N-Tron Switch 708M12 User Manual download pdf (Page 99)

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Example 6 – Basic understanding of VLANs with Multicast Filtering

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Receiving

Port #

Tagged VID

in packet

Destination

Address

Transmitting

Port #s

Notes

TX1 Untagged 01:00:00:00:00:01 TX2

Goes to ports TX1-TX8, but TX1 can only

send to TX2 (VLAN 4)

TX3 Untagged 01:00:00:00:00:02 TX6, TX8

Goes to ports TX2, TX6-TX8 (VLAN 3) but

filter keeps it on ports TX6 and TX8 only

TX2 Untagged 01:00:00:00:00:01 TX1,TX3-TX8

Goes to ports TX1-TX8, but won’t go back

out the port it came in on

TX2 Untagged 01:00:00:00:00:02 TX1,TX3-TX8 Goes to ports TX1,TX3-TX8

TX3 Untagged 01:00:00:00:00:01 TX2, TX4-TX8 Goes to ports TX2, TX4-TX8

TX6 Untagged 01:00:00:00:00:02 TX8 Goes to port TX8

TX3 Untagged 01:00:00:00:00:02 TX6, TX8 Goes to ports TX6 and TX8

Note: If there are multiple ports on different VLANs, the 708 will apply the static multicast address to the

lowest VLAN-ID that is associated with one of the ports assigned to the static multicast address. If the

lowest VLAN-ID contains all the ports assigned to the static multicast address (an umbrella VLAN), it will

function for all those ports with no problems. This can be achieved with overlapping VLANs.

For further information and examples on overlapping vlans, see:

http://www.n-tron.com/pdf/OverlappingPortVLAN.pdf

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N-Tron Switch 708M12 User Manual Page 99