Port Numbering - Cisco 3845 - Security Bundle Router Quick Start Manual

Verify the Hardware Configuration
To display and verify the hardware features, enter the following commands:
• show version—Displays the system hardware version; the installed software version; the names and sources of configuration
files; the boot images; and the amount of installed DRAM, NVRAM, and flash memory.
• show diag—Lists and displays diagnostic information about the installed controllers, interface processors, and port
adapters. Typical examples are network modules, interface cards (VICs, WICs, HWICs, and AIMs) and PVDMs.
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Port Numbering

Each built-in networking port on a Cisco 3800 series router, and each port on a network module or interface card, is identified
in Cisco IOS software by an interface type and a number or series of numbers separated by forward slashes (/). Port numbers
for Cisco 3800 series routers follow the rules in this section.
Note The interface numbering for Cisco 3800 series routers is different from the numbering in Cisco 3700 series routers.
Built-In Ports
The Gigabit Ethernet ports built into the router's rear panel are numbered 0/0 and 0/1. These numbers are used with the
interface-type keyword gigabitethernet to identify these ports in Cisco IOS software commands—gigabitethernet 0/0 and
gigabitethernet 0/1.
Network Module Ports
Ports on network modules inserted into a router slot are numbered slot/port, where slot is the slot number and port is the port
number.
The Cisco 3825 router has two network module slots. The lower slot is numbered 1; the upper slot is numbered 2. The
Cisco 3845 router has four slots: 1 at lower right, 2 at lower left, 3 at upper right, and 4 at upper left.
Double-wide or extended double-wide network modules use slot numbers 2 and 4.
Note
Ports in a network module are normally numbered from right to left and bottom to top, starting at 0. See the
Modules Hardware Installation Guide
Table 6 summarizes the interface numbering.
Table 6 Port Numbering
Port Location
Built into the chassis rear panel
In an interface card plugged directly
into a chassis slot
In an interface card plugged into a slot
in a network module
Built into a network module
1. The interfaces listed are examples only; other possible interface types are not listed.
2. Interface card slot numbers for double-width interface-card slots are 1 and 3 only.
3. Network module slot numbers are 1 and 2 for the Cisco 3825 router; 1, 2, 3, and 4 for the Cisco 3845 router.
for more information.
Port Numbering Scheme
Interface-type 0 / port
Interface-type 0 / interface-card-slot
Interface-type network-module-slot
interface-card-slot / port
Interface-type network-module-slot / port
Examples
interface gigabitethernet 0/1
2
/ port interface serial 0/1/1
3
/ voice-port 1/1/0
interface gigabitethernet 1/0
Cisco Network
1
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