How is IGMPv3 snooping proxy configured on an S series switch

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For S series switches excluding the S1700, when IGMPv3 snooping proxy, perform the following configurations:
1. System view:
igmp-snooping enable
2. VLAN view:
igmp-snooping enable
igmp-snooping version 3
igmp-snooping proxy enable
The device provides IGMPv1/v2/v3 proxy.

Other related questions:
How can I configure IGMP snooping proxy to support IGMPv3
To configure IGMP snooping proxy to support IGMPv3, perform the following configuration: 1. In the system view: igmp-snooping enable 2. In the VLAN view: igmp-snooping enable igmp-snooping version 3 igmp-snooping proxy enable The preceding configuration implements IGMP snooping proxy for IGMP v1/v2/3.

Do S series switches support IGMPv3 snooping
S series switches support only a simplified version of IGMPv3. In this version, either (*, G) entries or (S, G) entries will be generated for a multicast group. If (*, G) entries are generated, data of all sources is received. If (S, G) entries are generated, data of a specific source is received. If the specified group address is in the SSM group address range, only source-specific programs can be ordered.

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.

Proxy ARP configuration on S series switch
An S series switch, except S1700, supports the following proxy ARP: routed proxy ARP, intra-VLAN proxy ARP, and inter-VLAN proxy ARP, which are configured using the arp-proxy enable, arp-proxy inner-sub-vlan-proxy enable, and arp-proxy inter-sub-vlan-proxy enable commands respectively. Routed proxy ARP (available on all models in V2R5 and later versions, but unavailable on S275x and S5700LI in the versions earlier than V2R5) The destination IP address in the received ARP request packet and the IP address of the inbound interface are in different subnets, but there is a route to the destination IP address and the outbound/inbound interfaces of the route are different. Routed proxy ARP takes effect in this situation. The switch uses its MAC address as the source MAC address to return ARP reply packets. Intra-VLAN proxy ARP (available on all models in V2R5 and later versions, but unavailable on S275x and S5700LI in the versions earlier than V2R5) If the destination IP address of the received ARP request packet and the IP address of the inbound interface are in the same subnet, intra-VLAN proxy ARP takes effect. Inter-VLAN proxy ARP (unavailable on S1720, S2720, S275x, S5700LI and E series switches) It is similar to intra-VLAN proxy ARP. Inter-VLAN proxy ARP takes effect only on super VLAN. If the destination IP address of the received ARP request packet and the IP address of the inbound interface are in the same subnet, inter-VLAN proxy ARP takes effect. If the source and destination are in the same VLAN, inter-VLAN proxy ARP is not required. Regardless of which type of proxy ARP is used, the destination IP address of the received ARP request packet and the IP address of the inbound interface must be in the same subnet.

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.

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