TP-Link T2600G-28TS Reference Manual page 172

Command Mode
Privileged EXEC Mode and Any Configuration Mode
Privilege Requirement
None.
Example
Display the configuration information of PPPoE Circuit-ID Insertion function of
all Ethernet ports:
T2600G-28TS# show pppoe id-insertion interface
Display the configuration of PPPoE Circuit-ID Insertion function of the Gigabit
Ethernet port 1/0/1 :
T2600G-28TS# show pppoe id-insertion interface gigabitEthernet 1/0/1
152