How is the image pause problem solved on an S series switch when there are many multicast users


On a multicast network, a large number of multicast users connect to Layer 2 multicast devices. IGMP snooping packet suppression is not configured on the Layer 2 multicast devices. If many users request multicast data, many IGMP Join messages are sent to the IGMP querier from Layer 2 multicast devices. The IGMP querier is burdened with IGMP Join messages and even drops some IGMP Join messages when the rate of traffic exceeds its processing capability. As a result, some multicast forwarding entries fail to be generated, so matching multicast data cannot be forwarded to receivers. The multicast users then experience image pauses in the video programs they are watching.

For an S series switch, this problem can be prevented by configuring IGMP snooping packet suppression on the Layer 2 multicast devices. After this function is configured, a Layer 2 multicast device forwards only one IGMP Report/Leave message for a group to the IGMP querier in the following scenarios: When the first member joins a multicast group or a host sends a Report message in response to an IGMP Query message, the Layer 2 device forwards a Report message to the IGMP querier. The IGMP querier then creates or maintains the matching forwarding entry based on the Report message. When the last member of a group leaves the group, the Layer 2 device forwards a Leave message to the IGMP querier. The IGMP querier then deletes the matching forwarding entry. This mechanism greatly reduces the number of packets sent to the IGMP querier, thereby reducing the load of the IGMP querier and ensuring quality of the video-on-demand service.

Other related questions:
Checking the restart reasons of an S series switch
the display reboot-info command to check restart reasons of S series switches (except S1700 switches). A switch may be restarted due to one of the following reasons: MANUAL: It is restarted by using the reboot command. POWER: It is restarted after being powered off. SCHEDU: It is restarted by using the schedule reboot command. OTHER: It is restarted due to either of the following reasons: 1. It is power recycled instantly, for example, the power cable is in bad contact or transient overvoltage and loss of voltage occurs. In this case, check whether the power cable is correctly connected to the switch. 2. An exception occurs in the system.

If SCHEDU or MANUAL is displayed in the command output, the switch is normally restarted. If POWER or OTHER is displayed, check whether any other devices using the same power supply system have reboot records around the time when the switch is restarted. If such reboot records are found, the switch's restart is caused by exceptions in the external power supply system. If no such reboot record is found, go to the next step . If the switch uses pluggable power modules, replace the power modules with power modules that can work normally to determine whether the power modules are faulty. If the switch uses built-in power modules, collect required information and contact Huawei technical support personnel if the external power supply system works properly. The information includes the outputs of the display version, display device, display reboot-info, display alarm urgent, and display power commands. (If pluggable power modules are used, the output of the display power command is not required.)

How to solve the problem that invalid IP addresses cannot be automatically cleared on S series switches
The time for reclaiming IP addresses on S series switches is configurable: - In global address pool mode, run the lease command in the IP address pool view. - In interface address pool mode, run the dhcp server lease command in the corresponding interface view.

S series switches problem with VLSM
S series switches (except S1700) support VLSM to divide subnet, support 31-bit mask

What should I do if the image in the large pane is segmented when the VP9000 series MCU enables the VIP4 mode?
Run the system-view video-sub-pic-mode 0 command to solve the problem.

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