Planet IDL-2402 User Manual page 96

Upstream:
C-Tag (User port)-----(Uplink port) S-Tag
Downstream:
S-Tag (Uplink port)-----(User port) C-Tag
3. Stacking
In this mode, the system will add S-TAG before user port's C-TAG. Note that
the mapping from C-Tag to S-Tag+C-Tag is still one to one. So a user port's
C-Tag can't be used for another translation rule, as well as an uplink port's
S-Tag+C-Tag.
Upstream:
C-Tag (User port)-------(Uplink port) S-Tag+C-Tag
Downstream:
S-Tag+C-Tag (Uplink port)--------(User port) C-Tag
4. Stacking and Replaced
In this mode, the system will replace the user port's C-Tag to C'-Tag and add
S-Tag before C'-Tag. Note that the mapping from C-Tag to S-Tag+C'-Tag is
still one to one. So a user port's C-Tag can't be used for another translation
rule, as well as an uplink port's S-Tag+C'-Tag.
Upstream:
C-Tag (User port)-------(Uplink port) S-Tag+C'-Tag
Downstream:
S-Tag+C'-Tag (Uplink port)--------(User port) C-Tag
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