The multicast mac-ip check enable command enables the function of checking the mapping between multicast IP and MAC addresses.
The undo multicast mac-ip check enable command disables the function of checking the mapping between multicast IP and MAC addresses.
By default, the function of checking the mapping between multicast IP and MAC addresses is disabled.
Product |
Support |
|---|---|
S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S |
Supported |
S2720-EI, S5720I-SI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S5720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5730S-EI, S5730-SI, S6720-LI, S6720S-LI, S6720S-SI, and S6720-SI |
Not supported The S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S check the mapping between multicast IP and MAC addresses for received packets by default. Packets that fail the check cannot be forwarded based on IP addresses, but can be forwarded based on MAC addresses. Other switch models do not perform this check, but instead forward the received packets normally. |
To enable multicast sources and group members to communicate, network-layer multicast services must be provided using multicast IP addresses. To enable multicast data to be correctly transmitted on the local physical network, link-layer multicast services must be provided using multicast MAC addresses. The destination address of a multicast data packet is a group with unknown members but not a specific receiver. Therefore, multicast IP addresses must be mapped to multicast MAC addresses. For the detailed mapping between multicast IP and MAC addresses, see Multicast Addresses under IP Multicast Configuration Guide > Understanding IP Multicast in the S2720, S5700, and S6700 V200R019C10 Configuration Guide.
By default, the function of checking the mapping between multicast IP and MAC addresses is disabled. Therefore, packets with incorrect mapping will be processed normally. After the mapping between multicast IP and MAC addresses is enabled, different products process multicast packets in different modes. The following table provides the details.
Product |
How Multicast Packets Are Processed |
|---|---|
S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S |
Packets with incorrect IP and MAC address mapping are discarded. |
S5720-EI, S6720-EI, and S6720S-EI |
If no MAC address entries are available for the packets with incorrect IP and MAC address mapping, the packets are forwarded as unknown multicast packets. For the forwarding process of unknown multicast packets, see multicast drop-unknown. |