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User
’s Manual 7
Manageable 8/9-Port Switch
MULTICAST SWITCHING
For multicast switching, the D-GES7600 checks whether the received frame is a BPDU. If a
BPDU is received, the switch forwards the frame to the CPU for processing by the spanning
tree protocol. Otherwise, the D-GES7600 performs the following processes:
VLAN CLASSIFICATION
Same as for unicast switching.
LEARNING
Same as for unicast switching.
FILTERING
After learning the address, the switch checks:
- Whether the source port or destination port is not in the following state.
- Whether the source MAC address or destination MAC address is to be filtered.
If any of these conditions are met, the switch drops the receiving.
Otherwise, it continues with the forwarding process described below.
FORWARDING
The D-GES7600 floods the received multicast frame to all ports that are in the forwarding
state within the VLAN, excluding the source port. At the same time, the switch
ascertains the individual ports VLAN tagging/untagging configuration and
corresponding VLAN 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 SBD is modified.
SPANNING TREE
The D-GES7600 supports one Spanning Tree per bridged network.