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Table 6 Interface Numbering on Cisco 2801 Series Routers
Slot Number Slot Type Interface Numbering Range
Onboard ports Fast Ethernet 0/0 and 0/1
0 VIC/VWIC (voice only—no PRI support) 0/0/0 to 0/0/3
1 HWIC/WIC/VIC/VWIC
1
0/1/0 to 0/1/3 (single-wide HWIC)
0/1/0 to 0/1/8 (double-wide HWIC)
2WIC/VIC/VWIC
1
0/2/0 to 0/2/3
3 HWIC/WIC/VIC/VWIC
1
0/3/0 to 0/3/3 (single-wide HWIC)
0/3/0 to 0/3/8 (double-wide HWIC)
1. A VWIC in slots 1, 2, and 3 can operate in both data and voice mode; in slot 0, a VWIC can operate only in voice mode.
On the Cisco 2801 router, the numbering format for configuring an asynchronous interface is 0/slot/port. To configure the line
associated with an asynchronous interface, simply use the interface number to specify the asynchronous line. For example,
line 0/1/0 specifies the line associated with interface serial 0/1/0 on a WIC-2A/S in slot 1. Similarly, line 0/2/1 specifies the line
associated with interface async 0/2/1 on a WIC-2AM in slot 2.
Table 7 Interface Numbering on Cisco 2811, Cisco 2821, and Cisco 2851 Series Integrated Services Routers
Port Location Interface Numbering Scheme Examples
1,
2
Built into the chassis front panel Interface-type port usb 0
usb 1
Built into the chassis rear panel Interface-type 0 / port interface fa 0/x
interface gi 0/x
In an interface card (HWIC,
HWIC-D, WIC, VWIC, VIC)
plugged directly into an HWIC slot
in a chassis
Interface-type 0 / interface-card-slot
3
/ port
Note
Interface card slots built into the chassis are labeled
HWIC slot-number on
Cisco 2800 series routers.
interface serial 0/x/y
interface async 0/x/y
line 0/x/y
4
interface fa 0/x/y
voice-port 0/x/y
In an interface card (WIC, VWIC,
VIC) plugged into a slot in a network
module
Interface-type 1
5
/ interface-card-slot / port controller t1 1/x/y
voice-port 1/x/y
interface serial 1/x/y
interface async 1/x/y
line 1/x/y
4
Built into a network module (NME,
NME-X, NMD, NME-XD)
Interface-type 1
5
/ port interface gi 1/x
interface serial 1/x
interface async 1/x
line 1/x
4
FXS or FXO port in an extension
voice module (EVM)
Interface-type 2
6
/ 0
7
/ port
FXS/DID port numbers 0 to 7 are built into the EVM.
FXS/FXO port numbers 8 to 15 are in expansion module 0.
FXS/FXO port numbers 16 to 23 are in expansion module 1.
voice-port 2/0/x
Voice port in a BRI expansion
module (internal slot) in an
extension voice module (EVM)
Interface-type 2
6
/ 0
7
/ port
Port numbers are 8 to 11 in expansion module 0.
Port numbers are 16 to 19 in expansion module 1.
voice-port 2/0/x
BRI interface in a BRI expansion
module (internal slot) in an
extension voice module (EVM)
Interface-type 2
6
/ port
Port numbers are 0 to 3 if one expansion module is installed.
Port numbers are 0 to 7 if two expansion modules are installed.
interface bri 2/x