1. Introduction-9
LEARNING
Same as for unicast switching.
FILTERING
After learning the address, the switch checks:
l
Whether the source port or destination port is not in the
forwarding state.
l
Whether the source MAC address or destination MAC
address is to be filtered.
l
Whether the source port ID is the same as destination port
ID.
If any of these conditions are met, the switch drops the receiving.
Otherwise, it continues with the forwarding process described
below.
FORWARDING
The switch floods the received multicast frame to all ports that
are in forwarding state within the VLAN, excluding the source
port. At the same time, the switch ascertains the individual port’s
VLAN tagging/untagging configuration and corresponding VLAN
ID to render the appropriate frame tagging when the frame is
ready to be transmitted.
AGING
The switch performs the aging process for the <MAC addresses,
VLAN> pair in the switching database. Once a <MAC address,
VLAN> pair is aged out, the SDB is modified.
SPANNING TREE
The switch supports one Spanning Tree per bridged network.
