RTP Flow Monitor
I thought I made a post about this a while ago, but it turns out I never got back around to it :-). While I have a lot of issues with Cisco at the moment ....
Tag: multicast
IGMP Messages
Recently in troubleshooting an issue I saw some odd IGMP messages that I had never seen before. One of the record types was called "block-old-sources". From RFC 3376 It states BLOCK OLD SOURCES: Indicates that ....
show ip igmp event-history
During a late night troubleshooting session I came across this command on my Cisco Nexus switches. show ip igmp event-history debug may be a life saver when troubleshooting Multicast issues. I wish I had known ....
Adding Multicast to a Cisco NCS 540
We recently got some Cisco NCS 540's which we need to deploy. By default when they were shipped they didn't have multicast activated or even have the RPM installed. For those familiar with the ASR ....
Non Blocking Multicast
My current company has gone all in with Cisco on their IPFM (IP Fabric for Media) using a "Spine/Leaf" solution. I put Spine/Leaf in quotes because it definitely isn't traditional. We have a chassis acting ....
Troubleshooting 0 bit traffic
I just ran into an issue where I could see the multicast join was happening and the mroute seemed to be formed on my Nexus 7K, but we were receiving 0 bits of traffic. This ....
Credited Vs Uncredited Buffers
One of the biggest issues we ran into in 2017 was finding out that Multicast was buffered differently on the Cisco Nexus platform. This took a while to troubleshoot because you really have to know ....
Multicast on a 2K Fex
I just had an issue where I was attempting to do a packet capture on a 2K Fex that was attached to a Nexus 5K. Since you can't use the Fex port as a destination ....
Continuity Count Errors
Recently I had an issue where I would up troubleshooting multicast with a TON of CC errors. We were sending a 20 Mbps stream to a station, and they were only receiving 15 Mbps. They ....
IGMP V3 Mode 1 VS Mode 2
We had an ongoing issue recently with multicast receivers on our 4507 that would loose their multicast groups every so often and we couldn't explain why. It looked like the problem was the 4507. We ....