Interface Commands: dce-terminal-timing enable Through interface

This chapter explains the function and syntax of the interface commands dce-terminal-timing enable through interface. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS Interface Command Reference, Release 12.1.

dce-terminal-timing enable

To prevent phase shifting of the data with respect to the clock when running the line at high speeds and long distances, use the dce-terminal-timing enable interface configuration command. If SCTE terminal timing 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.

dce-terminal-timing enable

no dce-terminal-timing enable

Syntax Description

This command has no arguments or keywords.

delay

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

delay tens-of-microseconds

no delay

Syntax Description

tens-of-microseconds

Integer that specifies the delay in tens of microseconds for an interface or network segment. To see the default delay, use the show interfaces command.

tens-of-microseconds	Integer that specifies the delay in tens of microseconds for an interface or network segment. To see the default delay, use the show interfaces command.

description (controller)

To add a description to an E1 or T1 controller or the Channelized T3 Interface Processor (CT3IP) in Cisco 7500 series routers, use the description controller configuration command. To remove the description, use the no form of this command.

description string

no description

Syntax Description

string

Comment or a description (up to 80 characters) to help you remember what is attached to the interface.

string	Comment or a description (up to 80 characters) to help you remember what is attached to the interface.

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.

down-when-looped

Syntax Description

This command has no arguments or keywords.

dsu bandwidth

To specify the maximum allowable bandwidth used by the PA-E3 port adapter and PA-T3 port adapter, use the dsu bandwidth interface configuration command. To return to the default bandwidth, use the no form of this command.

dsu bandwidth kbps

no dsu bandwidth

Syntax Description

kbps

Maximum bandwidth in the range of 22 kbps to 44736 kbps. The default values are:

34010 kbps for PA-E3

44736 kbps for PA-T3

kbps	Maximum bandwidth in the range of 22 kbps to 44736 kbps. The default values are: 34010 kbps for PA-E3 44736 kbps for PA-T3

dsu mode

To specify the interoperability mode used by a PA-E3 port adapter or PA-T3 port adapter, use the dsu mode interface configuration command. To return to the default mode, use the no form of this command.

dsu mode {0 | 1 | 2}

no dsu mode

Syntax Description

0

Sets the interoperability mode to 0. This is the default. Specify mode 0 to connect a PA-E3 port adapter to another PA-E3 port adapter or to a Digital Link DSU (DL3100). Use mode 0 to connect a PA-T3 port adapter to another PA-T3 port adapter or to a Digital Link DSU (DL3100).

1

Sets the interoperability mode to 1. Specify mode 1 to connect a PA-E3 port adapter or PA-T3 port adapter to a Kentrox DSU.

2

Sets the interoperability mode to 2. Specify mode 2 to connect a PA-T3 port adapter to a Larscom DSU.

0	Sets the interoperability mode to 0. This is the default. Specify mode 0 to connect a PA-E3 port adapter to another PA-E3 port adapter or to a Digital Link DSU (DL3100). Use mode 0 to connect a PA-T3 port adapter to another PA-T3 port adapter or to a Digital Link DSU (DL3100).
1	Sets the interoperability mode to 1. Specify mode 1 to connect a PA-E3 port adapter or PA-T3 port adapter to a Kentrox DSU.
2	Sets the interoperability mode to 2. Specify mode 2 to connect a PA-T3 port adapter to a Larscom DSU.

dte-invert-txc

On the Cisco 4000 series, you can specify the serial Network Processor Module timing signal configuration. When the board is operating as a DTE, use the dte-invert-txc interface configuration command to invert the TXC clock signal received from the DCE. If the DCE accepts SCTE from the DTE, use the no form of this command.

dte-invert-txc

no dte-invert-txc

Syntax Description

This command has no arguments or keywords.

duplex

To configure duplex operation on an interface, use the duplex interface configuration command. To return the system to half-duplex mode, the system default, use the no form of this command.

duplex {full | half | auto}

no duplex

Syntax Description

full

Specifies full-duplex operation.

half

Specifies half-duplex operation. This is the default.

auto

Specifies the autonegotiation capability. The interface automatically operates at half or full duplex, depending on environmental factors, such as the type of media and transmission speeds for the peer routers, hubs, and switches used in the network configuration.

full	Specifies full-duplex operation.
half	Specifies half-duplex operation. This is the default.
auto	Specifies the autonegotiation capability. The interface automatically operates at half or full duplex, depending on environmental factors, such as the type of media and transmission speeds for the peer routers, hubs, and switches used in the network configuration.

e2-clockrate

To configure the serial0 interface for E2 (8 Mhz full duplex) and to shut down the other three serial interfaces (1 to 3), use the e2-clockrate privileged EXEC command. To disable the full duplex E2, use the no form of this command.

e2-clockrate

no e2-clockrate

Syntax Description

This command has no arguments or keywords.

early-token-release

To enable early token release on Token Ring interfaces, use the early-token-release interface configuration command. To disable this feature, use the no form of the command.

early-token-release

no early-token-release

Syntax Description

This command has no arguments or keywords.

encapsulation

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

encapsulation encapsulation-type

Syntax Description

encapsulation-type

Encapsulation type; one of the following keywords:

atm-dxi---Asynchronous Transfer Mode-Data Exchange Interface.

bstun---Block Serial Tunnel.

frame-relay---Frame Relay (for serial interface).

hdlc---High-Level Data Link Control (HDLC) protocol for serial interface. This encapsulation method provides the synchronous framing and error detection functions of HDLC without windowing or retransmission. This is the default for synchronous serial interfaces.

isl---Inter-Switch Link (ISL) (for virtual LANs).

lapb---X.25 LAPB DTE operation (for serial interface).

ppp---Point-to-Point Protocol (PPP ) (for serial interface).

sde---IEEE 802.10 Security Data Exchange.

sdlc---IBM serial SNA.

sdlc-primary---IBM serial SNA (for primary serial interface).

sdlc-secondary---IBM serial SNA (for secondary serial interface).

slip---Specifies SLIP encapsulation for an interface configured for dedicated asynchronous mode or DDR. This is the default for asynchronous interfaces.

smds---Switched Multimegabit Data Services (SMDS) (for serial interface).

encapsulation-type	Encapsulation type; one of the following keywords: atm-dxi---Asynchronous Transfer Mode-Data Exchange Interface. bstun---Block Serial Tunnel. frame-relay---Frame Relay (for serial interface). hdlc---High-Level Data Link Control (HDLC) protocol for serial interface. This encapsulation method provides the synchronous framing and error detection functions of HDLC without windowing or retransmission. This is the default for synchronous serial interfaces. isl---Inter-Switch Link (ISL) (for virtual LANs). lapb---X.25 LAPB DTE operation (for serial interface). ppp---Point-to-Point Protocol (PPP ) (for serial interface). sde---IEEE 802.10 Security Data Exchange. sdlc---IBM serial SNA. sdlc-primary---IBM serial SNA (for primary serial interface). sdlc-secondary---IBM serial SNA (for secondary serial interface). slip---Specifies SLIP encapsulation for an interface configured for dedicated asynchronous mode or DDR. This is the default for asynchronous interfaces. smds---Switched Multimegabit Data Services (SMDS) (for serial interface).

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. To revert to the default value, use the no form of this command.

fddi burst-count number

no fddi burst-count

Syntax Description

number

Number of preallocated buffers in the range from 1 to 10. The default is 3.

number	Number of preallocated buffers in the range from 1 to 10. The default is 3.

fddi c-min

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

fddi c-min microseconds

no fddi c-min

Syntax Description

microseconds

Sets the timer value in microseconds. The default is 1600 microseconds.

microseconds	Sets the timer value in microseconds. The default is 1600 microseconds.

fddi cmt-signal-bits

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

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

Syntax Description

signal-bits

A hexadecimal number preceded by 0x; for example, 0x208. The FDDI standard defines 10 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, as defined in Table 3.

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; set as defined in Table 4.

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.

phy-a

(Optional) Selects Physical Sublayer A. The default is 0x008 (hexadecimal) or 00 0000 1000 (binary). Bits 1 and 2 are set to 00 to select Physical A. Bit 3 is set to 1 to indicate "accept any connection."

phy-b

(Optional) Selects Physical Sublayer B. The default is 0x20c (hexadecimal) or 10 0000 1100 (binary). Bits 1 and 2 are set to 10 to select Physical B. Bit 3 is set to 1 to indicate "accept any connection." Bit 9 is set to 1 to select MAC on output. The normal data flow on FDDI is input on Physical A and output on Physical B.

signal-bits	A hexadecimal number preceded by 0x; for example, 0x208. The FDDI standard defines 10 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, as defined in Table 3. 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; set as defined in Table 4. 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.
phy-a	(Optional) Selects Physical Sublayer A. The default is 0x008 (hexadecimal) or 00 0000 1000 (binary). Bits 1 and 2 are set to 00 to select Physical A. Bit 3 is set to 1 to indicate "accept any connection."
phy-b	(Optional) Selects Physical Sublayer B. The default is 0x20c (hexadecimal) or 10 0000 1100 (binary). Bits 1 and 2 are set to 10 to select Physical B. Bit 3 is set to 1 to indicate "accept any connection." Bit 9 is set to 1 to select MAC on output. The normal data flow on FDDI is input on Physical A and output on Physical B.

Table 3: FDDI Physical Type Bit Specifications

Bit 2 Bit 1 Physical Type

0

0

Physical A

1

0

Physical B

0

1

Physical S

1

1

Physical M

Bit 2	Bit 1	Physical Type
0	0	Physical A
1	0	Physical B
0	1	Physical S
1	1	Physical M

Table 4: FDDI Link Confidence Test Duration Bit Specification

Bit 5 Bit 4 Test Duration

0

0

Short test (default 50 ms)

1

0

Medium test (default 500 ms)

0

1

Long test (default 5 seconds)

1

1

Extended test (default 50 seconds)

Bit 5	Bit 4	Test Duration
0	0	Short test (default 50 ms)
1	0	Medium test (default 500 ms)
0	1	Long test (default 5 seconds)
1	1	Extended test (default 50 seconds)

There is not a no form of this command.

fddi duplicate-address-check

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

fddi duplicate-address-check

no fddi duplicate-address-check

Syntax Description

This command has no arguments or keywords.

fddi encapsulate

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

fddi encapsulate

no fddi encapsulate

Syntax Description

This command has no arguments or keywords.

fddi frames-per-token

To specify the maximum number of frames that the FDDI interface will transmit per token capture, use the fddi frames-per-token interface configuration command. To revert to the default values, use the no form of this command.

fddi frames-per-token number

no fddi frames-per-token

Syntax Description

number

Maximum number of frames to transmit per token capture. Valid values are from 1 to 10. The default is 3.

number	Maximum number of frames to transmit per token capture. Valid values are from 1 to 10. The default is 3.

fddi smt-frames

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

fddi smt-frames

no fddi smt-frames

Syntax Description

This command has no arguments or keywords.

fddi tb-min

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

fddi tb-min milliseconds

no fddi tb-min

Syntax Description

milliseconds

Number that sets the TB-Min timer value. The range is 0 to 65,535 ms. The default is 100 ms.

milliseconds	Number that sets the TB-Min timer value. The range is 0 to 65,535 ms. The default is 100 ms.

fddi tl-min-time

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 tl-min-time microseconds

Syntax Description

microseconds

Number 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 range is 0 to 4,294,967,295 microseconds. The default is 30 microseconds.

microseconds	Number 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 range is 0 to 4,294,967,295 microseconds. The default is 30 microseconds.

fddi t-out

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

fddi t-out milliseconds

no fddi t-out

Syntax Description

milliseconds

Number that sets the timeout timer. The range is 0 to 65,535 ms. The default is 100 ms.

milliseconds	Number that sets the timeout timer. The range is 0 to 65,535 ms. The default is 100 ms.

fddi token-rotation-time

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. To revert to the default value, use the no form of this command.

fddi token-rotation-time microseconds

no fddi token-rotation-time

Syntax Description

microseconds

Number that specifies the token rotation time (TRT). The range is 4000 to 165,000 microseconds. The default is 5000 microseconds.

microseconds	Number that specifies the token rotation time (TRT). The range is 4000 to 165,000 microseconds. The default is 5000 microseconds.

fddi valid-transmission-time

To recover from a transient ring error, use the fddi valid-transmission-time interface configuration command. To revert to the default value, use the no form of this command.

fddi valid-transmission-time microseconds

no fddi valid-transmission-time

Syntax Description

microseconds

Number that specifies the transmission valid timer (TVX) interval. The range is 2500 to 2,147,483,647 microseconds. The default is 2500 microseconds.

microseconds	Number that specifies the transmission valid timer (TVX) interval. The range is 2500 to 2,147,483,647 microseconds. The default is 2500 microseconds.

fdl

To set the Facility Data Link (FDL) exchange standard for the CSU controllers, or to set the FDL exchange standard for a T1 interface that uses Extended Super Frame (ESF) framing format, enter the fdl controller configuration or ATM interface configuration command. To disable FDL support or to specify that there is no ESF FDL, use the no form of this command.

Cisco MC3810 Multiservice Access Concentrator

fdl {att | ansi | both}

no fdl {att | ansi | both}

Cisco 2600 or 3600 Series Routers

fdl {att | ansi | all | none}

no fdl {att | ansi | all | none}

Syntax Description

att

Selects AT&T technical reference 54016 for ESF FDL exchange support.

ansi

Selects ANSI T1.403 for ESF FDL exchange support.

both

Specifies support both AT&T technical reference 54016 and ANSI T1.403 for ESF FDL exchange support.

all

Specifies support for both AT&T technical reference 54016 and ANSI T1.403 for ESF FDL exchange support.

none

Specifies that there is no support for ESF FDL exchange.

att	Selects AT&T technical reference 54016 for ESF FDL exchange support.
ansi	Selects ANSI T1.403 for ESF FDL exchange support.
both	Specifies support both AT&T technical reference 54016 and ANSI T1.403 for ESF FDL exchange support.
all	Specifies support for both AT&T technical reference 54016 and ANSI T1.403 for ESF FDL exchange support.
none	Specifies that there is no support for ESF FDL exchange.

frame-relay

To configure Frame Relay payload compression for each Frame Relay port, use the frame-relay interface configuration command. To terminate this form of payload compression over Frame Relay, use the no form of this command.

frame-relay payload-compression frf9 stac caim [element-number]

no frame-relay payload-compression

Syntax Description

payload-compression

Packet-by-packet payload compression, using the Stacker method.

frf9 stac

Enables FRF.9 compression using the Stacker method.

If the router contains a data compression Advanced Interface Module (AIM) for the Cisco 2600 series router, compression is performed in the hardware (hardware compression).

If the CAIM is not available, compression is performed in the software installed on the router's main processor (software compression).

caim element-number

(Optional) Enable the data compression AIM hardware compression daughtercard to do compression, at the element numbered beginning with 0 and incrementing to include all possible elements.

payload-compression	Packet-by-packet payload compression, using the Stacker method.
frf9 stac	Enables FRF.9 compression using the Stacker method. If the router contains a data compression Advanced Interface Module (AIM) for the Cisco 2600 series router, compression is performed in the hardware (hardware compression). If the CAIM is not available, compression is performed in the software installed on the router's main processor (software compression).
caim element-number	(Optional) Enable the data compression AIM hardware compression daughtercard to do compression, at the element numbered beginning with 0 and incrementing to include all possible elements.

frame-relay map

To enable Frame Relay compression on a DLC basis, enter the frame-relay map interface configuration command. To deactivate Frame Relay compression, use the no form of this command.

frame-relay map {protocol protocol-address dlci} payload-compression frf9 stac caim [element-number]

no frame-relay map

Syntax Description

map

Defines mapping between a destination protocol address and the DLCI used to connect to the destination address.

protocol

Supported protocol, bridging, or logical link control keywords: appletalk, decnet, dlsw, ip, ipx, llc2, rsrb, vines and xns.

protocol-address

Destination protocol address.

dlci

DLCI number used to connect to the specified protocol address on the interface.

payload-compression

Packet-by-packet payload compression, using the Stacker method.

frf9

Data compression over Frame Relay.

stac

Specifies that a Stacker (LZS) compression algorithm will be used on LAPB, HDLC, and PPP encapsulation. Compression is implemented in the hardware Advanced Interface Module installed in the router.

caim

Enables the data compression AIM hardware compression daughtercard to do compression.

element-number

(Optional) Compression element number, beginning with 0 and including all possible elements.

map	Defines mapping between a destination protocol address and the DLCI used to connect to the destination address.
protocol	Supported protocol, bridging, or logical link control keywords: appletalk, decnet, dlsw, ip, ipx, llc2, rsrb, vines and xns.
protocol-address	Destination protocol address.
dlci	DLCI number used to connect to the specified protocol address on the interface.
payload-compression	Packet-by-packet payload compression, using the Stacker method.
frf9	Data compression over Frame Relay.
stac	Specifies that a Stacker (LZS) compression algorithm will be used on LAPB, HDLC, and PPP encapsulation. Compression is implemented in the hardware Advanced Interface Module installed in the router.
caim	Enables the data compression AIM hardware compression daughtercard to do compression.
element-number	(Optional) Compression element number, beginning with 0 and including all possible elements.

framing (E1/T1 controller)

To select the frame type for the E1 or T1 data line, use the framing controller configuration command.

T1 Lines

framing {sf | esf}

E1 Lines

framing {crc4 | no-crc4} [australia]

Syntax Description

sf

Specifies super frame as the T1 frame type. This is the default.

esf

Specifies extended super frame as the T1 frame type.

crc4

Specifies CRC4 frame as the E1 frame type. This is the default for Australia.

no-crc4

Specifies no CRC4 frame as the E1 frame type.

australia

(Optional) Specifies the E1 frame type used in Australia.

sf	Specifies super frame as the T1 frame type. This is the default.
esf	Specifies extended super frame as the T1 frame type.
crc4	Specifies CRC4 frame as the E1 frame type. This is the default for Australia.
no-crc4	Specifies no CRC4 frame as the E1 frame type.
australia	(Optional) Specifies the E1 frame type used in Australia.

framing (E3/T3 interface)

To specify E3 or T3 line framing for a PA-E3 port adapter or PA-T3 port adapter, use the framing interface configuration command. To return to the default G.751 framing or C-bit framing, use the no form of this command.

PA-E3

framing {bypass | g751}

no framing

PA-T3

framing {c-bit | m13 | bypass}

no framing

Syntax Description

bypass

Specifies bypass E3 framing.

g751

Specifies G.751 E3 framing. This is the default for the PA-E3.

c-bit

Specifies that the C-bit framing is used as the T3 framing type. This is the default for the PA-T3.

m13

Specifies m13 T3 framing.

bypass	Specifies bypass E3 framing.
g751	Specifies G.751 E3 framing. This is the default for the PA-E3.
c-bit	Specifies that the C-bit framing is used as the T3 framing type. This is the default for the PA-T3.
m13	Specifies m13 T3 framing.

framing (T3 controller)

To specify T3 line framing used by the CT3 feature board in a Cisco AS5800 universal access server, or by the CT3IP port adapter in Cisco 7500 series routers, use the framing controller configuration command. To restore the default framing type, use the no form of this command.

Cisco AS5800 universal access server

framing {c-bit | m23}

no framing

Cisco 7500 series routers

framing {c-bit | m23 | auto-detect}

no framing

Syntax Description

c-bit

Specifies that C-bit framing is used as the T3 framing type. This is the default for the CT3 in a Cisco AS5800.

m23

Specifies that M23 framing is used as the T3 framing type.

auto-detect

Specifies that the CT3IP detects the framing type it receives from the far-end equipment. This is the default for the CT3IP in a Cisco 7500 series router.

c-bit	Specifies that C-bit framing is used as the T3 framing type. This is the default for the CT3 in a Cisco AS5800.
m23	Specifies that M23 framing is used as the T3 framing type.
auto-detect	Specifies that the CT3IP detects the framing type it receives from the far-end equipment. This is the default for the CT3IP in a Cisco 7500 series router.

full-duplex

To specify full-duplex mode on full-duplex single-mode and multimode port adapters, use the full-duplex interface configuration command. To restore the default half-duplex mode, use the no form of this command.

full-duplex

no full-duplex

Syntax Description

This command has no arguments or keywords.

half-duplex

To specify half-duplex mode on an SDLC interface or on the FDDI full-duplex, single-mode port adapter and FDDI full-duplex, multimode port adapter on the Cisco 7200 series and Cisco 7500 series routers, use the half-duplex interface configuration command. Refer to the Cisco Product Catalog for specific model numbers of port adapters. To reset the interface for full-duplex mode, use the no form of this command.

half-duplex

no half-duplex

Syntax Description

This command has no arguments or keywords.

half-duplex controlled-carrier

To place a low-speed serial interface in controlled-carrier mode, instead of constant-carrier mode, use the half-duplex controlled-carrier interface configuration command. To return the interface to constant-carrier mode, use the no form of this command.

half-duplex controlled-carrier

no half-duplex controlled-carrier

Syntax Description

This command has no arguments or keywords.

half-duplex timer

To tune half-duplex timers, use the half-duplex timer interface configuration command. To return to the default value for that parameter, use the no form of this command along with the appropriate keyword.

half-duplex timer {cts-delay value | cts-drop-timeout value | dcd-drop-delay value | dcd-txstart-delay value | rts-drop-delay value | rts-timeout value | transmit-delay value}

no half-duplex timer {cts-delay value | cts-drop-timeout value | dcd-drop-delay value | dcd-txstart-delay value | rts-drop-delay value | rts-timeout value | transmit-delay value}

Syntax Description

cts-delay value

Specifies the delay introduced by the DCE interface between the time it detects RTS to the time it asserts CTS in response. The range is dependent on the serial interface hardware. The default cts-delay value is 0 ms.

cts-drop-timeout value

Determines the amount of time a DTE interface waits for CTS to be deasserted after it has deasserted RTS. If CTS is not deasserted during this time, an error counter is incremented to note this event. The range is 0 to 1140000 ms (1140 seconds). The default cts-drop-timeout value is 250 ms.

dcd-drop-delay value

Applies to DCE half-duplex interfaces operating in controlled-carrier mode (see the half-duplex controlled-carrier command). This timer determines the delay between the end of transmission by the DCE and the deassertion of DCD. The range is 0 to 4400 ms (4.4 seconds). The default dcd-drop-delay value is 100 ms.

dcd-txstart-delay value

Applies to DCE half-duplex interfaces operating in controlled-carrier mode. This timer determines the time delay between the assertion of DCD and the start of data transmission by the DCE interface. The range is 0 to 1140000 ms (1140 seconds). The default dcd-txstart-delay value is 100 ms.

rts-drop-delay value

Specifies the time delay between the end of transmission by the DTE interface and deassertion of RTS. The range is 0 to 1140000 ms (1140 seconds). The default rts-drop-delay value is 3 ms.

rts-timeout value

Determines the number of milliseconds the DTE waits for CTS to be asserted after the assertion of RTS before giving up on its transmission attempt. If CTS is not asserted in the specified amount of time, an error counter is incremented. The range is dependent on the serial interface hardware. The default rts-timeout value is 3 ms.

transmit-delay value

Specifies the number of milliseconds a half-duplex interface will delay the start of transmission. In the case of a DTE interface, this delay specifies how long the interface waits after something shows up in the transmit queue before asserting RTS. For a DCE interface, this dictates how long the interface waits after data is placed in the transmit queue before starting transmission. If the DCE interface is in controlled-carrier mode, this delay shows up as a delayed assertion of DCD.

This timer enables the transmitter to be adjusted if the receiver is a little slow and is not able to keep up with the transmitter. The range is 0 to 4400 ms (4.4 seconds). The default transmit-delay value is 0 ms.

cts-delay value	Specifies the delay introduced by the DCE interface between the time it detects RTS to the time it asserts CTS in response. The range is dependent on the serial interface hardware. The default cts-delay value is 0 ms.
cts-drop-timeout value	Determines the amount of time a DTE interface waits for CTS to be deasserted after it has deasserted RTS. If CTS is not deasserted during this time, an error counter is incremented to note this event. The range is 0 to 1140000 ms (1140 seconds). The default cts-drop-timeout value is 250 ms.
dcd-drop-delay value	Applies to DCE half-duplex interfaces operating in controlled-carrier mode (see the half-duplex controlled-carrier command). This timer determines the delay between the end of transmission by the DCE and the deassertion of DCD. The range is 0 to 4400 ms (4.4 seconds). The default dcd-drop-delay value is 100 ms.
dcd-txstart-delay value	Applies to DCE half-duplex interfaces operating in controlled-carrier mode. This timer determines the time delay between the assertion of DCD and the start of data transmission by the DCE interface. The range is 0 to 1140000 ms (1140 seconds). The default dcd-txstart-delay value is 100 ms.
rts-drop-delay value	Specifies the time delay between the end of transmission by the DTE interface and deassertion of RTS. The range is 0 to 1140000 ms (1140 seconds). The default rts-drop-delay value is 3 ms.
rts-timeout value	Determines the number of milliseconds the DTE waits for CTS to be asserted after the assertion of RTS before giving up on its transmission attempt. If CTS is not asserted in the specified amount of time, an error counter is incremented. The range is dependent on the serial interface hardware. The default rts-timeout value is 3 ms.
transmit-delay value	Specifies the number of milliseconds a half-duplex interface will delay the start of transmission. In the case of a DTE interface, this delay specifies how long the interface waits after something shows up in the transmit queue before asserting RTS. For a DCE interface, this dictates how long the interface waits after data is placed in the transmit queue before starting transmission. If the DCE interface is in controlled-carrier mode, this delay shows up as a delayed assertion of DCD. This timer enables the transmitter to be adjusted if the receiver is a little slow and is not able to keep up with the transmitter. The range is 0 to 4400 ms (4.4 seconds). The default transmit-delay value is 0 ms.

hold-queue

To limit the size of the IP output queue on an interface, use the hold-queue interface configuration command. To restore the default values for an interface, use the no form of this command with the appropriate keyword.

hold-queue length {in | out}

no hold-queue {in | out}

Syntax Description

length

Integer that specifies the maximum number of packets in the queue. The range of allowed values is 0 to 65535.

in

Specifies the input queue. The default is 75 packets. For asynchronous interfaces the default is 10 packets.

out

Specifies the output queue. The default is 40 packets. For asynchronous interfaces the default is 10 packets.

length	Integer that specifies the maximum number of packets in the queue. The range of allowed values is 0 to 65535.
in	Specifies the input queue. The default is 75 packets. For asynchronous interfaces the default is 10 packets.
out	Specifies the output queue. The default is 40 packets. For asynchronous interfaces the default is 10 packets.

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. To disable the feature, use the no form of this command.

hssi external-loop-request

no hssi external-loop-request

Syntax Description

This command has no arguments or keywords.

hssi internal-clock

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

hssi internal-clock

no hssi internal-clock

Syntax Description

This command has no arguments or keywords.

hub

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

hub ethernet number port [end-port]

Syntax Description

ethernet

Indicates that the hub is in front of an Ethernet interface.

number

Hub number, starting with 0. Because there is only one hub, this number is 0.

port

Port number on the hub. On the Cisco 2505 router, port numbers range from 1 to 8. On the Cisco 2507 router, port numbers range from 1 to 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.

ignore-dcd

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

ignore-dcd

no ignore-dcd

Syntax Description

This command has no arguments or keywords.

ignore-hw local-loopback

To disable the monitoring of the LL pin when in DCE mode, use the ingnore-hw local-loopback interface configuration command. To return to the default, use the no form of this command.

ignore-hw local-loopback

no ignore-hw local-loopback

Syntax Description

This command has no arguments or keywords.

interface

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

interface type number [name-tag]

Cisco 7200 Series and Cisco 7500 Series with a Packet over SONET Interface Processor

interface type slot/port

Cisco 7500 Series with Ports on VIP Cards

interface type slot/port-adapter/port [ethernet | serial]

Cisco 7500 Series with Channelized T1 or E1

interface serial slot/port:channel-group

Cisco 4000 Series with Channelized T1 or E1 and the Cisco MC3810

interface serial number:channel-group

To configure a subinterface, use this form of the interface global configuration commands:

Cisco 7500 Series with Ports on VIP Cards

interface type slot/port-adapter/port.subinterface-number [multipoint | point-to-point]

Cisco 7200 Series

interface type slot/port.subinterface-number [multipoint | point-to-point]

Cisco 7500 Series

interface type slot/port-adapter.subinterface-number [multipoint | point-to-point]

Syntax Description

type

Type of interface to be configured.

number

Port, connector, or interface card number. On a Cisco 4000 series router, specifies the NPM 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.

name-tag

(Optional) Specifies the logic name to identify the server configuration so that multiple entries of server configuration can be entered.

This optional argument is for use with the RLM feature.

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.

ethernet

Ethernet IEEE 802.3 interface.

serial

Serial interface.

:channel-group

Cisco 4000 series routers specify the T1 channel group number in the range of 0 to 23 defined with the channel-group controller configuration command. On a dual port card, it is possible to run channelized on one port and primary rate on the other port.

Cisco MC3810 specifies the T1/E1 channel group 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 to which this subinterface belongs.

multipoint | point-to-point

(Optional) Specifies a multipoint or point-to-point subinterface. There is no default.

ethernet	Indicates that the hub is in front of an Ethernet interface.
number	Hub number, starting with 0. Because there is only one hub, this number is 0.
port	Port number on the hub. On the Cisco 2505 router, port numbers range from 1 to 8. On the Cisco 2507 router, port numbers range from 1 to 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.

type	Type of interface to be configured.
number	Port, connector, or interface card number. On a Cisco 4000 series router, specifies the NPM 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.
name-tag	(Optional) Specifies the logic name to identify the server configuration so that multiple entries of server configuration can be entered. This optional argument is for use with the RLM feature.
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.
ethernet	Ethernet IEEE 802.3 interface.
serial	Serial interface.
:channel-group	Cisco 4000 series routers specify the T1 channel group number in the range of 0 to 23 defined with the channel-group controller configuration command. On a dual port card, it is possible to run channelized on one port and primary rate on the other port. Cisco MC3810 specifies the T1/E1 channel group 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 to which this subinterface belongs.
multipoint \| point-to-point	(Optional) Specifies a multipoint or point-to-point subinterface. There is no default.

Table of Contents

Interface Commands: dce-terminal-timing enable Through interface

frame-relay