Table Of Contents

ATM Commands

atm compression

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

atm pvc

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

cbr

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces cell-loss-integration-period

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces clockmode synchronous

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces connect

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces initial-delay

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces max-buf-size

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces partial-fill

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ces service

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

compress

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

encapsulation

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

encapsulation atm

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

encapsulation atm-ces

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

loopback

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

pvc

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

vbr-rt

Syntax Description

Defaults

Command Mode

Command History

Usage Guidelines

Examples

Related Commands

ATM Commands

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This chapter describes the ATM commands and command syntax that are unique to Cisco MC3810 series concentrators. ATM commands that do not differ from standard Cisco IOS software are not documented here. For information about standard ATM commands from Cisco IOS software, refer to the Wide-Area Networking Command Reference.

For ATM configuration information and examples, refer to the Wide-Area Networking Configuration Guide.

•atm compression

•atm pvc

•cbr

•ces cell-loss-integration-period

•ces clockmode synchronous

•ces connect

•ces initial-delay

•ces max-buf-size

•ces partial-fill

•ces service

•compress

•encapsulation

•encapsulation atm

•encapsulation atm-ces

•loopback

•pvc

•vbr-rt

atm compression

To specify the software compression mode on the Cisco MC3810, use the atm compression interface configuration command. Use the no form of this command to remove the compression mode setting.

atm compression {per-packet | per-interface | per-vc}
no atm compression {per-packet | per-interface | per-vc}

Syntax Description

per-packet	Packet-by-packet compression mode (no history). This is the default.
per-interface	One context per interface (with history).
per-vc	One context for every virtual circuit (with history).

Defaults

Packet-by-packet compression is enabled.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

Examples

The following example configures per-packet ATM compression for a Cisco MC3810 running Cisco IOS Release 11.3 MA:

interface serial2

 atm compression per-packet

The following example configures per-packet ATM compression for a Cisco MC3810 running Cisco IOS Release 12.0 or later:

interface atm0

 atm compression per-packet

Related Commands

Command	Description
compress	Specifies compression for the voice connection on an ATM permanent virtual circuit (PVC).

atm pvc

To create a PVC on an ATM interface and, optionally, to generate Operation, Administration, and Maintenance (OAM) F5 loopback cells or enable Inverse ATM Address Resolution Protocol (ARP), use the atm pvc interface configuration command. The no form of this command removes the specified PVC.

In Cisco IOS Releases prior to 12.0:

atm pvc vcd vpi vci aal-encap [peak average [burst]] [inarp [minutes]] [oam [seconds]]
[compress]
no atm pvc vcd vpi vci aal-encap [peak average [burst]] [inarp [minutes]] [oam [seconds]]
[compress]

In Cisco IOS Releases 12.0 and later, this command is superseded by the atm command.

Syntax Description

vcd	Virtual circuit descriptor. A unique number that identifies to the processor which VPI-VCI pair to use for a particular packet. Valid values range from 1 to the value set with the atm max vc command. The AIP or ATM port adapter requires this feature to manage packet transmission. The vcd value is not associated with the VPI-VCI pair used for the ATM network cells. The NPM has a hard-coded max vcd value of 1023. Valid values are 1 to 1023.
vpi	ATM network virtual path identifier (VPI) of this PVC. The VPI is an 8-bit field in the header of the ATM cell. The VPI value is unique only on a single link, not throughout the ATM network, because it has local significance only. The VPI value must match that of the switch. Valid values are 0 to 255. The arguments vpi and vci cannot both be set to 0; if one is 0, the other cannot be 0.
vci	ATM network virtual channel identifier (VCI) of this PVC, in the range of 0 to 1 less than the maximum value set for this interface by the atm per-vc per-vp command. Typically, lower values of 0 to 31 are reserved for specific traffic and should not be used (for example, F4 OAM, SVC signaling, ILMI, and so on). Valid values are 0 to 1023. The VCI is a 16-bit field in the header of the ATM cell. The VCI value is unique only on a single link, not throughout the ATM network, because it has local significance only. The arguments vpi and vci cannot both be set to 0; if one is 0, the other cannot be 0.
aal-encap	ATM adaptation layer (AAL) and encapsulation type. Possible values are as follows: •aal5snap—Used for Logical Link Control/Subnetwork Access Protocol (LLC/SNAP) precedes the protocol datagram. This is the only encapsulation supported for Inverse ARP. •aal1—Used to encapsulate streaming video packets over ATM. •aal5fratm—Used for the Frame Relay-ATM interworking function. •aal5voice—Used for voice traffic over ATM.
aal-encap (continued)	•aal5mux—Used for Multiplex-type virtual circuit. •aal5nlpid—Used for High-Speed Serial Interfaces (HSSIs) that are using an ATM data service unit (ADSU) and running ATM-Data Exchange Interface (DXI). •ilmi—Used to define the PVC for ILMI.
peak	(Optional) Maximum rate (in kbps) at which this virtual circuit can transmit. The valid range is 56 to 10000. If configuring Voice over ATM, you must configure the peak, average and burst values. To calculate the peak rate for the number of voice calls, use the following calculation: (2 x the number of calls) x 16
average	(Optional) Average rate (in kbps) at which this virtual circuit transmits. Valid values are platform dependent. If configuring Voice over ATM, you must configure the peak, average and burst values. To calculate the average rate for the number of voice calls, use the following calculation: (1 x the number of calls) x 16
burst	(Optional) Value that relates to the maximum number of ATM cells the virtual circuit can transmit to the network at the peak rate of the PVC for bursty traffic. If configuring Voice over ATM, you must configure the peak, average and burst values. To calculate the burst rate for the number of voice calls, use the following calculation: 4 x the number of calls
inarp minutes	(Optional) (Set for the aal5snap encapsulation only) Specifies how often Inverse ARP datagrams are sent on this virtual circuit. The valid range is 1 to 60. The default value is 15 minutes.
oam seconds	(Optional) Specifies the time interval in seconds for generating OAM F5 loopback cells from this virtual circuit. The valid range is 1 to 600. The default value is 10.
compress	(Optional) Enables payload compression. If compression hardware is present, then the compression method is hardware. If compression hardware is not present, software compression is used. This option is available only on the Cisco MC3810.

Defaults

If the oam keyword is omitted, OAM cells are not generated. If the oam keyword is present but the seconds value is omitted, the default value of oam seconds is 10 seconds.

If the inarp keyword is omitted, Inverse ARPs are not generated. If the inarp keyword is present, but the timeout value is not given, then Inverse ARPs are generated every 15 minutes.

If peak and average rate values are omitted, the PVC defaults to peak and average rates equal to the link rate. The peak and average rates are then equal. By default, the virtual circuit is configured to run as fast as possible.

Command Mode

Interface configuration

Command History

Release	Modification
10.0	This command was first introduced.
11.0	The oam seconds and inarp minutes commands first appeared.
12.0	This command was replaced by the pvc command.

Usage Guidelines

The order of command options is important. The inarp keyword can be specified either separately or before the oam keyword has been enabled. The peak, average, and burst arguments, if specified, cannot be specified after either the inarp or the oam keywords.

The Cisco IOS software dynamically creates rate queues as necessary to satisfy the requests of atm pvc commands. The software dynamically creates a rate queue when an atm pvc command specifies a peak or average rate that does not match any user-configured rate queue.

The atm pvc command creates a PVC and attaches it to the VPI and VCI specified. The arguments vpi and vci cannot both be specified as 0; if one is 0, the other cannot be 0. The aal-encap argument determines the AAL mode and the encapsulation method used. The peak and average arguments determine the rate queue used.

If you choose to specify peak or average values, you must specify both.

The router generates and echoes OAM F5 loopback cells, which verify connectivity. If OAM cell generation is enabled, a cell is transmitted periodically. The remote end must respond by echoing back the cells.

The router does not generate alarm indication signal (AIS) cells, which are used for alarm surveillance functions. However, if it receives an AIS cell, it responds by sending an OAM far-end remote failure (FERF) cell.

Examples

The following example configures a PVC with a VCD of 1, a VPI of 100, and a VCI of 100, for VoATM capable of handling 12 calls, with an OAM F5 loopback cell generated every 10 seconds, and payload compression enabled, for a Cisco MC3810 running Cisco IOS Release 11.3 MA:

interface serial2

 atm pvc 1 100 100 aal5voice 384 192 48 oam 10 compress

cbr

To configure the constant bit rate (CBR) for the ATM circuit emulation service (CES) for an ATM permanent virtual circuit (PVC) on the Cisco MC3810, use the cbr command. Use the no form of this command to restore the default.

cbr rate
no cbr rate

Syntax Description

rate	Constant bit rate (also known as the average cell rate) for ATM CES, in kbps. The valid range is 56 to 10000.

Defaults

No CBR value is configured.

Command Mode

ATM virtual circuit configuration

Command History

Release	Modification
12.0	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

Examples

The following example configures the constant bit rate on ATM PVC 20 on the Cisco MC3810:

pvc 20

 cbr 56

Related Commands

Command	Description
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period.
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces initial-delay	Configures the size of the receive buffer of a CES circuit.
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the number of user octets per cell for the ATM CES.
ces service	Configures the ATM circuit emulation service (CES) type.
encapsulation atm-ces	Enables CES ATM encapsulation on the Cisco MC3810.

ces cell-loss-integration-period

To set the circuit emulation service (CES) cell-loss integration period, use the ces cell-loss-integration-period interface configuration command. Use the no form of this command to delete the cell-loss integration period.

ces cell-loss-integration-period period
no ces cell-loss-integration-period period

Syntax Description

period

Time in milliseconds for the cell loss integration period. Possible values are 1 to 2147483647.

Defaults

2500

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

This command is supported on serial ports 0 and 1 with encapsulation atm-ces.

Examples

The following example configures the CES cell-loss integration period to 1056 milliseconds on serial port 0:

interface serial 0

 ces cell-loss-integration-period 1056

Related Commands

Command	Description
cbr	Configures the constant bit rate (CBR) for the ATM circuit emulation service (CES) for an ATM permanent virtual circuit (PVC) on the Cisco MC3810
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces initial-delay	Configures the size of the receive buffer of a CES circuit.
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the number of user octets per cell for the ATM CES.
ces service	Configures the ATM circuit emulation service (CES) type.
encapsulation atm-ces	Enables CES ATM encapsulation on the Cisco MC3810.

ces clockmode synchronous

To enable the ATM CES synchronous clock mode, use the ces clockmode synchronous interface configuration command. Use the no form of this command to restore the default.

ces clockmode synchronous
no ces clockmode synchronous

Syntax Description

This command has no arguments or keywords.

Defaults

ATM CES synchronous clock mode is enabled.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

This command synchronizes the ATM CES clocking to the transmit clock source of the CBR interface. This command is supported on serial ports 0 and 1 when set for CES ATM encapsulation.

Examples

The following example sets the ATM CES clock to synchronous mode on serial port 0:

interface serial 0

 ces clockmode synchronous

Related Commands

Command	Description
encapsulation atm-ces	Enables CES ATM encapsulation on the Cisco MC3810.

ces connect

To map the CES service to an ATM PVC on the Cisco MC3810, use the ces connect interface configuration command. Use the no form of this command to delete the CES map to the ATM PVC.

ces connect atm-interface pvc {name | vpi | vpi/vci}
no ces connect atm-interface pvc {name | vpi | vpi/vci}

Syntax Description

atm-interface	Number of the ATM interface. The only valid option on the Cisco MC3810 is ATM0.
pvc	Specifies that the connection is to an ATM PVC.
name	The name of the ATM PVC.
vpi	The virtual path identifier value.
vpi/vci	The virtual channel identifier value.

Defaults

No ATM interface is defined.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

This command is supported on serial ports 0 and 1. The ATM interface must be configured to encapsulation atm-ces, and the vpi and vpi/vci must be defined on the interface.

Examples

The following example maps the CES service to PVC 20 on ATM port 0:

ces connect atm0 pvc 20

Related Commands

Command	Description
cbr	Configures the constant bit rate (CBR) for the ATM circuit emulation service (CES) for an ATM permanent virtual circuit (PVC) on the Cisco MC3810
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period.
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces initial-delay	Configures the size of the receive buffer of a CES circuit.
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the number of user octets per cell for the ATM CES.
ces service	Configures the ATM circuit emulation service (CES) type.
encapsulation atm-ces	Enables CES ATM encapsulation on the Cisco MC3810.

ces initial-delay

To configure the size of the receive buffer of a CES circuit, use the ces initial-delay interface configuration command. Use the no form of this command to remove the initial-delay value.

ces initial-delay bytes
no ces initial-delay bytes

Syntax Description

bytes

The size of the receive buffer of the CES circuit in bytes. The valid range is 1 to 16000. This command is used to accommodate cell jitter on the network. Bytes received from the ATM network are buffered by this amount before being sent to the CES port.

Defaults

The CES circuit receive buffer holds 4000 bytes.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

Examples

The following example configures the receive buffer of the CES circuit to 8000 bytes:

ces initial-delay 8000

Related Commands

Command	Description
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period.
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the number of user octets per cell for the ATM CES.
ces service	Configures the ATM circuit emulation service (CES) type.

ces max-buf-size

To configure the transmit buffer of a CES circuit, use the ces max-buf-size interface configuration command. Use the no form of this command to delete the CES transmit buffer size.

ces max-buf-size size
no ces max-buf-size size

Syntax Description

size	Maximum size of the transmit buffer for the CES in bytes. Possible values are 80 to 1520. The default is 256.

Defaults

The CES circuit transmit buffer holds 256 bytes.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

Using this command, incoming bytes received on a CES port are buffered by the amount configured, and transmitted to the AAL1 process as a block of data.

This command is supported on serial ports 0 and 1 when the encapsulation atm-ces command is enabled.

Examples

The following example configures the maximum CES transmit buffer size to 1520:

ces max-buf-size 1520

Related Commands

Command	Description
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period.
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the number of user octets per cell for the ATM CES.
ces service	Configures the ATM circuit emulation service (CES) type.

ces partial-fill

To configure the number of user octets per cell for the ATM CES, use the ces partial-fill interface configuration command. Use the no form of this command to delete the CES partial-fill value.

ces partial-fill octet
no ces partial-fill octet

Syntax Description

octet

Number of user octets per cell for the CES. Possible values of octet are 0 to 47. Setting this number to zero disables partial cell fill and causes all cells to be completely filled before they are sent.

Defaults

ATM CES is configured for 47 octets per cell.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

Setting the value of the ces partial-fill command to zero disables partial cell fill and causes all cells to be completely filled before they are sent. This command is supported on serial ports 0 and 1 when the encapsulation atm-ces command is enabled.

Examples

The following example sets the CES partial cell fill to 20 octets per cell for serial port 0:

interface serial 0

 ces partial-fill 20

Related Commands

Command	Description
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period.
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces initial-delay	Configures the size of the receive buffer of a CES circuit
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces service	Configures the ATM circuit emulation service (CES) type.
encapsulation atm-ces	Enables CES ATM encapsulation on the Cisco MC3810.

ces service

To enable structured ATM CES service, use the ces service interface configuration command. Use the no form of this command to restore the default.

ces service structured
no ces service structured

Syntax Description

structured

Specifies that the ATM CES type is structured. Structured is the only option supported.

Defaults

Structured

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

This command is supported on serial ports 0 and 1 when the encapsulation atm-ces command is enabled.

Examples

The following example sets the CES service to structured for serial port 0:

interface serial 0

 ces service structured

Related Commands

Command	Description
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period.
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces initial-delay	Configures the size of the receive buffer of a CES circuit
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the ATM circuit emulation service (CES) type

compress

To specify compression for the voice connection on an ATM permanent virtual circuit (PVC) for the Cisco MC3810, use the compress ATM virtual circuit configuration command. Use the no form of this command to turn off compression.

compress
no compress

Syntax Description

This command has no arguments or keywords.

Defaults

Compression is not enabled.

Command Mode

ATM virtual circuit configuration

Command History

Release	Modification
12.0	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

Examples

The following example configures ATM PVC 20 to support voice compression:

pvc 20

 compress

encapsulation

To configure the ATM adaptation layer (AAL) and encapsulation type for an ATM PVC class, use the encapsulation command in the appropriate command mode. Use the no form of this command to remove an encapsulation from a PVC class.

encapsulation aal-encap
no encapsulation aal-encap

---

Note   This document only describes encapsulation settings for Voice over ATM and Frame Relay-Interworking on the Cisco MC3810. For the full syntax of the encapsulation command, refer to the Cisco IOS Wide Area Networking Command Reference. The Cisco MC3810 does not support SVCs or VC classes.

---

Syntax Description

aal-encap

ATM adaptation layer (AAL) and encapsulation type. When aal5mux is specified, a protocol is required. Possible values for aal-encap are as follows: •aal5mux frame—For a MUX-type virtual circuit for Frame Relay-ATM Interworking on the Cisco MC3810. •aal5mux voice—For a MUX-type virtual circuit for Voice over ATM on the Cisco MC3810. •aal5snap—The only encapsulation supported for Inverse ARP. Logical Link Control/Subnetwork Access Protocol (LLC/SNAP) precedes the protocol datagram.

Defaults

The global default encapsulation is aal5snap. See the "Usage Guidelines" section for other default characteristics.

Command Mode

Interface-ATM-VC configuration (for an ATM PVC or SVC)

Command History

Release	Modification
11.3 T	This command was first introduced.
12.0	This command superseded the encapsulation atm command for the Cisco MC3810, and the aal5mux frame and aal5mux voice suboptions appeared.

Usage Guidelines

Use one of the aal5mux encapsulation options to dedicate the specified PVC to a single protocol; use the aal5snap encapsulation option to multiplex two or more protocols over the same PVC. Whether you select aal5mux or aal5snap encapsulation might depend on practical considerations, such as the type of network and the pricing offered by the network. If the network's pricing depends on the number of PVCs set up, aal5snap might be the appropriate choice. If pricing depends on the number of bytes transmitted, aal5mux might be the appropriate choice because it has slightly less overhead.

If you specify virtual template parameters after the ATM PVC is configured, you should issue a shutdown command followed by a no shutdown command on the ATM subinterface to restart the interface, causing the newly configured parameters (such as an IP address) to take effect.

Examples

The following example configures a PVC to support encapsulation for Voice over ATM on the Cisco MC3810:

pvc 20

 encapsulation aal5mux voice

The following example configures a PVC to support encapsulation for Frame Relay-ATM Interworking on the Cisco MC3810:

pvc 21

 encapsulation aal5mux frame

encapsulation atm

Use the encapsulation atm command to enable ATM encapsulation. Use the no form of this command to disable ATM encapsulation.

In Cisco IOS Releases prior to 12.0:

encapsulation atm
no encapsulation atm

In Cisco IOS Releases 12.0 and later, this command is superseded by the encapsulation command.

Syntax Description

This command has no arguments or keywords.

Defaults

ATM encapsulation is not enabled.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.
12.0	This command was superseded by the mode atm command.

Usage Guidelines

This command is supported only on serial port 2 (the serial trunk port on the multiflex trunk module as designated in Cisco IOS 11.3 MA).

Examples

The following example configures a PVC to support encapsulation for Voice over ATM on the Cisco MC3810:

interface serial2

 encapsulation atm

Related Commands

Command	Description
mode atm	In Cisco IOS 12.0 and later, sets the mode of the T1/E1 controller for ATM and creates an ATM interface (ATM 0) on the Cisco MC3810.

encapsulation atm-ces

To enable CES ATM encapsulation on the Cisco MC3810, use the encapsulation atm-ces interface configuration command. Use the no form of this command to disable CES ATM encapsulation.

encapsulation atm-ces
no encapsulation atm-ces

Syntax Description

This command has no arguments or keywords.

Defaults

CES ATM encapsulation is not enabled.

Command Mode

Interface configuration

Command History

Release	Modification
11.3 MA	This command was first introduced.

Usage Guidelines

This command applies to ATM configuration on the Cisco MC3810.

This command is only supported on serial ports 0 and 1.

Examples

The following example enables CES ATM encapsulation on serial port 0 on the Cisco MC3810:

interface serial 0

 encapsulation atm-ces

Related Commands

Command	Description
ces cell-loss-integration-period	Sets the circuit emulation service (CES) cell-loss integration period
ces clockmode synchronous	Configures the ATM CES synchronous clock mode.
ces connect	Maps the CES service to an ATM PVC on the Cisco MC3810.
ces initial-delay	Configures the size of the receive buffer of a CES circuit.
ces max-buf-size	Configures the transmit buffer of a CES circuit.
ces partial-fill	Configures the number of user octets per cell for the ATM CES.
ces service	Configures the ATM circuit emulation service (CES) type.

loopback

To place a Cisco MC3810 ATM interface into loopback mode, use the loopback interface configuration command. Use the no form of this command to remove the loopback.

loopback [diagnostic | line]
no loopback [diagnostic | line]

Syntax Description

diagnostic	(Optional) Places the interface into internal loopback at the physical layer interface module (PLIM).
line	(Optional) Places the interface into external loopback at the line. Packets loop from the ATM interface back to the ATM network. This is the default if no keyword is entered.

Defaults

The ATM interface is not in loopback mode.

Command Mode

Interface configuration

Command History

Release	Modification
11.0	This command was first introduced.
11.3(1) MA	This command became operational for Voice over ATM on the Cisco MC3810.

Usage Guidelines

This command is useful for testing, because it loops all packets from the ATM interface back to the ATM interface, in addition to directing the packets to the network.

Examples

The following example loops all packets back to the ATM interface on ATM interface 0:

interface atm0

 loopback line

Related Commands

Command	Description
loop-detect	Enables loop detection on a T1 interface.

pvc

Use the pvc interface configuration command to do one or more of the following:

•Create an ATM PVC on a main interface or subinterface.

•Assign a name to an ATM PVC.

•Specify ILMI, QSAAL, or SMDS as the encapsulation type on an ATM PVC. (To configure other encapsulation types, see the encapsulation command).

•Enter interface-ATM-VC configuration mode.

To remove an ATM PVC, use the no form of this command.

pvc [name] vpi/vci [ilmi | qsaal | smds]

no pvc [name] vpi/vci [ilmi | qsaal | smds]

Syntax Description

name	(Optional) The name of the PVC or map. The name can be up to 16 characters long.
vpi/	ATM network virtual path identifier (VPI) for this PVC. The absence of the "/" and a vpi value defaults the vpi value to 0. On the Cisco MC3810 series concentrators, this value ranges from 0 to 255. The arguments vpi and vci cannot both be set to 0; if one is 0, the other cannot be 0.
vci	ATM network virtual channel identifier (VCI) for this PVC. This value ranges from 0 to 1 less than the maximum value set for this interface by the atm vc-per-vp command. Typically, lower values 0 to 31 are reserved for specific traffic (for example, F4 OAM, SVC signaling, ILMI, and so on) and should not be used. The VCI is a 16-bit field in the header of the ATM cell. The VCI value is unique only on a single link, not throughout the ATM network, because it has local significance only. The arguments vpi and vci cannot both be set to 0; if one is 0, the other cannot be 0.
ilmi	(Optional) Used to set up communication with the ILMI; the associated vpi and vci values are ordinarily 0 and 16, respectively.
qsaal	(Optional) A signaling-type PVC used for setting up or tearing down SVCs; the associated vpi and vci values are ordinarily 0 and 5, respectively.
smds	(Optional) Encapsulation for SMDS networks. If you are configuring an ATM PVC on the ATM Interface Processor (AIP), you must configure AAL3/4SMDS using the atm aal aal3/4 command before specifying smds encapsulation. If you are configuring an ATM network processor module (NPM), the atm aal aal3/4 command is not required. SMDS encapsulation is not supported on the ATM port adapter.

Defaults

No PVC is defined. When a PVC is defined, the global default of the encapsulation command applies (aal-encap = aal5snap).

Command Mode

Interface configuration

Command History

Release	Modification
11.3 T	This command was first introduced.
12.0	This command superseded the atm pvc command.

Usage Guidelines

The Cisco IOS software dynamically creates rate queues as necessary to satisfy the requests of the pvc commands.

The pvc command creates a PVC and attaches it to the VPI and VCI specified. The vpi and vci arguments cannot both be simultaneously specified as 0; if one is 0, the other cannot be 0.

When configuring an SVC, use the pvc command to configure the PVC that handles SVC call setup and termination. In this case, specify the qsaal keyword. See the second example that follows.

Once you specify a name for a PVC, you can reenter the interface-ATM-VC configuration mode by simply entering pvc name. You can remove a PVC and any associated parameters by entering no pvc name or no pvc vpi/vci.

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Note   After configuring the parameters for an ATM PVC, you must exit the interface-ATM-VC configuration mode in order to create the PVC and enable the settings.

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If ilmi, qsaal, or smds encapsulation is not explicitly configured on the ATM PVC, the PVC inherits the following default configuration (listed in order of precedence):

•Configuration of the encapsulation command in a VC class assigned to the PVC itself.

•Configuration of the encapsulation command in a VC class assigned to the PVC's ATM subinterface.

•Configuration of the encapsulation command in a VC class assigned to the PVC's ATM main interface.

•Global default: The global default of the encapsulation command applies. aal-encap = aal5snap.

Examples

The following example creates a PVC with VPI 0 and VCI 16, and communication is set up with the ILMI:

pvc cisco 0/16 ilmi

  exit

The following example creates a PVC used for ATM signaling for an SVC. It specifies VPI 0 and VCI 5:

pvc cisco 0/5 qsaal

  exit

Related Commands

Command	Description
atm vc-per-vp	Sets the maximum number of VCIs to support per VPI.

vbr-rt

To configure the real-time variable bit rate (VBR) for voice connections on the Cisco MC3810, use the vbr-rt ATM virtual circuit configuration command. Use the no form of this command to restore the default.

vbr-rt peak-rate average-rate burst
no vbr-rt

Syntax Description

peak-rate	The peak information rate (PIR) of the voice connection in kbps. The range is 56 to 10000.
average-rate	The average information rate (AIR) of the voice connection in kbps. The range is 1 to 56.
burst	Burst size in number of cells. The range is 0 to 65536.

Defaults

No vbr-rt settings are configured.

Command Mode

ATM virtual circuit configuration

Command History

Release	Modification
12.0	This command was first introduced.

Usage Guidelines

This command applies to Voice over ATM on the Cisco MC3810.

The vbr-rt command configures traffic shaping between voice and data PVCs. Traffic shaping is required so that the carrier does not discard calls. To configure voice and data traffic shaping, you must configure the peak, average, and burst options for voice traffic. Configure the burst value if the PVC will be carrying bursty traffic. The peak, average, and burst values are needed so the PVC can effectively handle the bandwidth for the number of voice calls. To calculate the minimum peak, average, and burst values for the number of voice calls, use the following calculations:

•Peak value: (2 x the maximum number of calls) x 16 kb

•Average value: (1 x the maximum number of calls) x 16 kb

•Burst value: (4 x the maximum number of calls)

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Note   When you configure data PVCs that will be traffic shaped with voice PVCs, use the aalsnap encapsulation and calculate the overhead as 1.13 times the voice rate.

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Examples

The following example configures the traffic shaping rate for ATM PVC 20 on a Cisco MC3810. In the example, the peak, average and burst rates are calculated based on a maximum of 20 calls on the PVC.

pvc 20

 encapsulation aal5mux voice

 vbr-rt 640 320 80

Related Commands

Command	Description
encapsulation	Configures the ATM adaptation layer (AAL) and encapsulation type for an ATM PVC class