network):

R1(Router R1) on one side of the AWS VPC and R2(Router R2) on the other side of the VPC, Each router has one host (Ubuntu Server) behind it.

Configuration on the Routers:

  • Both the routers are connected via GRE Tunnel and it is working fine. 
  • Able to ping the ubuntu server on either side over the GRE tunnel
  • Pim-Dense mode is enabled on all the interface and "show ip mroute" and "sh ip pim ne" looks fine as well

Now that the GRE tunnel and the Dense Mode are working, I need help generating the multicast ping from one host to another. On the Ubuntu server I am unable to ping the multicast group IP (239.3.3.3) Please could you help me test this also do I need to add the IP 239.3.3.3 in the IP route table as well apart from the mroute table ?

Also, I have a python script that I have used to test the multicast traffic, I am sending the multicast packets from the python script, but unable to debug that on the router. Please could help me debug the traffic coming from the host?

 

1 Reply 1

shravanc
Level 1
Level 1

I think I figured it out. I think I have enabled pim dense-mode on the unnecessary interfaces. Able to get it working and enabled IPSEC on the GRE tunnel interfaces. 

Listing down the Commands that helped me figure out the issue:

mtrace SOURCE DESTINATION MULTICAST_GROUP_IP

show ip rpf DESTINATION_IP

sh ip mr count

sh ip mr

show ip traffic interface tunnel 0 

IPSEC Verification Commands:

sh crypto ipsec sa

sh crypto isakmp sa

show crypto isakmp peer

show crypto session detail