Cisco 3800 Series - Manual (Page 23)

Port Numbering
9
Overview of Cisco 3800 Series Routers
OL-5966-01
Certain interface card configurations require the installation or removal of a slot divider in the router’s
interface card slot. All slots must be covered by interface cards or blank faceplates for cooling,
electromagnetic interference (EMI) reduction, and safety. Procedures for installing interface cards, slot
dividers, and blank faceplates are described in
“Installing Interface Cards in Cisco 3800 Series Routers”
and the Cisco Interface Cards Installation Guide .
AIMS and PVDMs
Advanced integration modules (AIMs) and packet voice data modules (PVDMs) install into connectors
on the router motherboard. AIMs provide hardware-based support for additional features. PVDMs are
digital signal processor (DSP) SIMMs that provide voice support. The Cisco 3825 router and the
Cisco 3845 router can each accommodate two AIMs and four PVDMs.
Installation, replacement, and removal of AIMs and PVDMs require opening the cover of the Cisco 3825
router, or removing the motherboard of the Cisco 3845 router. For more information, see “
Installing and
Upgrading Internal Components in Cisco 3800 Series Routers .”
Port Numbering
Each built-in network port on a Cisco 3800 series router, and each port or interface 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 Port numbering conventions differ for different router series. For routers that are not part of the
Cisco 3800 series, consult your router documentation for port numbering information.
Built-In Ports
Cisco 3800 series routers have two Gigabit Ethernet ports built into the router’s rear panel, labeled 0/0
and 0/1. These numbers are used with the interface-type keyword gigabitethernet to identify the ports
in Cisco IOS commands—gigabitethernet 0/0 and gigabitethernet 0/1.
Note If an optional SFP module is installed and selected, it is assigned gigabitethernet 0/0.
Network Module Ports
Ports on network modules inserted into a router slot are numbered slot/port, where slot is the slot number
in the router and port is the port number in the network module. For example, port 1 of a Fast Ethernet
network module inserted into router slot 2 would be identified as fastethernet 2/1.
The Cisco 3825 router has two slots for network modules. The lower slot is numbered 1 and the upper
slot is numbered 2, as labeled on the router’s rear panel. (See
Figure 4 on page 3 .) The Cisco 3845 router
has four slots: 1 at lower right, 2 at lower left, 3 at upper right, and 4 at upper left. (See Figure 8 on
page 5 .)