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This chapter describes the function and displays the syntax of each interface command. For more information about defaults and usage guidelines, see the corresponding chapter of the Router Products Command Reference publication.
Use the access-list global configuration command to establish MAC address access lists. Use the no form of this command to remove a single access list entry.
| access-list-number | Integer from 700 to 799 that you select for the list. |
| permit | Permits the frame. |
| deny | Denies the frame. |
| address mask | 48-bit MAC addresses written in dotted triplet form. The ones bits in the mask argument are the bits to be ignored in address. |
Use the access-list global configuration command to build type-code access lists. Use the no form of this command to remove a single access list entry.
| access-list-number | User-selectable number between 200 and 299 that identifies the list. |
| permit | Permits the frame. |
| deny | Denies the frame. |
| type-code | 16-bit hexadecimal number written with a leading "0x"; for example, 0x6000. You can specify either an Ethernet type code for Ethernet-encapsulated packets, or a DSAP/SSAP pair for 802.3 or 802.5-encapsulated packets. Ethernet type codes are listed in the "Ethernet Type Codes" appendix of the Router Products Command Reference publication. |
| wild-mask | 16-bit hexadecimal number whose ones bits correspond to bits in the type-code argument that should be ignored when making a comparison. (A mask for a DSAP/SSAP pair should always be at least 0x0101. This is because these two bits are used for purposes other than identifying the SAP codes.) |
To assign the interface address that is used by the device connecting to the router via PPP or SLIP, unless you override the address at the command line, use the async default ip address interface configuration command. Use the no form of the command to remove the address from your configuration.
| ip-address | Address of the client interface. |
To specify an address on an asynchronous interface (rather than using the default address), use the async dynamic address interface configuration command. Use the no form of this command to disable dynamic addressing.
To implement asynchronous routing on an interface, use the async dynamic routing interface configuration command. The no form of this command disables use of routing protocols; static routing will still be used.
To place a line into network mode using SLIP or PPP encapsulation, use the async mode dedicated interface configuration command. The no form of this command returns the line to interactive mode.
To enable the slip and ppp EXEC commands, use the async mode interactive line configuration command. Use the no form of this command to prevent users from implementing SLIP and PPP at the EXEC level.
To enable automatic receiver polarity reversal on a hub port connected to an Ethernet interface of a Cisco 2505 or Cisco 2507, use the auto-polarity hub configuration command. To disable this feature, use the no form of this command.
To define how much time should elapse before a secondary line is set up or taken down after a primary line transition, use the backup delay interface configuration command. Use the no form of this command to remove the definition.
| enable-delay | Integer that specifies the delay in seconds after the primary line goes down before the secondary line is activated. |
| never | Prevents the secondary line from being activated. |
| disable-delay | Integer that specifies the delay in seconds after the primary line goes up before the secondary line is deactivated. |
| never | Prevents the secondary line from being deactivated. |
To configure the serial interface as a secondary, or dial backup line, use the backup interface serial interface configuration command. Use the no form of this command with the appropriate serial port designation to turn disable this feature.
| number | Number of the serial port to be set as the secondary, or dial backup, interface line. |
| slot | On the Cisco 7000 series, specifies the slot number. |
| port | On the Cisco 7000 series, specifies the port number. |
To set the traffic load thresholds for dial backup service, use the backup load interface configuration command. Use the no form of this command to remove the setting.
| enable-threshold | Integer that specifies a percentage of the primary line's available bandwidth. |
| never | Sets the secondary line to never be activated due to load. |
| disable-load | Integer that specifies a percentage of the primary line's available bandwidth. |
| never | Sets the secondary line to never be deactivated due to load. |
To set a bandwidth value for an interface, use the bandwidth interface configuration command. Use the no form of this command to restore the default values.
| kilobits | Intended bandwidth in kilobits per second. For a full bandwidth DS3, enter the value 44736. |
Use the channel-group controller configuration command to define the timeslots that belong to each T1 or E1 circuit.
| number | Channel-group number. When configuring a T1 data line, channel-group numbers can be a value from 0 to 23. When configuring an E1 data line, channel-group numbers can be a value from 0 to 30. |
| timeslots range | Timeslot or range of timeslots belonging to the channel-group. The first timeslot is numbered 1. For a T1 controller, the timeslot range is from 1 to 24. For an E1 controller, the timeslot range is from 1 to 31. |
| speed {48 | 56 | 64} | (Optional) Specifies the line speed (in kilobits per second) of the T1 or E1 link. Default is 56 for T1 and is 64 for E1. |
Use the clear controller EXEC command to reset the T1 or E1 controller interface on the Cisco 7000 series or Cisco 4000 series routers.
| slot | Backplane slot number; can be 0, 1, 2, 3, or 4. The slots are numbered from left to right. |
| port | Port number of the interface. It can be 0 or 1 on the MIP (MultiChannel Interface Processor). Ports on each interface processor are numbered from the top down. |
| number | Network interface module (NIM) number, in the range 0 through 2. |
To reboot the LAN Extender and restart its operating software, use the clear controller lex privileged EXEC command.
| number | Number of the LAN Extender interface corresponding to the LAN Extender to be rebooted. |
| prom | (Optional) Forces a reload of the PROM image, regardless of any Flash image. |
| slot | On the Cisco 7000 series, specifies the backplane slot number. On the Cisco 7000, the value can be 0, 1, 2, 3, or 4. On the Cisco 7010, the value can be 0, 1, or 2. |
| port | On the Cisco 7000 series, specifies the port number of the interface. The value can be 0, 1, 2, or 3 for the serial interface. |
To clear the interface counters, use the clear counters EXEC command.
| type | (Optional) Specifies the interface type. See this command in the Router Products Command Reference publication for a list of supported values. |
| number | (Optional) Specifies the interface counter displayed with the show interfaces command. |
| ethernet | (Optional) If the type is lex, you can clear the interface counters on the Ethernet interface. |
| serial | (Optional) If the type is lex, you can clear the interface counters on the serial interface. |
| slot | (Optional) On the Cisco 7000 series, specifies the backplane slot number. On the 7000, value can be 0, 1, 2, 3, or 4. On the 7010, value can be 0, 1, or 2. |
| port | (Optional) On the Cisco 7000 series, specifies the port number of the interface. Value can be 0, 1, 2, or 3 for the serial interface. |
To reset and reinitialize the hub hardware connected to an interface of a Cisco 2505 or Cisco 2507, use the clear hub EXEC command.
| ethernet | Indicates the hub in front of an Ethernet interface. |
| number | Hub number to clear, starting with 0. Since there is currently only one hub, this number is 0. |
To set to zero the hub counters on an interface of a Cisco 2505 or Cisco 2507, use the clear hub counters EXEC command.
| ether | (Optional) Indicates the hub in front of an Ethernet interface. |
| number | (Optional) Hub number for which to clear counters. Since there is currently only one hub, this number is 0. If the keyword ether is specified, the number is required. |
| port | (Optional) Port number on the hub. On the Cisco 2505, port numbers range from 1 through 8. On the Cisco 2507, port numbers range from 1 through 16. If a second port number follows, then this port number indicates the beginning of a port range. If no port number is specified, counters for all ports are cleared. |
| end-port | (Optional) Ending port number of a range. |
To reset the hardware logic on an interface, use the clear interface EXEC command.
| type | Specifies the interface type. See this command in the Router Products Command Reference publication for a list of supported values. |
| number | Specifies the port, connector, or interface card number. |
| slot | In a Cisco 7000, specifies the backplane slot number and can be 0, 1, 2, 3, or 4. In a Cisco 7010, the value can be 0, 1, or 2. |
| port | On a Cisco 7000 series, specifies the port number of the interface and can be 0, 1, 2, 3, 4 or 5 depending on the type of interface, as follows: AIP (ATM Interface Processor)---0 EIP (Ethernet Interface Processor)---0, 1, 2, 3, 4, or 5 FIP (FDDI Interface Processor)---0 HIP (HSSI Interface Processor)---0 MIP (Multichannel Interface Processor) 0 or 1 TRIP (Token Ring Interface Processor)---0, 1, 2, or 3 |
| :channel-group | (Optional) On the Cisco 7000 series supporting channelized T1, specifies the channel in the range of 0 to 23. |
To clear entries from the Routing Information Field (RIF) cache, use the clear rif-cache EXEC command.
To configure the clock rate for appliques (connector hardware) on the serial interface of the MCI and SCI cards to an acceptable bit rate, use the clock rate interface configuration command. Use the no form of this command to remove the clock rate if you change the interface from a DCE to a DTE device.
| bps | Desired clock rate in bits per second: 1200, 2400, 4800, 9600, 19200, 34800, 56000, 64000, 72000, 125000, 148000, 500000, 800000, 1000000, 1300000, 2000000, or 4000000. |
Use the clock source controller configuration command to set the T1line clock-source for the MIP in the Cisco 7000 series.
| line | Specifies the T1 line as the clock source. |
| internal | Specifies the MIP as the clock source. |
To control which clock a G.703-E1 interface will use to clock its transmitted data from, use the clock source interface configuration command. The no form of this command restores the default value.
| line | Specifies that the interface will clock its transmitted data from a clock recovered from the line's receive data stream (default). |
| internal | Specifies that the interface will clock its transmitted data from its internal clock. |
To start the processes that perform the connection management (CMT) function and allow the ring on one fiber to be started, use the cmt connect EXEC command.
| interface-name | (Optional) Specifies the FDDI interface. |
| phy-a | (Optional) Selects Physical Sublayer A. |
| phy-b | (Optional) Selects Physical Sublayer B. |
To stop the processes that perform the connection management (CMT) function and allow the ring on one fiber to be stopped, use the cmt disconnect EXEC command.
| interface-name | (Optional) Specifies the FDDI interface. |
| phy-a | (Optional) Selects Physical Sublayer A. |
| phy-b | (Optional) Selects Physical Sublayer B. |
To configure point-to-point software compression for LAPB, HDLC, or PPP, use the compress interface configuration command. To disable compression, use the no form of this command.
| predictor | (Optional) Specifies that a predictor compression algorithm will be used on LAPB and PPP encapsulation. |
| stac | (Optional) Specifies that a Stacker (LZS) compression algorithm will be used on HDLC and PPP encapsulation. |
To configure a T1 or E1 controller and enter controller configuration mode, use the controller global configuration command.
| t1 | T1 controller. |
| e1 | E1 controller. |
| slot | Backplane slot number; can be 0, 1, 2, 3, or 4. On the 7010, the slot number can be 0, 1, or 2. The slots are numbered from left to right. |
| port | Port number of the interface. It can be 0 or 1 for the MIP (MultiChannel Interface Processor). Ports on each interface processor are numbered from the top down. |
| number | Network interface module (NIM) number, in the range 0 through 2. |
To download an executable image from Flash memory on the core router to the LAN Extender, use the copy flash lex privileged EXEC command.
| number | Number of the LAN Extender interface to which to download an image from Flash. |
To download an executable image from a TFTP server to the LAN Extender, use the copy tftp lex privileged EXEC command.
| number | Number of the LAN Extender interface to which to download an image. |
To set the length of the cyclic redundancy check (CRC) on a Fast Serial Interface Processor (FSIP) of the Cisco 7000 series, use the crc interface configuration command. To set the CRC length to 16 bits, use the no form of this command.
| size | CRC size (16 or 32 bits); the default is 16 bits. |
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.
When running a 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 the no form of this command, which causes the DCE to use its own clock instead of SCTE from the DTE.
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.
| tens-of-microseconds | Integer that specifies the delay in tens of microseconds for an interface or network segment. |
To add a description to a T1 or E1 controller on a Cisco 7000 series router, use the description controller configuration command. Use the no form of this command to remove the description.
| string | Comment or a description to help you remember what is attached to the interface. |
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.
| string | Comment or a description to help you remember what is attached to this interface. |
To configure an interface to inform the system it is down when loopback is detected, use the down-when-looped interface configuration command.
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.
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.
To set the encapsulation method used by the interface, use the encapsulation interface configuration command.
| encapsulation-type | Encapsulation type. See this command in the Router Products Command Reference publication for a list of supported values. |
Use the encapsulation atm-dxi interface configuration command to enable ATM-DXI encapsulation. The no form of this command disables ATM-DXI encapsulation.
To set the LAPB encapsulation method used by the interface, use the encapsulation lapb interface configuration command.
| dte | (Optional) DDN X.25 DTE operation (for serial interface). |
| dce | (Optional) DDN X.25 DCE operation (for serial interface). |
| multi | (Optional) Multi-protocol support. |
| protocol | (Optional) Protocol type. See this command in the Router Products Command Reference publication for a list of supported values. |
To specify an serial interface's operation as an X.25 device, use the encapsulation x25 interface configuration command.
| dce | (Optional) DDN X.25 DCE operation (for serial interface). |
| dte | (Optional) DDN X.25 DTE operation (for serial interface). |
| bfe | (Optional) Blacker Front End attachment encapsulation. |
| ddn | (Optional) Defense Data Network attachment encapsulation. |
| ietf | (Optional) IETF RFC-1356 encapsulation. |
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.
| number | Number of preallocated buffers. Valid values are in the range from 1 to 10; the default is 3 buffers. |
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.
| microseconds | Sets the timer value in microseconds. The default is 1600 microseconds. |
To control the information transmitted during the connection management (CMT) signaling phase, use the fddi cmt-signal-bits interface configuration command. If neither the phy-a nor phy-b keyword is specified, the signal bits apply to both physical connections.
| signal-bits | A hexadecimal number preceded by 0x; for example, 0x208. The FDDI standard defines ten bits of signaling information that must be transmitted, as follows: bit 0---Escape bit. Reserved for future assignment by the FDDI standards committee.bits 1 and 2---Physical type.bit 3---Physical compatibility. Set if topology rules include the connection of a physical-to-physical type at the end of the connection.bits 4 and 5---Link Confidence test duration.bit 6---Media Access Control (MAC) available for link confidence test.bit 7---Link confidence test failed. The setting of bit 7 indicates that the link confidence was failed by the Cisco end of the connection.bit 8---MAC for local loop.bit 9---MAC on physical output. For more information about setting these values, see this command in the Router Products Command Reference publication. |
| phy-a | (Optional) Selects Physical Sublayer A. |
| phy-b | (Optional) Selects Physical Sublayer B. |
To enable 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.
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.
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, in which case the router will not generate or respond to SMT frames.
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.
| milliseconds | Sets the TM-Min timer value in milliseconds. The default is 100 milliseconds. |
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.
| microseconds | Integer that specifies the time used during the connection management (CMT) phase to ensure that signals are maintained for at least the value of TL-Min so the remote station can acquire the signal. The default is 30 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.
| microseconds | Integer that specifies the token rotation time (TRT). The default is 5000 microseconds. |
To set the timeout 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.
| milliseconds | Sets the timeout timer. The default is 100 milliseconds. |
To recover from a transient ring error, use the fddi valid-transmission-time interface configuration command.
| microseconds | Integer that specifies the transmission valid timer (TVX) interval. The default is 2500 microseconds. |
Use the framing controller configuration command to select the frame type for the T1 or E1 data line.
| sf | Specifies super frame as the T1 frame type; this is the default on a T1 line. |
| esf | Specifies extended super frame as the T1 frame type. |
| crc4 | Specifies CRC4 frame as the E1 frame type; this is the default on an E1 line. |
| no-crc4 | Specifies no CRC4 frame as the E1 frame type. |
| australia | (Optional) Specifies the E1 frame type used in Australia. |
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.
| length | Integer that specifies the maximum number of packets in the queue. Default input hold-queue limit is 75 packets. Default output hold-queue limit is 40 packets. |
| in | Specifies the input queue. |
| out | Specifies the output queue. |
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.
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.
To enable and configure a port on an Ethernet hub of a Cisco 2505 or Cisco 2507, use the hub global configuration command.
| ethernet | Indicates that the hub is in front of an Ethernet interface. |
| number | Hub number, starting with 0. Since there is currently only one hub, this number is 0. |
| port | Port number on the hub. On the Cisco 2505, port numbers range from 1 through 8. On the Cisco 2507, port numbers range from 1 through 16. If a second port number follows, then the first port number indicates the beginning of a port range. |
| end-port | (Optional) Last port number of a range. |
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.
To configure an interface type and enter interface configuration mode, use one of the interface global configuration command shown above. The keywords and arguments are defined on the next page.
interface type number.subinterface-number [multipoint |
point-to-point]
interface type slot/port.subinterface-number [multipoint |
point-to-point] (for the Cisco 7000 series)
To configure a subinterface, use one of the interface global configuration commands shown on the preceding page.
| type | Type of interface to be configured. See this command in the Router Products Command Reference publication for a list of supported values. |
| number | Port, connector, or interface card number. The numbers are assigned at the factory at the time of installation or when added to a system, and can be displayed with the show interfaces command. |
| slot | On the Cisco 7000 series, specifies the backplane slot number; can be 0, 1, 2, 3, or 4 on the Cisco 7000. On the Cisco 7010, can be 0, 1, or 2. The slots are numbered from left to right. |
| port | On the Cisco 7000 series, specifies the port number of the interface. It can be 0, 1, 2, 3, 4, or 5 depending on the type of interface, as follows: · AIP (ATM Interface Processor)---0 · EIP (Ethernet Interface Processor)---0, 1, 2, 3, 4, or 5 · FIP (FDDI Interface Processor)---0 · FSIP (Fast Serial Interface Processor)---0, 1, 2, or 3 · HIP (HSSI Interface Processor)---0 · MIP (MultiChannel Interface Processor) 0 or 1 · TRIP (Token Ring Interface Processor)---0, 1, 2, or 3 Ports on each interface processor are numbered from the top down. |
| channel-group | On the Cisco 7000, specifies the T1 circuit number in the range of 0 to 23 defined with the channel-group controller configuration command. |
| .subinterface-number | Subinterface number in the range 1 to 4294967293. The number that precedes the period (.) must match the number this subinterface belongs to. |
| multipoint | point-to-point | (Optional) Specifies a multipoint or point-to-point subinterface. The default is multipoint. |
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 to the Cisco 7000 series. To return to the transmit clock signal to its initial state, use the no form of this command.
To make temporary IP addresses available for dial-in asynchronous clients using Serial Line Internet Protocol (SLIP)/PPP, use the ip address-pool global configuration command. Use the no form of the command to disable IP address pooling on all interfaces.
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 by using the ip dhcp-server global configuration command. Use the no form of the command to remove a DHCP server's IP address.
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.
| seconds | (Optional) Unsigned integer value greater than 0. The default is 10 seconds. |
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.
| ieee-address | 48-bit IEEE MAC address written as a dotted triplet of four-digit hexadecimal numbers |
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.
| access-list-number | Number of the access list you assigned with the accesslist global configuration command. It can be a number from 700 to 799. |
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.
| access-list-number | Number of the access list you assigned with the access-list global configuration command. It can be a number in the range 200 to 299. |
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.
| 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, use the lex retry-count interface configuration command. To return to the default value, use the no form of this command.
| 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 times. |
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.
| 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 milliseconds (2 seconds). |
Use the linecode controller configuration command to select the line-code type for the T1 or E1 line.
| 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 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.
To enable Lanoptics Hub Networking Management of a PCbus Token Ring interface, use the local-lnm command. Use the no form of this command to disable management.
To loop an entire E1 line (including all channel-groups defined on the controller) toward the line and back toward the router, use the loopback controller configuration command. To remove the loop, use the no form of this command.
To diagnose equipment malfunctions between interface and device, use the loopback interface configuration command. The no loopback command disables the test.
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.
To loop packets to DTE internally within the CSU/DSU at the DTE interface, when the device supports this feature, use the loopback dte interface configuration command. To remove the loop, use the no form of this command.
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.
To loop an entire T1 line (including all channel-groups defined on the controller) toward the line and back toward the router, use the loopback local controller configuration command. To remove the loop, use the no form of this command.
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.
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.
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.
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.
| aui | (Optional) Selects a 15-pin physical connection. |
| 10baset | (Optional) Selects an RJ45 10BaseT physical connection. |
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 form of this command.
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.
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.
| bytes | Desired size in bytes. |
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.
You can selectively disable DHCP proxy-client status on an individual asynchronous interface on a router by using the no peer default ip address pool interface configuration command. You can turn a single interface back on by issuing the standard command after it is turned off.
To enable Challenge Handshake Authentication Protocol (CHAP) or Password Authentication Protocol (PAP), and to enable 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.
| chap | Enables CHAP on a serial interface. |
| pap | Enables PAP on a serial interface. |
| if-needed | (Optional) Used with TACACS and XTACACS. Do not perform CHAP or PAP authentication if the user has already provided authentication. This option is available only on asynchronous interfaces. |
| list-name | (Optional) Used with AAA/TACACS+. Specify the name of a list of TACACS+ methods of authentication to use. If no listname is specified, the system uses the default. Lists and default are created with the aaa authentication ppp command. |
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.
| percentage | Specifies the link quality threshold. Range is 1 to 100. |
To specify ISDN Primary Rate Interface (PRI) on a channelized 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.
| timeslots range | (Optional) Specifies a single range of values from 1 to 23. |
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.
| seconds | Integer that specifies the DTR signal interval in seconds. The default is 0 seconds. |
To set the ring speed for the CSC-1R, CSC-2R, and IGS/TR Token Ring interfaces, use the ring-speed interface configuration command.
| speed | Integer that specifies the ring speed, either 4 for 4Mbps or 16 for 16Mbps operation. The default is 16Mbps operation. |
To list the status of the asynchronous interface 1 associated with the router auxiliary port, use the show async status user EXEC command.
To display compression statistics, use the show compress EXEC command.
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.
Use the show controllers cxbus privileged EXEC command to display information about the switch processor (SP) CxBus controller on the Cisco 7000 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.
Use the show controllers e1 privileged EXEC command on the Cisco 4000 or Cisco 7000 to display information about the E1 links supported by the Network Processor Module (NPM) (Cisco 4000) or MultiChannel Interface Processor (MIP) (Cisco 7000).
| slot | Specifies the backplane slot number and can be 0, 1, 2, 3, or 4. |
| port | Specifies the port number of the controller and can be 0 or 1. |
Use the show controllers ethernet EXEC command to display information on the Cisco 2500, Cisco 3000, or Cisco 4000.
| interface-number | Interface number of the Ethernet interface. |
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.
To show hardware and software information about the LAN Extender, use the show controllers lex EXEC command.
| number | (Optional) Number of the LAN Extender interface about which to display information. |
| slot | (Optional) Specifies the backplane slot number on the Cisco 7000 series, and can be 0, 1, 2, 3, or 4. |
| port | (Optional) Specifies the port number of the controller and can be 0 or 1. |
Use the show controllers mci privileged EXEC command to display all information under the Multiport Communications Interface card or the SCI.
To display all information about the ISA bus interface, use the show controllers pcbus privileged EXEC command.
Use the show controllers serial privileged EXEC command to display information specific to the interface hardware.
Use the show controller t1 privileged EXEC command on the Cisco 4000 or Cisco 7000 to display information about the T1 links supported by the Network Processor Module (NPM) (Cisco 4000) or the Multichannel Interface Processor (MIP) (Cisco 7000).
| slot | (Optional) Specifies the backplane slot number and can be 0, 1, 2, 3, or 4. |
| port | (Optional) Specifies the port number of the controller and can be 0 or 1. |
Use the show controllers token privileged EXEC command 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.
To display information about the hub on an Ethernet interface of a Cisco 2505 or Cisco 2507, use the show hub EXEC command.
| ethernet | (Optional) Indicates that this is an Ethernet hub. |
| number | (Optional) Hub number, starting with 0. Since there is currently only one hub, this number is 0. |
| port | (Optional) Port number on the hub. On the Cisco 2505, port numbers range from 1 through 8. On the Cisco 2507, port numbers range from 1 through 16. If a second port number follows, then this port number indicates the beginning of a port range. |
| end-port | (Optional) Ending port number of a range. |
Use the show interfaces EXEC command to display statistics for all interfaces configured on the router. The resulting output varies, depending on the network for which an interface has been configured.
| type | (Optional) Interface type. Allowed values for type include async, bri0, ethernet, fddi, hssi, loopback, null, serial, tokenring, and tunnel. For the Cisco 7000 series, type can be atm, ethernet, fddi, serial, or tokenring. |
| number | Port number on the selected interface controller. |
| first last | (Optional) For the Cisco 2500 and 3000 ISDN Basic Rate Interface (BRI) only. The argument first can be either 1 or 2. The argument last can only be 2, indicating B-channels 1 and 2. D-channel information is obtained by using the command without the optional arguments. |
| accounting | (Optional) Displays the number of packets of each protocol type that has been sent through the interface. |
| slot | Specifies the backplane slot number and can be 0, 1, 2, 3, or 4. |
| port | Specifies the port number of the interface and can be 0, 1, 2, 3, 4, or 5 depending on the type of interface, as follows: AIP (ATM Interface Processor)---0 EIP (Ethernet Interface Processor)---0, 1, 2, 3, 4, or 5 FIP (FDDI Interface Processor)---0 FSIP (Fast Serial Interface Processor)---0, 1, 2, or 3 HIP (HSSI Interface Processor) 0 MIP (Multichannel Interface Processor) 0 or 1 TRIP (Token Ring Interface Processor)---0, 1, 2, or 3 |
Use the show interfaces async privileged EXEC command to display information about the serial interface.
| number | (Optional) Must be 1. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
Use the show interfaces atm EXEC command to display information about the ATM interface.
| slot/port | (Optional) In the Cisco 7000, slot can be 0, 1, 2, 3, or 4. In the Cisco 7010, slot can be 0, 1, or 2. Port must be 0. |
Use the show interfaces ethernet privileged EXEC command to display information about an Ethernet interface on the router.
| number | Must match a port number on the selected interface. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
| slot | (Optional) On a Cisco 7000 series, slot location of the interface processor. |
| port | (Optional) On a Cisco 7000 series, port number on the interface. |
Use the show interfaces fddi user EXEC command to display information about the FDDI interface.
| number | Port number on the selected interface. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
| slot | (Optional) On a Cisco 7000 series, slot location of the interface processor. |
| port | (Optional) On a Cisco 7000 series, port number on the interface. |
Use the show interfaces hssi privileged EXEC command to display information about the HSSI interface.
| number | Port number on the selected interface. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
| slot | (Optional) On a Cisco 7000 series, slot location of the interface processor. |
| port | (Optional) On a Cisco 7000 series, port number on the interface. |
To display statistics about a LAN Extender interface, use the show interface lex EXEC command.
| number | Number of the LAN Extender interface that resides on the core router about which to display statistics. |
| ethernet | (Optional) Displays statistics about the Ethernet interface that resides on the LAN Extender. |
| serial | (Optional) Displays statistics about the serial interface that resides on the LAN Extender. |
Use the show interfaces loopback privileged EXEC command to display information about the loopback interface.
| number | (Optional) Port number on the selected interface. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
Use the show interfaces serial privileged EXEC command to display information about a serial interface.
| number | (Optional) Interface port number. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
| slot | (Optional) On a Cisco 7000 series, slot location of the interface processor. |
| port | (Optional) On a Cisco 7000 series, port number. |
| :channel-group | (Optional) On the Cisco 7000 series supporting channelized T1, specifies the channel in the range of 0 to 23. |
Use the show interfaces tokenring privileged EXEC command to display information about the Token Ring interface and the state of source route bridging.
| number | (Optional) Must match an interface port line number. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
| slot | On a Cisco 7000 series, optional slot location of the interface processor. Value can be 0, 1, 2, 3, or 4 in the Cisco 7000. In the Cisco 7010, value can be 0, 1, or 2. |
| port | On a Cisco 7000 series, optional port number on interface. Value can be 0, 1, 2, or 3. |
To list tunnel interface information, use the show interfaces tunnel privileged EXEC command.
| number | Port line number. |
| accounting | (Optional) Displays the number of packets of each protocol type that have been sent through the interface. |
show interfaces vty number
Use the show interfaces vty EXEC command to display information about virtual asynchronous interfaces.
| number | Number of the virtual terminal (VTY) that has been configured for asynchronous protocol features (vty-async). |
To list a summary of an interface's IP information and status, use the show ip interface privileged EXEC command.
| brief | (Optional) Displays a brief summary of IP status and configuration. |
| type | (Optional) Specifies that information be displayed about that interface type only. The possible value depends on the type of interfaces the system has. For example, it could be ethernet, null, serial, tokenring, and so forth. |
| number | (Optional) Interface number. |
Use the show rif EXEC command to display the current contents of the RIF cache.
To disable an interface, use the shutdown interface configuration command. To restart a disabled interface, use the no form of this command.
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.
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.
| number | Number of buffers used to store unprocessed SMT messages that are to be queued for processing. Acceptable values are positive integers.The default threshold value is equal to the number of FDDI interfaces installed in the router. |
To configure source address control on a port on an Ethernet hub (repeater) 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.
| mac-address | (Optional) MAC address in the packets that the hub will allow to access the network. |
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.
| normal | Allows normal capability. The default value is normal range. |
| reduced | Allows extended 10BaseT capability. |
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.
| start-slot | The first subframe in the major frame. Range is 1 to 31 and must be less than or equal to stop-slot. |
| stop-slot | The last subframe in the major frame. Range is 1 to 31 and must be greater than or equal to start-slot. |
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. Use the no form of this command to disable the feature.
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.
| microseconds | Approximate number of microseconds of minimum delay after transmitting a packet on the MCI and SCI interface cards. The default is 0 microseconds. |
| hdlc-flags | Minimum number of HDLC flags to be sent between packets on the HIP, HSCI, FSIP, or HSSI. The valid range on the HSSI is 2 to 128000. |
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.
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.
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.
| hostname | Name of the host destination. |
| ip-address | IP address of the host destination expressed in decimal in four-part, dotted notation. |
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.
| key-number | Integer from 0 to 4294967295. |
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.
| aurp | AppleTalk Update Routing Protocol (AURP). |
| cayman | Cayman TunnelTalk AppleTalk encapsulation. |
| dvmrp | Distance Vector Multicast Routing Protocol. |
| eon | EON compatible CLNS tunnel. |
| gre ip | Generic route encapsulation GRE) protocol over IP. |
| nos | KA9Q/NOS compatible IP over IP. |
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.
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.
| ip-address | IP address to use as the source address for packets in the tunnel. |
| type | All types. |
| number | Specifies the port, connector, or interface card number. The numbers are assigned at the factory at the time of installation or when added to a system, and can be displayed with the show interfaces command. |
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.
| number | Maximum number of transmit buffers that the specified interface can subscribe. |
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