To prevent an IGMP Snooping Proxy-enabled device and its upstream device from learning multicast forwarding entries from each other, configure them to transparently transmit protocol packets.
If IGMP Snooping Proxy is enabled on a Layer 2 device and its upstream device, these devices will learn the same multicast entries. As a result, the upstream device will continuously send Query messages to which the downstream device responds, causing multicast entries not to age. Consequently, multicast protocol and data packets are forwarded unnecessarily, wasting bandwidth.
To solve this problem, configure these devices to transparently transmit protocol packets. After this function is enabled, these devices can transparently transmit IGMP messages received from a router port to other router ports, instead of learning the multicast entries created based on these IGMP messages. This function ensures a proper aging of multicast entries.
The system view is displayed.
IGMP Snooping Proxy-enabled devices in the VLAN or VSI are configured to transparently transmit protocol packets.
An interface is configured as an IGMP snooping proxy uplink interface, so that no IGMP Query message can be sent to this interface.
The configuration is committed.