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XPress-Pro SW 94000 User Guide 12
Whether the source MAC address or destination MAC address is to be filtered.
Whether the source port ID is the same as destination port ID.
If any of these conditions are met, the Xpress-Pro SW 94000 switch drops the receiving
packet. Otherwise, it continues with the forwarding process described below.
Forwarding
During the forwarding process, the Xpress-Pro SW 94000 switch checks whether the
<destination MAC address, VLAN> pair is unknown.
If it is unknown, the Xpress-Pro SW 94000 switch floods the receiving frame to all ports in
the VLAN, excluding the source port.
If it is known, the Xpress-Pro SW 94000 switch forwards the receiving frame to the port
associated with the <destination MAC address, VLAN> pair. At the same time, the
Xpress-Pro SW 94000 switch ascertains the individual’s port’s VLAN tagging/untagging
configuration and corresponding VLAN ID to render the appropriate frame tagging when
the frame is ready to be transmitted.
MULTICAST SWITCHING
For multicast switching, the Xpress-Pro SW 94000 switch checks whether the received
frame is a BPDU. If a BPDU is received, the Xpress-Pro SW 94000 switch forwards the
frame to the CPU for processing by the spanning tree protocol. Otherwise, the Xpress-
Pro SW 94000 switch performs the following processes:
VLAN classification
Same as for unicast switching.
Learning
Same as for unicast switching.
Filtering
After learning the address, the Xpress-Pro SW 94000 switch checks:
Whether the source port or destination port is not in the forwarding state.
Whether the source MAC address or destination MAC address is to be filtered.
If any of these conditions are met, the Xpress-Pro SW 94000 switch drops the receiving
packet. Otherwise, it continues with the forwarding process described below.
Forwarding
The Xpress-Pro SW 94000 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
Xpress-Pro SW 94000 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.