H3C MSR-20-21 ROUTER Installation Manual page 44

The interfaces are represented by interface-type X/Y, where interface-type can be serial,
asynchronous, or Ethernet, and so on; X specifies the slot number; Y specifies the interface
number.
Different interfaces on an interface module share the same slot number X.
For every interface, Y starts from 0 and Y indicates the interface sequence on the interface module,
from left to right.
If you install an SIC-1FEA and an SIC-4FSW respectively in SLOT1 and SLOT2 on the AR MSR 20-20,
the Ethernet interfaces are numbered as follows:
Fixed Ethernet interfaces are Ethernet 0/0 and Ethernet 0/1;
The Ethernet interface on the SIC-1FE is Ethernet 1/0;
The Ethernet interfaces on the SIC-4FSW module are Ethernet 2/0, Ethernet 2/1, Ethernet 2/2 and
Ethernet 2/3.
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