1. Run the display interface interface-type interface-number command in any view or the display this interface command in the interface view to check the number of outgoing packets on the interface connecting to user terminals. The command output shows that a large number of packets are discarded, and the number keeps growing.
2. Mirror incoming packets on the interface connecting to the multicast server. Use Wireshark to parse the traffic, and determine whether packet loss occurs on the switch.
If there is only a small amount of burst traffic, increase the link bandwidth between network devices.
The burst traffic rate may reach 1 Gbit/s. As shown in Figure 4-7, the multicast server hibernates for more than a second, sends video at an approximate rate of 1 Gbit/s, and enters the hibernation state several milliseconds later. Although the average outgoing traffic rate is about 10 Mbit/s, the traffic rate approximates to 1 Gbit/s if measured in milliseconds.
Figure 4-7 Video traffic burst on the multicast server
In this case, change the mode in which the multicast server sends packets, so that packets can be sent at more stable rates, with little traffic burst, as shown in Figure 4-8.
For V200R001 and later versions, you can also run the qos burst-mode enhanced command on the related interface to increase the interface buffer size, so that more burst traffic can be buffered. Then ensure that packets are sent in a stable manner, with little traffic burst, as shown in Figure 4-8.
Figure 4-8 Traffic information after traffic burst is resolved