Multicast Switching - SMC Networks 6724L2 - annexe 1 Management Manual

- If unknown, the switch floods the received frame to all ports
in the VLAN, excluding the source port.
- If known, the switch forwards the received frame to the port
associated with the pair. At the same time, the switch decides
whether a VLAN tag needs to be added to or stripped from
the frame, depending on the VLAN tagged/untagged
configuration and VLAN ID for the output port.
• Aging—the switch performs the aging process for the <MAC
addresses, VLAN> pair in the MAC address table. Once a pair is
aged out, the address table is modified.

Multicast Switching

For multicast switching, the switch checks whether the received
frame is a Bridge Protocol Data Unit (BPDU). If a BPDU is
received, the switch forwards the frame for processing by the
Spanning Tree Protocol. Otherwise, the switch performs the
following processes:
• VLAN classification—same as for unicast switching (page 4-2).
• Learning—same as for unicast switching (page 4-2).
• Filtering—after learning, the switch checks the same filtering
criteria used for unicast switching (page 4-2), except there is no
destination MAC address to check.
• Forwarding—the switch floods the received multicast frame to
all ports within the VLAN, excluding the source port. At the
same time, the switch decides whether a VLAN tag needs to be
added to, or stripped from, the frame, depending on the VLAN
tagged/untagged configuration and VLAN ID for the output port.
• Aging—same as for unicast switching (page 4-2).
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AYER WITCHING
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