Can a host receive data from multiple multicast sources after IGMP snooping is configured on an S series switch

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With IGMP snooping configured, the Layer 2 switch listens to and analyzes IGMP packets exchanged between multicast users and the upstream router, and creates Layer 2 multicast forwarding entries accordingly. Multicast data packets are then forwarded based on the Layer 2 multicast forwarding entries, instead of being broadcast on the Layer 2 network.
Layer 2 multicast is irrelevant to the number of multicast sources. For S series switches excluding the S1700, to enable IGMP snooping in VLAN 10, perform the following configurations:
[HUAWEI] igmp-snooping enable //Enable IGMP snooping globally.
[HUAWEI] vlan 10
[HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in VLAN 10.

Other related questions:
Why does an S series switch receive much multicast traffic when IGMP snooping is not configured?
The destination address of these multicast data packets is a multicast group address, of which the MAC address entries cannot be learned on the Layer 2 switch. Therefore, the switch broadcasts the multicast data packets to all the interfaces in the same broadcast domain. All hosts in the broadcast domain will receive the multicast data packets, regardless of whether or not they are members of the multicast group. Much network bandwidth is occupied and multicast traffic is heavy. IGMD snooping solves this preceding problem. With IGMP snooping configured, the Layer 2 switch listens to and analyzes IGMP packets exchanged between multicast users and the upstream router, and creates Layer 2 multicast forwarding entries accordingly. Multicast data packets are then forwarded based on the Layer 2 multicast forwarding entries, instead of being broadcast on the Layer 2 network. Layer 2 multicast is irrelevant to the number of multicast sources. For S series switches excluding the S1700, to enable IGMP snooping in VLAN 10, perform the following configurations: [HUAWEI] igmp-snooping enable //Enable IGMP snooping globally. [HUAWEI] vlan 10 [HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in VLAN 10.

IGMP snooping parameters of an S series switch
The following IGMP snooping parameters are provided: - Query-interval: specifies the interval for sending General Query messages. The system starts an aging timer for a member port when the port receives a Report message. The aging time is calculated using the following formula: Aging time = Robust variable x Query interval + Maximum response time for General Query messages On the S series modular switch, the default value is 60s. On S and E series fixed switches excluding the S1700, the default value is 125s. - Max-response-time: specifies the maximum response time for a Query message. After receiving a Query message, a device must send a response message within the specified time. The device may send the Report message at any time before the maximum response time expires. The default interval is 10s. - Robust-count: specifies the IGMP robustness variable. This parameter is set based on the link performance. If a link is unstable and many packets are discarded, increase the robustness variable. The default robustness variable is 2. - Last-member-query-interval: specifies the interval for sending Last Member Query messages. In IGMPv2 and IGMPv3, the system starts an aging timer for a member port when the port receives a Leave message. The aging time is calculated using the following formula: Aging time = Robust variable x Interval for sending Last Member Query messages The default interval is 1s. If the IGMP snooping querier is not configured, the parameter is used to calculate the aging time of member ports. - After a member port receives a Report message from the downstream host, the aging time is as follows: Aging time = Robust variable x Query interval + Maximum response time for General Query messages - After a member port receives a Leave message from the downstream host, the aging time is as follows: Aging time = Robust variable x Interval for sending Last Member Query messages Run the display igmp-snooping command to check parameter settings on an S series switch excluding the S1700.

IGMP snooping configuration on S series switch
With IGMP snooping configured, the switch listens to and analyzes IGMP packets exchanged between multicast users and the upstream router, and creates Layer 2 multicast forwarding entries based on IGMP packet information. Multicast data packets are then forwarded based on the Layer 2 multicast forwarding entries, instead of being broadcast on the Layer 2 network. For example, to enable IGMP snooping in VLAN 10 on an S series switch, except S1700, run the following commands: [HUAWEI] igmp-snooping enable //Enable IGMP snooping globally. [HUAWEI] vlan 10 [HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in the VLAN.

Difference between IGMP snooping and IGMP snooping proxy on an S series switch
IGMP snooping and IGMP snooping proxy have the same functions but different mechanisms. IGMP snooping obtains required information by listening to IGMP messages; IGMP snooping proxy intercepts and suppresses IGMP requests of terminal users, and then forwards the requests to the router. The Layer 2 network device with IGMP Snooping Proxy configured functions as a server on the user side. It periodically queries user information. On the network side, this switch functions as a client and reports user information after receiving query messages. Therefore, IGMP snooping proxy can not only suppress multicast packets on Layer 2 network, but also reduce the total number of protocol packets on the network. The proxy router is required for maintaining and calculating entry status changes, so the implementation is more complex and the cost is added.

The maximum number of log hosts that can receive logs sent by S series switches
The S series switches (except the S1700) can be configured to send logs to a maximum of eight log hosts (IPv4 and IPv6 log hosts), thus achieving mutual backup among the log hosts.

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