32
Figure 27
Slot arrangement on the MSR 20-40
(1) Slot 1
(2) Slot 2
(3) Slot 3
(4) Slot 4
Interface numbering
The MSR 20 Router interface adopts “two dimension” numbering rules, shown in the following:
•
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.
•
Fixed interfaces are on Slot 0.
•
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.