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7 Interface Numbering

Each individual interface (port) on a Cisco 3725 router is identified by number as described in the following sections.

WAN and LAN Interface Numbering

The Cisco 3725 router chassis contains the following WAN and LAN interface types:

• Two built-in Fast Ethernet LAN interfaces

• Three slots in which you can install WAN interface cards (WICs)

• One single-width slot (slot 1) in which you can install one network module

• One double-width slot (slot 2) in which you can install one single-width or double-width network module

The numbering format is Interface-type Slot-number/Interface-number. Two examples are:

• FastEthernet 0/0

• Serial 1/2

The slot numbers are as follows:

• 0 for all built-in interfaces

• 0 for all WIC interfaces

• 1 for interfaces in the single-width network module slot

• 2 for interfaces in the double-width network module slot

Interface (port) numbers begin at 0 for each interface type, and continue from right to left and (if necessary) from bottom to top.

Figure 14 shows an example of interface numbering on a Cisco 3725 router with:

• A WIC in each WIC slot (containing interfaces Serial 0/0 and Serial 0/1 in physical slot W0, interface Serial 0/2 in physical

slot W1, and interface BRI 0/0 in physical slot W2)

• A 2-port T1 network module in slot 1 (containing the following ports: T1 1/0 and T1 1/1)

• A 36-port EtherSwitch network module in slot 2 (containing the following ports: Fast Ethernet 2/0 through 2/35, and

Gigabit Ethernet 2/0 and 2/1)

• Two built-in Ethernet 10/100 interfaces—Fast Ethernet 0/0 and Fast Ethernet 0/1

Figure 14 WAN and LAN Interface Numbering

Serial 0/2

Compact

Flash slot

56482

SEE MANUAL BEFORE INSTALLATION

DSU

56K

SEE MANUAL BEFORE INSTALLATION

DSU

56K

BANK 4

BANK 3

BANK 2

BANK 1

BANK 0

NM-HDV

VWIC

2MFT-E1

SEE

MANUAL

BEFORE

INSTALLATION

CTRLR E2

CTRLR E1

Gigabit Ethernet 2/1

Fast Ethernet 2/35

Fast Ethernet 2/17

Gigabit Ethernet 2/0

Fast Ethernet 2/0

Fast Ethernet 2/18

Serial 0/1

Serial 0/0

TI 1/1

TI 1/0

Fast Ethernet 0/1

Fast Ethernet 0/0

BRI 0/0

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32

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