I have a video streaming multicast server witch performs rather poorly in a LAN environment. I used IGMP snooping for multicast and that part works just fine. However some of the clients are experiencing unacceptable latency and jitter (the video app freezes).
I tried to apply some layer 2 QoS as follows:
1. on the acces port to which the server is connected I used an input service policy which sets CoS to 6 and DSCP to 48;
2. on the trunk ports between the switches - mls qos trust cos;
Then, I started a live capture of traffic from one on the clients which showed that all packets/frames came with default CoS and DSCP of 0 - therefore no QoS in place.
I use Catalyst 4500, 3550 and 2950 series switches in my network.
BTW: Multicast replication can tax the performance capabilities of switches. Also, multicast, from lack of customer usage, hasn't always "wrung out" firmware issues quite the same way unicast does. Unknown whether either is a possible issue in this case, but at least with the latter, firmware current?
Well, I don't have the latest IOS on the 3550-12T, I only have version 12.1(22)EA1a.
I searched issues related to mcast with Cisco Bug Tool and didn't find too much.
I will upgrade the IOS though and see what happens...
Now that I think about it, there might be something to this - I've also discovered that although IGMP snooping IS running properly, the interfaces attached to the server and clients report 0 multicasts packets received and a huge and ever increasing number of broadcasts.
The funny thing is that I've extended the solution to mcast routing (PIM) and that part works fine - so basically clients several hops away have no problems while some clients on the same LAN with the server have performance issues.
We are pleased to announce availability of Beta software for 16.6.3.
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Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
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