Is the same interval for sending General Query messages required on S series switches


The interval for sending General Query messages is an important parameter used to calculate the aging time of multicast forwarding entries. When configuring this parameter on a multicast network, you are advised to configure the same value on all the devices. If multicast devices use different intervals, valid multicast forwarding entries may be aged out incorrectly, causing multicast traffic interruption.
Devices from different vendors use different default intervals. When a network has devices from different vendors, configure the same interval on these devices. The default interval on S series switches is as follows:
- IGMP: 60s on S series switches and E600 fixed switches
- IGMP snooping: 60s on S series modular switches and 125s on S series and E600 fixed switches
- MLD: 125s on S series switches and E600 fixed switches
- MLD snooping: 60s on S series modular switches and 125s on S series and E600 fixed switches

Other related questions:
Why does an S series switch generate an error message during link aggregation configuration
When adding an interface of an S series switch (except the S1700) to an Eth-Trunk, ensure that the interface is of the same type as the other member interfaces and the interface does not have any configurations. Follow these guidelines: 1. Each Eth-Trunk contains a maximum of eight member interfaces by default. 2. An Eth-Trunk cannot be added to another Eth-Trunk. 3. Member interfaces of an Eth-Trunk must use the same Ethernet type and rate. Interfaces that use different Ethernet types and rates cannot join the same Eth-Trunk. For instance, GE interfaces and FE interfaces cannot join the same Eth-Trunk, but GE electrical interfaces and GE optical interfaces can join the same Eth-Trunk.

In which situation can an S series switch send the option field in Request messages to a client
For S series switches excluding the S1700, the DHCP server returns the corresponding option field to a client only when the corresponding option field is encapsulated in the Request message.

Does an S series switch sends a Report message after receiving a Query message
If only IGMP snooping is enabled, an S series switch does not send Report messages after receiving Query messages. If IGMP snooping proxy or IGMP snooping Report suppression is also configured, the switch can construct and send Report messages according to existing entries after receiving Query messages.

What is the function of the interval for sending Query messages on an S series switch?
For an S series switch, the interval for sending Query messages configured in a VLAN using the igmp-snooping query-interval command is used to: - Control the interval at which Query messages are sent after the querier function is enabled in the VLAN. - Calculate the aging time of dynamic member ports using the following formula: Aging time = Robustness variable x Query interval + Maximum response time Therefore, the interval is useful even when IGMP snooping querier is not enabled. In addition, you must configure the same interval on all devices when configuring IGMP snooping. Otherwise, some user-side interfaces may be incorrectly deleted, causing multicast forwarding interruption.

How do S series switches generate ARP Miss messages
For S series switches (except S1700 switches): If a host sends an IP packet with an irresolvable destination IP address to attack an S series switch, ARP Miss messages are generated on the device because the device has a route to the destination IP address but has no ARP entry matching the next hop in the route. The device generates and delivers temporary ARP entries based on ARP Miss messages and sends ARP Request packets to the destination network.

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