Example 6 – Basic understanding of VLANs with Multicast Filt ering

Top of Form

Bottom of Form

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 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

Revision 071108

Page 99 of 102

Page 99
Image 99
N-Tron 708M12 user manual TX8