Example 6 – Basic understanding of VLANs with Multicast Filtering

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Receiving

 

 

Tagged VID

 

Destination

 

 

Transmitting

 

 

Notes

Port #

 

 

in packet

 

Address

 

 

Port #s

 

 

 

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 710FX2 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

(Revised 2010-9-27)

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N-Tron 710FX2 user manual TX8