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This chapter explains the function and syntax of the interface commands interface fastethernet through loopback line. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS Interface Command Reference, Release 12.1.
To select a particular Fast Ethernet interface for configuration, use the interface fastethernet global configuration command.
Cisco 4500 and 4700 series
interface fastethernet number
Cisco 7200 series
interface fastethernet slot/port
Cisco 7500 series
interface fastethernet slot/port-adapter/port
Syntax Description
number Port, connector, or interface card number. On a Cisco 4500 or 4700 series routers, specifies the NIM or NPM number. The numbers are assigned at the factory at the time of installation or when added to a system. slot Number of the slot being configured. Refer to the appropriate hardware manual for slot and port information. port Number of the port being configured. Refer to the appropriate hardware manual for slot and port information. port-adapter Number of the port-adapter being configured. Refer to the appropriate hardware manual for information about port adapter compatibility.
To create a group interface that will serve as master, to which asynchronous interfaces can be associated as members, use the interface group-async global configuration command. To restore the default, use the no form of this command.
interface group-async unit-number
Syntax Description
unit-number Number of the asynchronous group interface being created.
To specify a Fast EtherChannel and enter interface configuration mode, use the interface port-channel global configuration command.
interface port-channel channel-number
Syntax Description
channel-number Channel number assigned to this port-channel interface. Range is 1 to 4.
To specify the Packet OC-3 interface on the Packet-over-SONET (POS) interface processor and enter interface configuration mode, use the interface pos global configuration command.
Cisco 7000 and Cisco 7500 series routers with VIPs
interface pos slot/port-adapter/port
Cisco 7200 series routers
interface pos slot/port
Syntax Description
slot Specifies the backplane slot number. port On Cisco 7000 series and Cisco 7500 series routers, specifies the ports on a VIP card. The value must be 0. port-adapter Port number on the interface. The value must be 0.
To specify the interface on a 100VG-AnyLAN port adapter and enter interface configuration mode on Cisco 7200 series routers and Cisco 7500 series routers, use the interface vg-anylan global configuration command.
Cisco 7500 series routers with VIPs
interface vg-anylan slot/port-adapter/port
Cisco 7200 series routers
interface vg-anylan slot/port
Syntax Description
slot Number of the slot being configured. Refer to the appropriate hardware manual for slot and port information. port Number of the port being configured. Refer to the appropriate hardware manual for slot and port information. port-adapter Number of the port-adapter being configured. Refer to the appropriate hardware manual for information about port adapter compatibility.
To set the E3 international bit in the G.751 frame used by the PA-E3 port adapter, use the international bit interface configuration command. To return to the default international bit, use the no form of this command.
international bit {0 | 1} {0 | 1}
Syntax Description
0 | 1 Specifies the value of the first international bit in the G.751 frame. The default is 0. 0 | 1 Specifies the value of the second international bit in the G.751 frame. The default is 0.
To invert the data stream, use the invert data interface configuration command. This command applies only to the Cisco 7000 series routers with the RSP7000 and RSP7000CI, Cisco 7200 series routers, and Cisco 7500 series routers. To disable inverting the data stream, use the no form of this command.
invert dataSyntax Description
This command has no arguments or keywords.
To configure UIO serial port 0 or 1 on the Cisco MC3810 when the cable connected is DCE type, use the invert rxclock interface configuration command. The command inverts the phase of the RX clock on the UIO serial interface, which does not use the T1/E1 interface. To disable the phase inversion, use the no form of this command.
invert rxclockSyntax Description
This command has no arguments or keywords.
The invert txclock command replaces this command. Refer to the description of invert txclock for information on the transmit clock signal.
To invert the transmit clock signal, use the invert txclock interface configuration command. This command applies only to Cisco 7200 series and Cisco 7500 series routers. To return to the transmit clock signal to its initial state, use the no form of this command.
invert txclockSyntax Description
This command has no arguments or keywords.
To set the keepalive timer for a specific interface, use the keepalive interface configuration command. To turn off keepalives entirely, use the no form of this command.
keepalive [seconds]
Syntax Description
seconds (Optional) Integer value greater than 0. The default is 10.
Syntax Description
ieee-address 48-bit IEEE MAC address written as a dotted triplet of four-digit hexadecimal numbers.
Syntax Description
access-list-number Number of the access list assigned with the access-list global configuration command. It can be a number from 700 to 799.
Syntax Description
access-list-number Number of the access list you assigned with the access-list command. It can be a number in the range 200 to 299.
Syntax Description
group Number of the priority group. It can be a number in the range 1 to 10.
To define the number of times to resend commands to the LAN Extender chassis, use the lex retry-count interface configuration command. To return to the default value, use the no form of this command.
lex retry-count number
Syntax Description
number Number of times to retry sending commands to the LAN Extender. It can be a number in the range 0 to 100. The default is 10.
To define the amount of time to wait for a response from the LAN Extender, use the lex timeout interface configuration command. To return to the default time, use the no form of this command.
lex timeout milliseconds
Syntax Description
milliseconds Time, in milliseconds, to wait for a response from the LAN Extender before resending the command. It can be a number in the range 500 to 60000. The default is 2000 ms.
To select the line-code type for T1 or E1 line, use the linecode controller configuration command.
linecode {ami | b8zs | hdb3}
Syntax Description
ami Specifies alternate mark inversion (AMI) as the line-code type. Valid for T1 or E1 controllers. This is the default for T1 lines. b8zs Specifies B8ZS as the line-code type. Valid for T1 controller only. hdb3 Specifies high-density bipolar 3 (hdb3) as the line-code type. Valid for E1 controller only. This is the default for E1 lines.
To specify the line termination for the E1 port on a trunk card, use the line-termination controller command. To return to the default line termination, use the no form of this command.
line-termination {75-ohm | 120-ohm}
Syntax Description
75-ohm Specify 75-ohm unbalanced termination. 120-ohm Specify 120-ohm balanced termination. This is the default.
Syntax Description
This command has no arguments or keywords.
To enable Lanoptics Hub Networking Management of a PCbus Token Ring interface, use the local-lnm interface configuration command. To disable Lanoptics Hub Networking Management, use the no form of this command.
local-lnmSyntax Description
This command has no arguments or keywords.
To diagnose equipment malfunctions between the interface and device, use the loopback interface configuration command. To disable the test, use the no form of this command.
loopbackSyntax Description
This command has no arguments or keywords.
To loop the serial interface on a PA-E3 or a PA-T3 port adapter, use the loopback interface configuration command. To remove the loopback, use the no form of this command.
PA-E3 port adapter
loopback {dte | local | network {line | payload}}
no loopback
PA-T3 port adapter
loopback {dte | local | network {line | payload} | remote}
no loopback
Syntax Description
dte Sets the loopback after the LIU toward the terminal. local Sets the loopback after going through the framer toward the terminal. network {line | payload} Sets the loopback toward the network before going through the framer (line) or after going through the framer (payload). remote Sends a far-end alarm control (FEAC) to set the remote framer in loopback.
To loop individual T1 channels on the CT3IP in Cisco 7000 series routers with the RSP7000 and RSP7000CI and in Cisco 7500 series routers, use the loopback interface configuration command. To remove the loopback, use the no form of this command.
loopback [local | network {line | payload} | remote {line {fdl {ansi | bellcore} | inband} | payload [fdl] [ansi]}]
Syntax Description
local (Optional) Loops the router output data back toward the router at the T1 framer and sends an AIS signal out toward the network. network {line | payload} (Optional) Loops the data back toward the network before the T1 framer and automatically sets a local loopback at the HDLC controllers (line) or loops the payload data back toward the network at the T1 framer and automatically sets a local loopback at the HDLC controllers (payload). remote line fdl {ansi | bellcore} (Optional) Sends a repeating, 16-bit ESF data link code word (00001110 11111111 for FDL ANSI and 00010010 11111111 for FDL Bellcore) to the remote end requesting that it enter into a network line loopback. Specify the ansi keyword to enable the remote line Facility Data Link (FDL) ANSI bit loopback on the T1 channel, per the ANSI T1.403 Specification. Specify the bellcore keyword to enable the remote SmartJack loopback on the T1 channel, per the TR-TSY-000312 Specification. remote line inband (Optional) Sends a repeating, 5-bit inband pattern (00001) to the remote end requesting that it enter into a network line loopback. remote payload [fdl] [ansi] (Optional) Sends a repeating, 16-bit ESF data link code word (00010100 11111111) to the remote end requesting that it enter into a network payload loopback. Enables the remote payload Facility Data Link (FDL) ANSI bit loopback on the T1 channel. You can optionally specify fdl and ansi, but it is not necessary.
To loop the entire T3 (all 28 T1 channels) on the CT3 in a Cisco AS5800 universal access server, or on the CT3IP in Cisco 7500 series routers, use the loopback controller configuration command. To remove the loopback, use the no form of this command.
loopback [local | network | remote]
Syntax Description
local (Optional) Loops the data back toward the router and sends an AIS signal out toward the network. network (Optional) Loops the data toward the network at the T1 framer. remote (Optional) Sends a far-end alarm control (FEAC) request to the remote end requesting that it enter into a network line loopback. FEAC requests (and therefore remote loopbacks) are only possible when the T3 is configured for C-bit framing. The type of framing used is determined by the equipment you are connecting to (for more information, see the framing controller command).
To configure an internal loop on the HSSI applique, use the loopback applique interface configuration command. To remove the loop, use the no form of this command.
loopback appliqueSyntax Description
This command has no arguments or keywords.
To loop packets back to the DTE from the CSU/DSU, when the device supports this feature, use the loopback dte interface configuration command. To remove the loop, use the no form of this command.
loopback dteSyntax Description
This command has no arguments or keywords.
To loop packets completely through the CSU/DSU to configure the CSU loop, use the loopback line interface configuration command. To remove the loop, use the no form of this command.
loopback line [payload]
Syntax Description
payload (Optional) Configures a loopback point at the DSU and loops back data to the network on an integrated CSU/DSU.
Posted: Wed Jul 26 12:56:08 PDT 2000
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