Grab your Network Detective badge!  It’s time for another Network Detective ride-along.  🙂   Multicast this time.

Case of the Missing Multicast Streams

We need to solve the case of the missing Multicast streams.  ONLY 2 multicast streams (232.2.1.1 and 239.2.1.1) are getting thru to the hosts who requested them. The other 4 streams the same hosts requested are NOT getting thru.  Let’s go to the crime scene and review the facts.

• Fact #1 – Host off of Cat9K-40 is sending IGMPv2 membership reports to join ASM groups 239.1.1.1, 239.2.1.1 and 239.129.1.1
• Fact #2 – Host off of Cat9K-50 is sending IGMPv3 membership reports to join SSM groups 232.1.1.1, 232.2.1.1 and 232.129.1.1
• Fact #3 – All multicast sources are off of Cat9k-10 in subnet 10.1.2.0/24. They are sending the mcast for all 3 SSM groups and all 3 ASM groups
• Fact #4 – Cat9K-20 is the Rendezvous Point (RP) for all 3 ASM groups

Any thoughts at first glance?  Time to go to the YouTube ride-along ~11 minute video!  Good luck!  Have fun!

• Start of Video – 2:30: The Facts and the Symptom
• 2:31-4:40: Overview of How I Plan on Troubleshooting This PLUS What I will Find
• 4:41 til End: Off to the CLI and playing Network Detective. 🙂

Newer to Troubleshooting Multicast?  11 minute vBrownBag video below covers the highlights of Troubleshooting Multicast/