Planet IDL-2402 User Manual page 97

N:1 VLAN (N:1 User Mode):
N:1 can also be called shared VLAN, so in this mode MAC learning function of the bridge
ports must not be disabled.
1. Replaced N:1
In this mode, the system will change the user port's C-Tag to the Uplink port's
S-Tag. And the mapping is N to 1, so a user port's C-Tag can't be used for
another VLAN translation rule. But an uplink port's S-Tag can be used for
another N:1 VLAN translation rule.
So in this mode several bridge ports can have the same VLAN cross-connect
rule.
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