Interface Commands

To download an executable image from a TFTP server to the LAN Extender, use the copy tftp lex privileged EXEC command.

crc size
no crc

To set the length of the cyclic redundancy check (CRC) on a Fast Serial Interface Processor (FSIP) or HSSI Interface Processor (HIP) of the Cisco 7000 series and Cisco 7500 series only, use the crc interface configuration command. To set the CRC length to 16 bits, use the no form of this command.

[no] crc4 

To enable generation of the G.703-E1 CRC4, use the crc4 interface configuration command. To disable this feature, use the no form of this command.

[no] dce-terminal-timing enable

When running the line at high speeds and long distances, use the dce-terminal-timing enable interface configuration command to prevent phase shifting of the data with respect to the clock. If SCTE is not available from the DTE, use no form of this command, which causes the DCE to use its own clock instead of SCTE from the DTE.

delay tens-of-microseconds
no delay

To set a delay value for an interface, use the delay interface configuration command. Use the no form of this command to restore the default delay value.

description string (controller)
no description

To add a description to an E1 or T1 controller interface on a Cisco 7000 series and Cisco 7500 series router, use the description controller configuration command. Use the no form of this command to remove the description.

description string (interface)
no description

To add a description to an interface configuration, use the description interface configuration command. Use the no form of this command to remove the description.

down-when-looped

To configure an interface to inform the system it is down when loopback is detected, use the down-when-looped interface configuration command.

[no] dte-invert-txc

On the Cisco 4000 platform, you can specify the serial Network Interface Module timing signal configuration. When the board is operating as a DTE, the dte-invert-txc command inverts the TXC clock signal it gets from the DCE that the DTE uses to transmit data. Use the no form of this command if the DCE accepts SCTE from the DTE.

[no] early-token-release

To enable early token release, use the early-token-release interface configuration command. Once enabled, use the no form of this command to disable this feature.

encapsulation encapsulation-type

To set the encapsulation method used by the interface, use the encapsulation interface configuration command.

[no] encapsulation atm-dxi

Use the encapsulation atm-dxi interface configuration command to enable ATM-DXI encapsulation. The no form of this command disables ATM-DXI encapsulation.

encapsulation lapb [dte | dce] [multi | protocol]

To set the LAPB encapsulation method used by the interface, use the encapsulation lapb interface configuration command.

encapsulation x25 [dte | dce] [ddn | bfe | ietf]

To specify an serial interface's operation as an X.25 device, use the encapsulation x25 interface configuration command.

error-threshold milliseconds

To set the mechanism that protects against packet overload and resulting recount errors on the MCI interface cards, use the error-threshold interface configuration command.

fddi burst-count number
no fddi burst-count

To allow the FCI card to preallocate buffers to handle bursty FDDI traffic (for example, NFS bursty traffic), use the fddi burst-count interface configuration command. Use the no form of this command to revert to the default value.

fddi c-min microseconds
no fddi c-min

To set the C-Min timer on the PCM, use the fddi c-min interface configuration command. Use the no form of this command to revert to the default value.

fddi cmt-signal-bits signal-bits [phy-a | phy-b]

To control the information transmitted during the connection management (CMT) signaling phase, use the fddi cmt-signal-bits interface configuration command.

[no] fddi duplicate-address-check

To turn on the duplicate address detection capability on the FDDI, use the fddi duplicate-address-check interface configuration command. Use the no form of this command to disable this feature.

[no] fddi encapsulate

To specify encapsulating bridge mode on the CSC-C2/FCIT interface card, use the fddi encapsulate interface configuration command. Use the no form of this command to turn off encapsulation bridging and return the FCIT interface to its translational, nonencapsulating mode.

[no] fddi smt-frames

To enable the SMT frame processing capability on the FDDI, use the fddi smt-frames interface configuration command. Use the no form of this command to disable this feature and prevent the Cisco IOS software from generating or responding to SMT frames.

fddi tb-min milliseconds
no fddi tb-min

To set the TB-Min timer in the physical connection management (PCM), use the fddi tb-min interface configuration command. Use the no form of this command to revert to the default value.

fddi tl-min-time microseconds

To control the TL-Min time (the minimum time to transmit a Physical Sublayer, or PHY line state, before advancing to the next physical connection management (PCM) state, as defined by the X3T9.5 specification), use the fddi tl-min-time interface configuration command.

fddi token-rotation-time microseconds

To control ring scheduling during normal operation and to detect and recover from serious ring error situations, use the fddi token-rotation-time interface configuration command.

fddi t-out milliseconds
no fddi t-out

To set the t-out timer in the physical connection management (PCM), use the fddi t-out interface configuration command. Use the no form of this command to revert to the default value.

fddi valid-transmission-time microseconds

To recover from a transient ring error, use the fddi valid-transmission-time interface configuration command.

framing {sf | esf} (for T1 lines)
framing {crc4 | no-crc4} [australia] (for E1 lines)

Use the framing controller configuration command to select the frame type for the T1 or E1 data line.

group-range low-end-of-range high-end-of-range
no group-number interface

To create a list of member asynchronous interfaces (associated with a group interface), use the group-range command. Use the no form of the command to remove an interface from the member list.

hold-queue length {in | out}
no hold-queue {in | out}

To specify the hold-queue limit of an interface, use the hold-queue interface configuration command. Use the no form of this command with the appropriate keyword to restore the default values for an interface.

[no] hssi external-loop-request

To allow the router to support a CSU/DSU that uses the LC signal to request a loopback from the router, use the hssi external-loop-request interface configuration command. Use the no form of this command to disable the feature.

[no] hssi internal-clock

To convert the HSSI interface into a 45 MHz clock master, use the hssi internal-clock interface configuration command. Use the no form of this command to disable the clock master mode.

hub ethernet number port [end-port]

To enable and configure a port on an Ethernet hub of a Cisco 2505 or Cisco 2507, use the hub global configuration command.

[no] ignore-dcd

Use the ignore-dcd interface configuration command to configure the serial interface to monitor the DSR signal (instead of the DCD signal) as the line up/down indicator. Use the no form of this command to restore the default behavior.

interface type number
interface type slot/port (for the Cisco 7000 family)
interface [type slot/port-adaptor/port] [ethernet | serial]  (for ports on VIP cards in the Cisco 7000 and the 7500 series routers)
interface serial slot/port:channel-group  (for channelized T1 or E1 on the Cisco 7000 series)
interface serial number:channel-group  (for channelized T1 or E1 on the Cisco 4000 series)

To configure an interface type and enter interface configuration mode, use the interface global configuration command.

interface type number.subinterface-number {multipoint | point-to-point}
interface type slot/port.subinterface-number {multipoint | point-to-point} (for the Cisco 7000 family)
interface type slot/port-adaptor.subinterface-number {multipoint | point-to-point}  (for the Cisco 7500 series)

To configure a subinterface, use one of the interface global configuration commands shown above.

interface dialer interface-number

To designate a dialer rotary group leader, use the interface dialer global configuration command..

[no] interface group-async unit-number

To create a group interface that will serve as master, to which asynchronous interfaces can be associated as members, use the interface group-async command. Use the no form of the command to restore the default.

[no] invert-transmit-clock

Delays between the SCTE clock and data transmission indicate that the transmit clock signal might not be appropriate for the interface rate and length of cable being used. Different ends of the wire may have variances that differ slightly. To invert the clock signal to compensate for these factors, use the invert-transmit-clock interface configuration command. This command applies only to the Cisco 7000 series and Cisco 7500 series. To return to the transmit clock signal to its initial state, use the no form of this command.

ip address-pool [dhcp-proxy-client | local]
no ip address-pool

To enable an address pooling mechanism used to supply IP addresses to dial-in asynchronous, synchronous, or ISDN point-to-point interfaces, use the ip address-pool global configuration command. To disable IP address pooling globally on all interfaces with the default configuration, use the no form of the command.

ip dhcp-server [ip-address | name]
no ip dhcp-server [ip-address | name]

To specify which Dynamic Host Configuration Protocol (DHCP) servers to use on your network, specify the IP address of one or more DHCP servers available on the network, use the ip dhcp-server global configuration command. Use the no form of the command to remove a DHCP server's IP address.

ip local-pool {default | poolname low-ip-address [high-ip-address]}
no ip local-pool {default | poolname}

To configure a local pool of IP addresses to be used when a remote peer connects to a point-to-point interface, use the ip local pool global configuration command. To delete an address pool, use the no form of this command.

[no] keepalive [seconds]

Use the keepalive interface configuration command to set the keepalive timer for a specific interface. The no form of this command turns off keepalives entirely.

lex burned-in-address ieee-address
no lex burned-in-address

To set the burned-in MAC address for a LAN Extender interface, use the lex burned-in-address interface configuration command. To clear the burned-in MAC address, use the no form of this command.

lex input-address-list access-list-number
no lex input-address-list

To assign an access list that filters on MAC addresses, use the lex input-address-list interface configuration command. To remove an access list from the interface, use the no form of this command.

lex input-type-list access-list-number
no lex input-type-list

To assign an access list that filters Ethernet packets by type code, use the lex input-type-list interface configuration command. To remove an access list from the interface, use the no form of this command.

lex priority-group group
no lex priority-group

To activate priority output queuing on the LAN Extender, use the lex priority-group interface configuration command. To disable priority output queuing, use the no form of this command.

lex retry-count number
no lex retry-count [number]

To define the number of times to resend commands to the LAN Extender, use the lex retry-count interface configuration command. To return to the default value, use the no form of this command.

lex timeout milliseconds
no lex timeout [milliseconds]

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.

linecode {ami | b8zs | hdb3}

Use the linecode controller configuration command to select the line-code type for the T1 or E1 line.

[no] link-test

To re-enable the link-test function on a port on an Ethernet hub of a Cisco 2505 or Cisco 2507, use the link-test hub configuration command. Disable this feature if a pre-10BaseT twisted-pair device not implementing link test is connected to the hub port with the no form of this command.

[no] local-lnm

To enable Lanoptics Hub Networking Management of a PCbus Token Ring interface, use the local-lnm interface configuration command. Use the no form of this command to disable Lanoptics Hub Networking Management.

[no] loopback (controller)

To loop an entire E1 line (including all channel-groups defined on the controller) toward the line and back toward the router or access server, use the loopback controller configuration command. To remove the loop, use the no form of this command.

[no] loopback (interface)

To diagnose equipment malfunctions between interface and device, use the loopback interface configuration command. Use the no loopback command to disable the test.

[no] loopback applique

To configure an internal loop on the HSSI applique, use the loopback interface configuration command. To remove the loop, use the no form of this command.

[no] loopback dte

To loop packets to DTE internally within the CSU/DSU at the DTE interface, when the device supports this feature, use the loopback interface configuration command. To remove the loop, use the no form of this command.

[no] loopback line

To loop packets completely through the CSU/DSU to configure the CSU loop, when the device supports this feature, use the loopback line interface configuration command. To remove the loop, use the no form of this command.

[no] loopback local (controller)

To loop an entire T1 line (including all channel-groups defined on the controller) toward the line and the router or access server, use the loopback local controller configuration command. To remove the loop, use the no form of this command.

[no] loopback local (interface)

To loop a channelized T1 or channelized E1 channel-group, use the loopback local interface configuration command. To remove the loop, use the no form of this command.

[no] loopback remote (controller)

To loop packets from a MIP through the CSU/DSU, over a dedicated T1 link, to the remote CSU at the single destination for this T1 link and back, use the loopback remote controller configuration command. To remove the loop, use the no form of this command.

[no] loopback remote (interface)

To loop packets through a CSU/DSU, over a DS-3 link or a channelized T1 link, to the remote CSU/DSU and back, use the loopback remote interface configuration command. To remove the loop, use the no form of this command.

[no] media-type [aui | 10baset]

To specify the Ethernet Network Interface Module configuration on the Cisco 4000 series, use the media-type interface configuration command. To remove a previous media-type specification for the Ethernet interface, use the no form of this command.

[no] member number interface-command

To alter the configuration of an asynchronous interface that is a member of a group, use the member interface configuration command. Use the no form of the command to restore defaults set at the group master interface.

[no] mop enabled

To enable an interface to support the Maintenance Operation Protocol (MOP), use the mop enabled interface configuration command. To disable MOP on an interface, use the no mop enabled command.

[no] mop sysid

To enable an interface to send out periodic Maintenance Operation Protocol (MOP) system identification messages, use the mop sysid interface configuration command. To disable MOP message support on an interface, use the no form of this command.

mtu bytes
no mtu

To adjust the maximum packet size or maximum transmission unit (MTU) size, use the mtu interface configuration command. Use the no form of this command to restore the MTU value to its original default value.

[no] nrzi-encoding

To enable non-return to zero inverted (NRZI) line coding format, use the nrzi-encoding interface configuration command. Use the no form of this command to disable this capability.

peer default ip address {ip-address | dhcp | pool [poolname]}
no peer default ip address

Use the peer default ip address command to specify an IP address, an address from a specific IP address pool, or an address from the DHCP mechanism to be returned to a remote peer connecting to this interface. Use the no form of the command to disable a prior peer IP address pooling configuration on an interface.

ppp authentication {chap | pap} [if-needed] [listname]
no ppp authentication

To enable Challenge Handshake Authentication Protocol (CHAP) or Password Authentication Protocol (PAP), and a TACACS+ authorization method on a serial interface, use the ppp authentication interface configuration command. Use the no form of the command to disable this authentication.

ppp quality percentage
no ppp quality

To enable Link Quality Monitoring (LQM) on a serial interface, use the ppp quality interface configuration command. Use the no form of this command to disable LQM.

pri-group [timeslots range]
no pri-group

To specify ISDN Primary Rate Interface (PRI) on a channelized E1 or T1 card on the Cisco 7000 series, use the pri-group controller configuration command. Use the no form of this command to remove the ISDN PRI.

pulse-time seconds
no pulse-time

To enable pulsing DTR signal intervals on the serial interfaces, use the pulse-time interface configuration command. Use the no form of this command to restore the default interval.

ring-speed speed

To set the ring speed for the CSC-1R and CSC-2R Token Ring interfaces, use the ring-speed interface configuration command.

scheduler-interval milliseconds
no scheduler-interval

To control the maximum amount of time that can elapse without running the lowest priority system processes, use the scheduler-interval global configuration command. Use the no form of this command to restore the default.

show async status

To list the status of the asynchronous interfaces (which on routers is interface 1, the auxiliary port), use the show async status user EXEC command:

show compress

To display compression statistics, use the show compress EXEC command.

show controllers cbus

Use the show controllers cbus privileged EXEC command on the AGS+ to display all information under the ciscoBus controller card. This command also shows the capabilities of the card and reports controller-related failures.

show controllers cxbus

Use the show controllers cxbus privileged EXEC command to display information about the Switch Processor (SP) CxBus controller on the Cisco 7000 series and 7500 series. This command displays information that is specific to the interface hardware. The information displayed is generally useful for diagnostic tasks performed by technical support personnel only.

show controllers e1 [slot/port]

Use the show controllers e1 privileged EXEC command on the Cisco 4000, Cisco 7000, and Cisco 7500 series to display information about the E1 links supported by the Network Processor Module (NPM) (Cisco 4000) or MultiChannel Interface Processor (MIP) (Cisco 7000 series and Cisco 7500 series).

show controllers ethernet number

Use the show controllers ethernet EXEC command to display information on the Cisco 2500, Cisco3000, or Cisco 4000.

show controllers fddi

Use the show controllers fddi user EXEC command to display all information under the FDDI controller card on the AGS+ or FDDI Interface Processor (FIP) on the Cisco 7000 series and Cisco 7500 series.

show controllers lex [number]
show controllers lex [slot/port] (for the Cisco 7000 family)

To show hardware and software information about the LAN Extender chassis, use the show controllers lex EXEC command.

show controllers mci

Use the show controllers mci privileged EXEC command to display all information under the Multiport Communications Interface card or the SCI.

show controllers pcbus

To display all information about the ISA bus interface, use the show controllers pcbus privileged EXEC command.

show controllers serial

Use the show controllers serial privileged EXEC command to display information that is specific to the interface hardware.

show controller t1 [slot/port]

Use the show controller t1 privileged EXEC command on the Cisco 4000 or Cisco 7000 series and Cisco 7500 series to display information about the T1 links supported by the Network Processor Module (NPM) (Cisco 4000) or the Multichannel Interface Processor (MIP) (Cisco 7000).

show controllers token

To display information about memory management and error counters, and about the CSC-R, CSC-1R, CSC-2R, C2CTR, and CSC-R16 (or CSC-R16M) Token Ring interface cards or Token Ring Interface Processor (TRIP) in the case of the Cisco 7000 series and Cisco 7500 series, use the show controllers token privileged EXEC command.

show dhcp [interface number]

Use the show dhcp command to display the current DHCP settings on the access server's asynchronous interfaces.

show hub [ethernet number [port [end-port]]]

To display information about the hub (repeater) on an Ethernet interface of a Cisco 2505 or Cisco 2507, use the show hub EXEC command.

show interfaces [type number ] [first] [last] [accounting]
show interfaces [type slot/port] [accounting]  (for the Cisco 7000 family)
show interface [type slot/port-adaptor/port] [ethernet | serial]  (for ports on VIP cards in the Cisco 7000 and the 7500 series routers)

Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. The resulting output varies, depending on the network for which an interface has been configured.

show interfaces async [number] [accounting]

Use the show interfaces async privileged EXEC command to display information about the serial interface.

show interfaces atm [slot/port]

Use the show interfaces atm privileged EXEC command to display information about the ATM interface.

show interfaces dialer unit [accounting]

Use the show interfaces dialer EXEC command to display information about the dialer interface.

show interfaces ethernet unit [accounting]
show interfaces ethernet [slot/port] [accounting]  (for the Cisco 7000 series)
show interfaces ethernet [type slot/port-adaptor/port] [ethernet | serial]  (for ports on VIP cards in the Cisco 7000 and the 7500 series routers)

Use the show interfaces ethernet privileged EXEC command to display information about an Ethernet interface on the router.

show interfaces fddi number [accounting]
show interfaces fddi [slot/port] [accounting] (for the Cisco 7000 series and Cisco 7500 series)

Use the show interfaces fddi EXEC command to display information about the FDDI interface.

show interfaces hssi number [accounting]
show interfaces hssi [slot/port] [accounting] (for the Cisco 7000 series)

Use the show interfaces hssi privileged EXEC command to display information about the HSSI interface.

show interfaces ip-brief

To list a brief summary of an IP interface's information and status, use the show interfaces ip-brief EXEC command.

show interfaces lex number [ethernet | serial]

To display statistics about a LAN Extender interface, use the show interface lex EXEC command.

show interfaces loopback [number] [accounting]

Use the show interfaces loopback privileged EXEC command to display information about the loopback interface.

show interfaces serial [number] [accounting]
show interfaces serial [number[:channel-group ] [accounting]  (for the Cisco 4000 series)
show interfaces serial [slot/port [:channel-group ]][accounting]  (for the Cisco 7000 series)
show interfaces serial [type slot/port-adaptor/port] [serial]  (for ports on VIP cards in the
Cisco 7000 and Cisco 7500 series routers)

Use the show interfaces serial privileged EXEC command to display information about a serial interface.

show interfaces tokenring unit [accounting]
show interfaces tokenring slot/port [accounting]  (for the Cisco 7000 series)
show interfaces tokenring [type slot/port-adaptor/port] [token ring| serial]  (for ports on VIP cards in the Cisco 7000 and Cisco 7500 series routers)

Use the show interfaces tokenring privileged EXEC command to display information about the Token Ring interface and the state of source route bridging.

show interfaces tunnel number [accounting]

To list tunnel interface information, use the show interfaces tunnel privileged EXEC command.

show interfaces vty number

Use the show interfaces vty EXEC command to display information about virtual asynchronous interfaces.

show ip interface [brief] [type] [number]

To list a summary of an interface's IP information and status, use the show ip interface privileged EXEC command.

show ip local pool [name]

To display statistics for any defined IP address pools, use the show ip local pool command.

show rif

Use the show rif EXEC command to display the current contents of the RIF cache.

[no] shutdown (hub configuration)

To shut down a port on an Ethernet hub of a Cisco 2505 or Cisco 2507, use the shutdown hub configuration command. To restart the disabled hub, use the no form of this command.

[no] shutdown (interface)

To disable an interface, use the shutdown interface configuration command. To restart a disabled interface, use the no form of this command.

smt-queue-threshold number
no smt-queue-threshold

To set the maximum number of unprocessed FDDI station management (SMT) frames that will be held for processing, use the smt-queue-threshold global configuration command. Use the no form of this command to restore the queue to the default.

[no] snmp trap illegal-address

To issue an SNMP trap when a MAC address violation is detected on an Ethernet hub port of a Cisco 2505, Cisco 2507, or Cisco 2516 router, use the snmp trap illegal-address hub configuration command. Use the no form to disable this function.

source-address [mac-address]
no source-address

To configure source address control on a port on an Ethernet hub of a Cisco 2505 or Cisco 2507, use the source-address hub configuration command. To remove a previously defined source address, use the no form of this command.

[no] squelch {normal | reduced}

To extend the Ethernet twisted-pair 10BaseT capability beyond the standard 100 meters on the Cisco 4000 platform, use the squelch interface configuration command. To restore the default, use the no form of this command.

timeslot start-slot - stop-slot
no timeslot

To enable framed mode on a G.703-E1 interface, use the timeslot interface configuration command. To restore the default, use the no form of this command or set the start-slot to 0.

[no] transmit-clock-internal

When a DTE does not return a transmit clock, use the transmit-clock-internal interface command to enable the internally generated clock on a serial interface on a Cisco 7000 series and Cisco 7500 series. Use the no form of this command to disable the feature.

transmitter-delay {microseconds | hdlc-flags}
no transmitter-delay

To specify a minimum dead-time after transmitting a packet, use the transmitter-delay interface configuration command. The no form of this command restores the default.

[no] ts16

To control the use of time slot 16 for data on a G.703-E1 interface, use the ts16 interface configuration command. To restore the default, use the no form of this command.

[no] tunnel checksum

To enable encapsulator-to-decapsulator checksumming of packets on a tunnel interface, use the tunnel checksum interface configuration command. To disable checksumming, use the no form of this command.

tunnel destination {hostname | ip-address}
no tunnel destination

To specify a tunnel interface's destination, use the tunnel destination interface configuration command. To remove the destination, use the no form of this command.

tunnel key key-number
no tunnel key

To enable an ID key for a tunnel interface, use the tunnel key interface configuration command. To remove the ID key, use the no form of this command.

tunnel mode {aurp | cayman | dvmrp | eon | gre ip | nos}
no tunnel mode

To set the encapsulation mode for the tunnel interface, use the tunnel mode interface configuration command. To set to the default, use the no form of this command.

[no] tunnel sequence-datagrams

To configure a tunnel interface to drop datagrams that arrive out of order, use the tunnel sequence-datagrams interface configuration command. To disable this function, use the no form of this command.

tunnel source {ip-address | type number}
no tunnel source

To set a tunnel interface's source address, use the tunnel source interface configuration command. To remove the source address, use the no form of this command.

tx-queue-limit number

To control the number of transmit buffers available to a specified interface on the MCI and SCI cards, use the tx-queue-limit interface configuration command.