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Configuring Circuit Emulation Services

Configuring Circuit Emulation Services

This chapter describes circuit emulation services (CES) and how to configure the CES T1/E1 port adapters in the Catalyst 8540 MSR, Catalyst 8510 MSR, and LightStream 1010 ATM switch routers. You can use CES T1/E1 port adapters for links that require constant bit rate (CBR) services.

Note This chapter provides advanced configuration instructions for the Catalyst 8540 MSR, Catalyst 8510 MSR, and LightStream 1010 ATM switch routers. For an overview of CES applications and operation, refer to the Guide to ATM Technology. For complete descriptions of the commands mentioned in this chapter, refer to the ATM Switch Router Command Reference publication. For hardware installation and cabling instructions, refer to the ATM Port Adapter and Interface Module Installation Guide.

This chapter includes the following sections:

Overview of CES T1/E1 Interfaces

You can use CES T1/E1 port adapters for links that require CBR services, such as interconnecting Private Branch Exchanges (PBXs), time-division multiplexers (TDMs), and video conference equipment over campus, public, or private networks.

This section provides an overview of the hardware features and functions supported on the CES T1/E1 port adapters.

Clocking Options

You can configure each interface on the port adapter to support the following clocking options:

Interfaces Supported

The number of CES T1/E1 interfaces you can configure is platform dependent:

Connectors Supported

The CES T1 port adapters support UTP connectors and the CES E1 port adapters support UTP, foil twisted-pair (FTP), or 75-ohm BNC connectors. Status and carrier-detect LEDs on each port give quick, visual indications of port status and operation. For detailed network management support, comprehensive statistics gathering and alarm monitoring capabilities are provided.

Functions Supported by CES Modules

The functions supported by a CES module include the following:

Framing Formats and Line Coding Options for CES Modules

The CES modules support the framing formats and line coding options shown in Table 18-1.


Table 18-1: CES Module Framing and Line Coding Options
Module Framing Options/Description Line Coding Options

CES T1 port adapter

  • Super Frame (SF)

  • Extended Super Frame (ESF)

ami or b8zs
(b8zs is the default)

CES E1 port adapter (120-ohm)
and
CES E1 port adapter (BNC)

  • E1 CRC multiframe (e1_crc_mf_lt).

Configures the line type to e1_crc_mf, without channel associated signalling (CAS) enabled.

  • E1 CRC multiframe (e1_crc_mfCAS_lt).

Configures the line type to e1_crc_mf, with CAS enabled.

  • E1 (e1_lt).

Configures the line type to e1_lt.

  • E1 multiframe (e1_mfCAS_lt).

Configures the line type to e1_mf, with CAS enabled.

ami or hdb3
(hdb3 is the default)

Default CES T1/E1 Interface Configuration

The following defaults are assigned to all CES T1/E1 interfaces:

The following defaults are assigned to CES T1 port adapters:

The following defaults are assigned to CES E1 port adapters:

Configuring CES T1/E1 Interfaces

To manually change any of the CES T1/E1 default configuration values, enter the interface cbr global configuration command to specify a CBR interface, as follows:

interface cbr card/subcard/port

To configure the CES T1/E1 interfaces perform the following command, beginning in global configuration mode:

Command Purpose

ces aal1 clock {adaptive | srts | synchronous}

Configures the type of clocking.

Note For structured CES, the default is synchronous.

ces aal1 service {structured | unstructured}

Configures the service type. The default is unstructured.

ces circuit circuit-id [cas] [cdv max-req]
[circuit-name name] [partial-fill number]
[shutdown] [timeslots number]
[on-hook-detect pattern]

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For unstructured service, use 0.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

  • Enables channel-associated signalling for structured service only. The default is no cas.

  • Enables the peak-to-peak cell delay variation requirement. The range is 1 through 65535 milliseconds. The default is 2000 milliseconds.

  • Sets the ASCII name for the CES-IWF circuit. The maximum characters is 64. The default is CBRx/x/x:0.

  • Enables the partial AAL1 cell fill service for structured service only. The range is
    20 through 47. The default is 47.

  • Disables the circuit. The default is no shutdown.

  • Configures the time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

  • Configures on-hook detection.

ces dsx1 clock source {loop-timed | network-derived}

Configures the clock source. The default is network-derived.

Configures the framing type.

  • For CES T1, the default is esf.

  • For CES E1, the default is e1_lt.

ces dsx1 lbo {0_110 | 110_220 | 220_330 | 330_440 | 440_550 | 550_660 | 660_above | square_pulse}

Configures the line build-out. The default is 0_110.

ces dsx1 linecode {ami | b8zs | hdb3}

Configures the line code type.

  • For CES T1, the default is b8zs.

  • For CES E1, the default is hdb3.

ces dsx1 loopback {line | noloop | payload}

Configures the loopback test method. The default is noloop.

ces dsx1 signalmode robbedbit

Configures the signal mode to robbedbit. The default is no.

  • To configure the destination port for the circuit and configure a hard PVC:

ces pvc circuit-id {interface atm card/subcard/port
vpi vpi vci vci}

  • To configure the destination port for the circuit and configure a soft PVC:

ces pvc circuit-id {dest-address atm-address
[vpi vpi | vci vci]
[retry-interval [first retry-interval]
[maximum retry-interval]]}

Configures the destination port for the circuit and configures a hard PVC, as follows:

  • Specifies the circuit identification.

    • For unstructured service, use 0.

    • For T1 structured service, use 1 through 24.

    • For E1 structured service, use 1 through 31.

  • Specifies the card/subcard/port number of the ATM interface.

  • Specifies the virtual path identifier of the destination PVC.

  • Specifies the virtual channel identifier of the destination PVC.

Configures the destination port for the circuit and configures the soft PVC, as follows:

  • Specifies the circuit identification.

    • For unstructured service, use 0.

    • For T1 structured service, use 1 through 24.

    • For E1 structured service, use 1 through 31.

  • Specifies the destination address of the soft PVC.

  • Specifies the virtual path identifier of the destination PVC.

  • Specifies the virtual channel identifier of the destination PVC.

  • Configures retry interval timers for a soft PVC, as follows:

    • Specifies in milliseconds, the retry interval after the first failed attempt. The range is
      100 to 3,600,000 milliseconds. The default is 5,000 milliseconds.

    • Specifies in seconds, the maximum retry interval between any two attempts. The range is 1 to 65,535. The default is 60.

Examples

The following example shows how to change the default cell delay variation for circuit 0 to 30,000, using the ces circuit command:

Switch# configure terminal
Switch(config)# interface cbr 3/0/0
Switch(config-if)# shutdown
Switch(config-if)# ces circuit 0 cdv 3000
Switch(config-if)# no shutdown
Note You might have to use the shutdown command to shut down the interface before you can modify the circuit. After modifying the circuit, use the no shutdown command to reenable the interface.

The following example shows how to change the default CBR interface framing mode to super frame, using the ces dsx1 framing command:

Switch# configure terminal
Switch(config)# interface cbr 3/0/0
Switch(config-if)#  ces dsx1 framing sf

The following example shows how to change the default CBR interface line build-out to 330 to 440 feet, using the ces dsx1 lbo command:

Switch# configure terminal
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces dsx1 lbo 330_440

The following example shows how to change the default CBR interface line code method to binary 8 zero suppression, using the ces dsx1 linecode command:

Switch# configure terminal
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces dsx1 linecode b8zs

The following example shows how to change the default CBR interface loopback method to payload, using the ces dsx1 loopback command:

Switch# configure terminal
Switch(config)# interface cbr 3/0/0
Switch(config-if)# ces dsx1 loopback payload

See the section "Troubleshooting the Interface Configuration" in the chapter "Configuring Interfaces" to confirm your interface configuration.

General Guidelines for Creating Soft PVCs for Circuit Emulation Services

You can create either hard private virtual circuits (PVCs) or soft PVCs for unstructured or structured CES, depending on your particular CES application requirements. The main difference between hard and soft PVCs is rerouting in case of failure, as follows:

This section provides general guidelines for configuring soft PVCs for CES modules. For specific instructions for configuring both hard and soft PVCs, see the following sections:

Note The steps in these guidelines assume that you have already used the ces circuit commands to configure circuits on the CES interfaces. If you have not yet configured circuits on the CES interfaces, the show ces address command will not display any addresses. For simplicity, the steps in these guidelines describe how to create a soft PVC between interface modules in the same ATM switch router.

To configure soft PVCs for either unstructured or structured circuit emulation services, follow these steps:

Step 1 Determine which CES interfaces are currently configured in your ATM switch router chassis, using the show ces status command in privileged EXEC mode.

CESwitch# show ces status
   Interface      IF      Admin        Port  Channels in
     Name       Status   Status        Type      use
------------- -------- --------- ----------- -----------
     CBR3/0/0       UP        UP          T1
     CBR3/0/1     DOWN        UP          T1
     CBR3/0/2     DOWN        UP          T1
     CBR3/0/3       UP        UP          T1

Step 2 Determine which two ports you want to define as participants in the soft PVC.

Step 3 Decide which of the two ports you want to designate as the destination (or passive) side of the soft PVC.

Step 4 Configure the destination (passive) side of the soft PVC. You must configure the destination end of the soft PVC first, as this end defines a CES-IWF ATM address for that circuit.

CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/1
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-B

Step 5 Retrieve the CES-IWF ATM address of the soft PVC's destination end, using the show ces address command. The following example shows how to display the CES-IWF ATM address and VPI/VCI for a CES circuit:

CESwitch# show ces address
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.10  CBR-PVC-A vpi 0 vci 16
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1030.20  CBR-PVC-AC vpi 0 vci 1056
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B vpi 0 vci 1040
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1038.10  CBR-PVC-CA vp1 0 vci 3088

Step 6 Configure the source (active) end of the soft PVC last, using the information derived from Step 5. You must configure the source end of the soft PVC last, because that end not only defines the configuration information for the source port, but also requires you to enter the CES-IWF ATM address and VPI/VCI values for the destination circuit.

CESwitch(config)# interface cbr 3/0/0
CESwitch(config)# ces circuit 0
CESwitch(config-if)# ces pvc 0 dest-address 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0 vci 1040

Step 7 To verify that the CES circuits are up on both sides (source and destination), run the show ces interface command. To verify that the soft PVC was established between two switches, run the show atm vc interface command.

Configuring T1/E1 Unstructured Circuit Emulation Services

This section provides an overview of unstructured (clear channel) circuit emulation services and describes how to configure CES modules for unstructured circuit emulation services.

Overview of Unstructured Circuit Emulation Services

Unstructured circuit emulation services in an ATM switch router network emulate point-to-point connections over T1/E1 leased lines. This service maps the entire bandwidth necessary for a T1/E1 leased line connection across the ATM network, allowing users to interconnect PBXs, TDMs, and video conferencing equipment.

For a detailed description of unstructured circuit emulation services, refer to the Guide to ATM Technology.

The circuit you set up on a CBR port for unstructured service is always identified as circuit 0, because you can establish only one unstructured circuit on any given CBR port. An unstructured circuit uses the entire bandwidth of a T1 port (1.544 Mbps) or an E1 port (2.048 Mbps).

The procedures for configuring CES modules for unstructured circuit emulation services are described in the following subsections:

Configuring Network Clocking for Unstructured CES

Circuit emulation services require that the network clock be configured properly. Unstructured services can use synchronous, Synchronous Residual Time Stamp (SRTS), or adaptive clocking mode. For instructions on configuring network clocking, see the section "Configuring Network Clocking" in the chapter "Initially Configuring the ATM Switch Router." For a discussion of clocking issues and network examples, refer to the network clock synchronization and network clocking for CES topics in the Guide to ATM Technology.

Configuring Synchronous Clocking With an OC-12c Interface Module

When synchronous clocking is being used and propagated via an OC-12c interface module, be sure to use the following configurations:

Configuring a Hard PVC for Unstructured CES

A CES module converts CBR traffic into ATM cells for propagation through an ATM network. CBR traffic arriving on a CES module port must first be segmented into ATM cells. This cell stream is then directed to an outgoing ATM or CBR port.

Note As a general rule when configuring a hard PVC, you must interconnect a CBR port and an ATM port in the same ATM switch router chassis.

Figure 18-1 displays unstructured circuit emulation services configured on an ATM switch router, using ATM and CES interface modules to create a hard PVC. In this example, the hard PVC also uses adaptive clocking, and this CES circuit enables bidirectional, unstructured CBR traffic to flow between these two modules.


Figure 18-1: Hard PVC Configured for Unstructured CES


To configure a hard PVC for unstructured CES, follow these steps, beginning in privileged EXEC mode.
Step Command Purpose

1 .

show ces status

Displays information about the current CBR interfaces.

Use this command to choose the source CBR port.

2 . 

show atm status

Displays information about the current ATM interfaces.

Use this command to choose the destination ATM port.

Note The interface must be up.

3 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

4 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

5 . 

ces aal1 clock {adaptive | srts | synchronous}

Configures the AAL1 clock mode.

6 . 

ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

7 . 

ces circuit circuit-id circuit-name name

Configures the CES interface circuit identifier and circuit name.

Note For unstructured service, use 0 for the circuit identifier.

8 . 

ces pvc circuit-id interface atm card/subcard/port vpi vpi vci vci

Configures the hard PVC to the ATM interface and VPI/VCI.

Note The VPI/VCI are arbitrary here. They are not fixed, whereas the VPI/VCI described in the "General Guidelines for Creating Soft PVCs for Circuit Emulation Services" section are fixed.

Example

The following example shows how to configure the hard PVC for unstructured CES (shown in Figure 18-1):

CESwitch# show ces status
 
   Interface      IF      Admin        Port  Channels in
     Name       Status   Status        Type      use
------------- -------- --------- ----------- -----------
     CBR3/0/0       UP        UP          T1
     CBR3/0/1     DOWN        UP          T1
     CBR3/0/2     DOWN        UP          T1
     CBR3/0/3       UP        UP          T1
 
CESwitch# show atm status
 
NUMBER OF INSTALLED CONNECTIONS: (P2P=Point to Point, P2MP=Point to MultiPoint,
MP2P=Multipoint to Point)
 
Type     PVCs SoftPVCs     SVCs     TVCs     PVPs SoftPVPs     SVPs      Total
P2P        27        2       13        0        0        0        0         42
P2MP        0        0        2        0        0        0        0          2
MP2P        0        0        0        0        0        0        0          0
                                      TOTAL INSTALLED CONNECTIONS =         44
 
PER-INTERFACE STATUS SUMMARY AT 18:12:45 UTC Thu Jul 22 1999:
   Interface      IF         Admin  Auto-Cfg    ILMI Addr     SSCOP    Hello
     Name       Status      Status    Status    Reg State     State    State
------------- -------- ------------ -------- ------------ --------- --------
ATM0/0/1          DOWN         down  waiting          n/a      Idle      n/a
ATM0/0/5          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/6          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/7          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/ima1         UP           up     done  UpAndNormal    Active 2way_in
ATM0/1/0          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/1          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/2          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/3          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/7          DOWN         down  waiting          n/a      Idle      n/a
ATM0/1/ima2         UP           up     done  UpAndNormal    Active 2way_in
ATM1/0/0          DOWN         down  waiting          n/a      Idle      n/a
ATM1/0/1          DOWN         down  waiting          n/a      Idle      n/a
ATM1/0/2          DOWN         down  waiting          n/a      Idle      n/a
ATM1/0/3            UP           up     done  UpAndNormal    Active      n/a
ATM1/1/0            UP           up     done  UpAndNormal    Active      n/a
ATM1/1/1          DOWN         down  waiting          n/a      Idle      n/a
ATM1/1/2          DOWN         down  waiting          n/a      Idle      n/a
ATM1/1/3          DOWN         down  waiting          n/a      Idle      n/a
ATM2/0/0            UP           up      n/a  UpAndNormal      Idle      n/a
ATM-P3/0/3          UP           up  waiting          n/a      Idle      n/a
ATM3/1/0          DOWN         down  waiting          n/a      Idle      n/a
ATM3/1/1            UP           up     done  UpAndNormal    Active 2way_in
ATM3/1/1.99         UP           up     done  UpAndNormal    Active 2way_in
ATM3/1/2          DOWN         down  waiting          n/a      Idle      n/a
ATM3/1/3          DOWN         down  waiting          n/a      Idle      n/a
ATM-P4/0/0          UP           up  waiting          n/a      Idle      n/a
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/0 
CESwitch(config-if)# ces aal1 clock adaptive 
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-A 
CESwitch(config-if)# ces pvc 0 interface atm 0/1/3 vpi 0 vci 100

Verifying a Hard PVC for Unstructured CES

To verify the hard PVC configuration, use the following privileged EXEC commands:
Command Purpose

show ces circuit

Shows configuration information for the hard PVC.

show ces circuit interface cbr card/subcard/port circuit-id

Shows detailed interface configuration information for the hard PVC.

Examples

The following example shows how to display the basic information about the hard PVC shown in Figure 18-1, using the show ces circuit command: 

CESwitch# show ces circuit
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/0/0    0       HardPVC           ATM0/1/3      0       100  UP

The output from this command verifies the source (CBR 3/0/0) and destination (ATM 0/1/3) port IDs of the hard PVC and indicates that the circuit is up.

The following example shows how to display detailed information about the hard PVC shown in Figure 18-1, using the show ces circuit interface command:

CESwitch# show ces circuit interface cbr 3/0/0 0
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/0, Circuit_id 0, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_ADAPT
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x100 (vci = 16)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow 903952, OverFlow 0
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      827, startDequeueDepth      437
Partial Fill:       47, Structured Data Transfer 0
HardPVC
src: CBR3/0/0 vpi 0, vci 16
Dst: ATM0/1/3 vpi 0, vci 100

The output from this command verifies the following configuration information:

Configuring a Soft PVC for Unstructured CES

In a soft PVC, as well as a hard PVC, you configure both ends of the CES circuit. However, a soft PVC typically involves CES modules at opposite edges of an ATM network, so a soft PVC can be set up between any two CES modules anywhere in your network.

The destination address of a soft PVC can point to either of the following:

For example, to set up a soft PVC involving a local node and a destination node at the opposite edge of the network, you need to determine the CES-IWF ATM address of the port in the destination node to complete soft PVC setup.

To obtain the destination address (dest-address) for a port already configured in a CES port adapter, log into the remote ATM switch router containing that module. Then use the show ces address command to display all the CES-IWF ATM addresses currently configured for that node.

Figure 18-2 displays a soft PVC configured for unstructured CES. The soft PVC uses adaptive clocking and the source clock is network-derived.

Note Typically you will configure a soft PVC between CES modules anywhere in your network. For simplicity, this example and the accompanying procedure describe how to create a soft PVC between modules in the same ATM switch router chassis.

Figure 18-2: Soft PVC Configured for Unstructured CES


Configuring a soft PVC for unstructured CES is a two-phase process:

Phase 1---Configuring the Destination (Passive) Side of the Soft PVC

To configure the destination (passive) side of a soft PVC destination port, follow these steps, beginning in privileged EXEC mode:
Step Command Purpose

1 . 

show ces status

Displays information about current CBR interfaces.

Use this command to choose the destination port.

2 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

3 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

4 . 

ces aal1 clock {adaptive | srts | synchronous}

Configures the CES interface AAL1 clock mode.

5 . 

ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

6 . 

ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

7 . 

ces circuit circuit-id circuit-name name

Configures the CES interface circuit identifier and circuit name.

Note For unstructured service, use 0 for the circuit identifier.

Example

The following example shows how to configure the destination (passive) side of a soft PVC, as shown in Figure 18-2:

CESwitch# show ces status
 
   Interface      IF      Admin        Port  Channels in
     Name       Status   Status        Type      use
------------- -------- --------- ----------- -----------
     CBR3/0/0       UP        UP          T1
     CBR3/0/1       UP        UP          T1
     CBR3/0/2       UP        UP          T1
     CBR3/0/3       UP        UP          T1
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/1
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-B
Note If you do not specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR3/0/1:0.

Phase 2---Configuring the Source (Active) Side of the Soft PVC

To configure the source (active) side of a soft PVC destination port, follow these tasks, beginning in privileged EXEC mode:
Step Command Purpose

1 . 

show ces address

Shows the CES address and VPI/VCI for the destination end of the circuit.

Use this command to retrieve the destination's VPI/VCI.

2 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

3 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

4 . 

ces circuit circuit-id circuit-name name

Configures the CES interface circuit identifier and circuit name.

Note For unstructured service, use 0 for the circuit identifier.

5 . 

ces pvc circuit-id dest-address remote_atm_address vpi vpi vci vci

Configures the soft PVC to the destination CES-IWF ATM addresses and VPI/VCI of the circuit.

Note Use the destination's VPI/VCI, which you retrieved in Step 1.

Example

The following example shows how to configure the source (active) side of a soft PVC, as shown in Figure 18-2:

      CESwitch# show ces address 
 
CES-IWF ATM Address(es):
47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10  CBR-PVC-B
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/0
CESwitch(config)# ces circuit 0 circuit-name CBR-PVC-A
CESwitch(config-if)# ces pvc 0 dest-address 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0 vci 1040

Verifying a Soft PVC for Unstructured CES

To verify the soft PVC configuration, use the following privileged EXEC commands:
Command Purpose

show ces circuit

Shows the soft PVC configuration information.

show ces circuit interface cbr card/subcard/port circuit-id

Shows the detailed soft PVC interface configuration information.

Examples

The following example shows how to display the soft PVC configured in the previous section (shown in Figure 18-2), using the show ces circuit command:

CESwitch# show ces circuit
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/0/0    0       Active SoftVC   ATM-P3/0/3      0        16 UP
 CBR3/0/1    0       Passive SoftVC  ATM-P3/0/3      0      1040 UP

The following example shows how to display the detailed circuit information for CBR 3/0/1, the destination (passive) side of the soft PVC (shown in Figure 18-2), using the show ces circuit interface cbr command: 

CESwitch# show ces circuit interface cbr 3/0/1 0
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/1, Circuit_id 0, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0xC100 (vci = 3088)
Configured CDV 2000 usecs, Measured CDV 2378 usecs
De-jitter: UnderFlow 137, OverFlow 0
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth      823, startDequeueDepth      435
Partial Fill:       47, Structured Data Transfer 0
Passive SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10 vpi 0, vci 1040
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.00

The following example shows how to display the detailed circuit information for CBR 3/0/0, the source (active) side of the soft PVC (shown in Figure 18-2), using the show ces circuit interface cbr command: 

CESwitch# show ces circuit interface cbr 3/0/0 0
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/0, Circuit_id 0, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-24
Channels used by this circuit: 1-24
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x100 (vci = 16)
Configured CDV 2000 usecs, Measured CDV 326 usecs
De-jitter: UnderFlow 1, OverFlow 0
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      823, startDequeueDepth      435
Partial Fill:       47, Structured Data Transfer 0
Active SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.10 vpi 0, vci 16
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10

Configuring T1/E1 Structured (n x 64) Circuit Emulation Services

This section provides an overview of structured (n x 64 Kbps) circuit emulation services and describes how to configure CES modules for structured circuit emulation services.

Overview of Structured Circuit Emulation Services

An important distinction between structured and unstructured circuit emulation services is that structured circuit emulation services allow you to allocate T1/E1 bandwidth. Structured circuit emulation services only use the T1/E1 bandwidth actually required to support the active structured circuit(s) you configure.

For example, configuring a CES module for structured services allows you to define multiple hard PVCs or soft PVCs for any CES T1 or E1 port. In both module types, any bits not available for structured circuit emulation services are used for framing and out-of-band control.

n x 64 refers to a circuit bandwidth (data transmission speed) provided by the aggregation of n x 64-Kbps channels, where n is an integer greater than or equal to 1. The 64-Kbps data rate, or the DS0 channel, is the basic building block of the T carrier systems (T1, T2, and T3).

The T1/E1 structured (n x 64) circuit emulation services enable a CES module to function in the same way as a classic digital access and crossconnect system (DACS) switch.

The Simple Gateway Control Protocol (SGCP) provides similar functionality by controlling structured CES circuits for voice over ATM. For additional information see the section "Configuring SGCP" later in this chapter.

For a detailed description of structured circuit emulation services, refer to the Guide to ATM Technology.

Configuring Network Clocking for Structured CES

Circuit emulation services require that the network clock be configured properly. For structured services, synchronous clocking is required. For instructions on configuring network clocking, see the section "Configuring Network Clocking" in the chapter "Initially Configuring the ATM Switch Router." For a discussion of clocking issues and network examples, refer to the network clock synchronization and network clocking for CES topics in the Guide to ATM Technology.

Configuring Synchronous Clocking With an OC-12c Interface Module

When synchronous clocking is being used and propagated via an OC-12c interface module, be sure to use the following configurations:

Configuring a Hard PVC for Structured CES

This section describes how to configure a hard PVC for structured circuit emulation services.

Figure 18-3 shows that the hard PVC for structured CES connection is configured with the following parameters:


Figure 18-3: Hard PVC Configured for Structured CES


To configure the CES port for structured CES, follow these steps, beginning in privileged EXEC mode:
Step Command Purpose

1 . 

show ces status

Displays information about current CBR interfaces.

Use this command to choose the source port.

2 . 

show atm status

Displays information about current ATM interfaces.

Use this command to choose the destination port.

3 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

4 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

5 . 

ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

6 . 

ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

7 . 

  • For T1 framing: ces dsx1 framing {sf | esf}

  • For E1 framing: ces dsx1 framing {e1_crc_mfCAS_lt | e1_crc_mf_lt | e1_lt | e1_mfCAS_lt}

Configures the CES line type.

8 . 

  • For T1 line coding: ces dsx1 linecode
    {ami | b8zs}

  • For E1 line coding: ces dsx1 linecode
    {ami | hdb3}

Configures the line coding.

9 . 

ces circuit circuit-id timeslots number

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

Note The 0 circuit identifier is reserved for unstructured service.

  • Time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

10 . 

ces circuit circuit-id circuit-name name

Configures the CES circuit name.

11 . 

ces pvc circuit-id interface atm card/subcard/port vpi vpi vci vci

Configures the hard PVC to the ATM interface and VPI/VCI.

Example

The following example shows how to configure the hard PVC for structured T1 CES, as shown in Figure 18-3:

CESwitch# show ces status
 
   Interface      IF      Admin        Port  Channels in
     Name       Status   Status        Type      use
------------- -------- --------- ----------- -----------
     CBR3/0/0       UP        UP          T1
     CBR3/0/1       UP        UP          T1
     CBR3/0/2       UP        UP          T1
     CBR3/0/3       UP        UP          T1
 
CESwitch# show atm status
 
NUMBER OF INSTALLED CONNECTIONS: (P2P=Point to Point, P2MP=Point to MultiPoint,
MP2P=Multipoint to Point)
 
Type     PVCs SoftPVCs     SVCs     TVCs     PVPs SoftPVPs     SVPs      Total
P2P        27        2       13        0        0        0        0         42
P2MP        0        0        2        0        0        0        0          2
MP2P        0        0        0        0        0        0        0          0
                                      TOTAL INSTALLED CONNECTIONS =         44
 
PER-INTERFACE STATUS SUMMARY AT 18:12:45 UTC Thu Jul 22 1999:
   Interface      IF         Admin  Auto-Cfg    ILMI Addr     SSCOP    Hello
     Name       Status      Status    Status    Reg State     State    State
------------- -------- ------------ -------- ------------ --------- --------
ATM0/0/1          DOWN         down  waiting          n/a      Idle      n/a
ATM0/0/5          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/6          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/7          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/0/ima1         UP           up     done  UpAndNormal    Active 2way_in
ATM0/1/0          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/1          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/2          DOWN     shutdown  waiting          n/a      Idle      n/a
ATM0/1/3            UP           up     done  UpAndNormal    Active      n/a
ATM0/1/7          DOWN         down  waiting          n/a      Idle      n/a
ATM0/1/ima2         UP           up     done  UpAndNormal    Active 2way_in
ATM1/0/0          DOWN         down  waiting          n/a      Idle      n/a
ATM1/0/1          DOWN         down  waiting          n/a      Idle      n/a
ATM1/0/2          DOWN         down  waiting          n/a      Idle      n/a
ATM1/0/3            UP           up     done  UpAndNormal    Active      n/a
ATM1/1/0            UP           up     done  UpAndNormal    Active      n/a
ATM1/1/1          DOWN         down  waiting          n/a      Idle      n/a
ATM1/1/2          DOWN         down  waiting          n/a      Idle      n/a
ATM1/1/3          DOWN         down  waiting          n/a      Idle      n/a
ATM2/0/0            UP           up      n/a  UpAndNormal      Idle      n/a
ATM-P3/0/3          UP           up  waiting          n/a      Idle      n/a
ATM3/1/0          DOWN         down  waiting          n/a      Idle      n/a
ATM3/1/1            UP           up     done  UpAndNormal    Active 2way_in
ATM3/1/1.99         UP           up     done  UpAndNormal    Active 2way_in
ATM3/1/2          DOWN         down  waiting          n/a      Idle      n/a
ATM3/1/3          DOWN         down  waiting          n/a      Idle      n/a
ATM-P4/0/0          UP           up  waiting          n/a      Idle      n/a
 
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/0
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# ces dsx1 framing esf
CESwitch(config-if)# ces dsx1 linecode b8zs
CESwitch(config-if)# ces circuit 1 timeslots 1-3,7
CESwitch(config-if)# ces circuit 1 circuit-name CBR-PVC-A
CESwitch(config-if)# ces pvc 1 interface atm 0/1/3 vpi 0 vci 100
Note If you do not specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR3/0/0:1. For structured CES, the circuit number sequence always begins at 1 for each port in a CES module.

The VPI/VCI values shown in the example (vpi 0 vci 100) are for demonstration purposes only. The service provider you select gives you a virtual path for your data, but you must decide which VCI number to assign to the circuit.

Verifying a Hard PVC for Structured CES

To verify the hard PVC configured with structured services, use the following privileged EXEC commands:
Command Purpose

show ces circuit

Shows the configuration information for the hard PVC.

show ces circuit interface cbr card/subcard/port circuit-id

Shows the detailed interface configuration information for the hard PVC.

Examples

The following example shows the details of the hard PVC, shown in Figure 18-3, using the show ces circuit command:

CESwitch# show ces circuit
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/0/0    1       HardPVC           ATM0/1/3      0       100 UP

The output from this command verifies the source (CBR 3/0/0) and destination (ATM 0/1/3) port IDs of the hard PVC and indicates that the circuit is up.

The following example shows the interface details for port CBR 3/0/0 (shown in Figure 18-3), using the show ces circuit interface cbr command:

CESwitch# show ces circuit interface cbr 3/0/0 1
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/0, Circuit_id 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3, 7
Channels used by this circuit: 1-3, 7
Cell-Rate: 4107, Bit-Rate 1544000
cas OFF, cell_header 0x100 (vci = 16)
Configured CDV 2000 usecs, Measured CDV 326 usecs
De-jitter: UnderFlow 1, OverFlow 0
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcAlarm, maxQueueDepth      823, startDequeueDepth      435
Partial Fill:       47, Structured Data Transfer 1
HardPVC
Src: CBR3/0/0 vpi 0, vci 16
Dst: ATM0/1/3 vpi 0, vci 100

The output from this command verifies the following configuration information:

Configuring a Hard PVC for Structured CES with a Shaped VP Tunnel

A shaped VP tunnel is a VP tunnel that, by default, carries only VCs of the CBR service category with a peak cell rate (PCR). However, it is possible to configure a shaped VP tunnel to carry VCs of other service categories. The overall output of the shaped VP tunnel is rate-limited, by hardware, to the PCR of the tunnel.

This section describes how to configure a hard PVC for structured CES with a shaped VP tunnel, which is a two-phase process, as follows:

For more information about configuring shaped VP tunnels, refer to the section "Configuring VP Tunnels" in the chapter "Configuring Virtual Connections."

Figure 18-4 shows an example of a how a structured CES circuit can be configured with a shaped VP tunnel.


Figure 18-4: Structured CES Circuit Configured with a Shaped VP Tunnel


Phase 1---Configuring a Shaped VP Tunnel

To configure a shaped VP tunnel, follow these steps:
Step Command Purpose

1 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

2 . 

interface atm card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

3 . 

atm connection-traffic-table-row [index row-index] cbr pcr rate

Configures the connection-traffic-table-row for the desired PVP CBR cell rate.

4 . 

atm pvp vpi [hierarchical | shaped]
[rx-cttr index] [tx-cttr index]

Configures a shaped VP tunnel, as follows:

  • Specifies whether the tunnel is hierarchical or shaped.

Note To configure a shaped VP tunnel to carry PVCs of other (non-CBR) service categories, the VP tunnel must be configured as a hierarchical tunnel.

  • Specifies the connection traffic table row in the received direction. The default is 1.

  • Specifies the connection traffic table row in the transmitted direction. The default is 1.

5 . 

interface atm card/subcard/port.subinterface#

Configures a subinterface.

Note You cannot create a subinterface on the route processor interface ATM 0.

6 . 

exit

Exits subinterface mode.

Note Even though the shaped VP tunnel is defined as CBR, it can carry PVCs of another service category by substituting the new service category after the tunnel interface has been initially configured. For information about configuring VP tunnels with other (non-CBR) service categories, see the section "Configure Interface Service Category Support" in the chapter "Configuring Resource Management."
Example

The following example shows how to configure a shaped VP tunnel.

CESwitch# configure terminal
CESwitch(config)# interface atm 0/0/0
CESwitch(config)# atm connection-traffic-table-row index 10 cbr pcr 4000 CESwitch(config-if)# atm pvp 1 shaped rx-cttr 10 tx-cttr 10
CESwitch(config-if)# interface atm 0/0/0.1
CESwitch(config-subif)# exit

Note A shaped VP tunnel is defined as a CBR VP with a PCR. A maximum of 64 shaped VP tunnels can be defined on each of the following interface groups: (0/0/x, 1/0/x), (0/1/x, 1/1/x), (2/0/x, 3/0/x), (2/1/x, 3/1/x), (9/0/x, 10/0/x), (9/1/x, 10/1/x), (11/0/x, 12/0/x) and (11/1/x, 12/1/x). For further limitations on shaped VP tunnels, refer to the "Configuring a Shaped VP Tunnel" section of the "Configuring Virtual Connections" chapter.

Phase 2---Configuring a Hard PVC

To configure a hard PVC, follow these steps:
Step Command Purpose

1 . 

show ces status

Displays information about the current CBR interfaces.

Use this command to choose the source CBR port.

2 . 

show atm status

Displays information about the current ATM interfaces.

Use this command to choose the destination ATM port.

Note The interface must be up.

3 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

4 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

5 . 

ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

6 . 

ces circuit circuit-id [timeslots number]

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

Note The 0 circuit identifier is reserved for unstructured service.

  • Time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

7 . 

ces pvc circuit-id interface atm card/subcard/port vpi vpi vci vci

Configures the destination port for the circuit and configures a hard PVC, as follows:

  • Specifies the circuit identification. (Use the circuit id from the previous step.)

  • Specifies the card/subcard/port number of the ATM interface.

  • Specifies the VPI of the destination PVC.

  • Specifies the VCI of the destination PVC.

Example

The following example shows how to configure hard PVCs for the shaped VP tunnel.

CESwitch# show ces status
CESwitch# show atm status
CESwitch(config)# interface cbr 3/1/0
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces circuit 1 timeslots 1
CESwitch(config-if)# ces pvc 1 interface atm 0/0/0.1 vpi 1 vci 101
 
CESwitch(config-if)# ces circuit 2 timeslots 2
CESwitch(config-if)# ces pvc 2 interface atm 0/0/0.1 vpi 1 vci 102
 
CESwitch(config-if)# ces circuit 3 timeslots 3
CESwitch(config-if)# ces pvc 3 interface atm 0/0/0.1 vpi 1 vci 103

Verifying a Hard PVC for Structured CES with a Shaped VP Tunnel

To verify the hard PVC configuration, use the following privileged EXEC commands:
Command Purpose

show ces circuit

Shows configuration information for the hard PVC.

show ces circuit interface cbr card/subcard/port circuit-id

Shows detailed interface configuration information for the hard PVC.

Examples

The following example shows how to display the basic information about the hard PVC shown in Figure 18-4, using the show ces circuit command:

CESwitch# show ces circuit
 
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/1/0    1       HardPVC         ATM0/0/0.1      1       101  DOWN
 CBR3/1/0    2       HardPVC         ATM0/0/0.1      1       102  DOWN
 CBR3/1/0    3       HardPVC         ATM0/0/0.1      1       103  DOWN
 CBR3/1/3    0       Active SoftVC      UNKNOWN      0         0  DOWN

The following example shows how to display detailed information about the hard PVC shown in Figure 18-4, using the show ces circuit interface cbr 3/1/0 command:

CESwitch# show ces circuit interface cbr 3/1/0
 
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/1/0    1       HardPVC         ATM0/0/0.1      1       101  DOWN
 CBR3/1/0    2       HardPVC         ATM0/0/0.1      1       102  DOWN
 CBR3/1/0    3       HardPVC         ATM0/0/0.1      1       103  DOWN

Configuring a Soft PVC for Structured CES

In a soft PVC, as well as a hard PVC, you configure both ends of the CES circuit. However, a soft PVC typically involves CES modules at opposite edges of an ATM network, so a soft PVC can be set up between any two CES modules anywhere in your network.

The destination address of a soft PVC can point to either of the following:

For example, to set up a soft PVC involving a local node and a destination node at the opposite edge of the network, you need to determine the CES-IWF ATM address of the port in the destination node to complete a soft PVC setup.

To obtain the destination address for an already configured port in a CES module, log into the remote ATM switch router containing that module. Then use the show ces address command to display all the CES-IWF ATM addresses currently configured for that node.

Note Typically you will configure a soft PVC between CES modules anywhere in your network. For simplicity, this example and the accompanying procedure describe how to create a soft PVC between modules in the same ATM switch router chassis.

This section describes how to configure a soft PVC for structured service based on the following assumptions:

Figure 18-5 shows an example of a soft PVC configured for structured CES.


Figure 18-5: Soft PVC Configured for Structured CES


Configuring a soft PVC for structured CES is a two-phase process:

Phase 1---Configuring the Destination (Passive) Side of a Soft PVC

To configure a destination (passive) side of a soft PVC for structured CES, follow these steps, beginning in privileged EXEC mode:
Step Command Purpose

1 . 

show ces status

Displays information about the current CBR interfaces

Use this command to choose the destination port.

2 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

3 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

4 . 

ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

5 . 

ces dsx1 clock source {loop-timed | network-derived}

Configures the clock source.

6 . 

  • For T1 framing: ces dsx1 framing {sf | esf}

  • For E1 framing: ces dsx1 framing {e1_crc_mfCAS_lt | e1_crc_mf_lt | e1_lt | e1_mfCAS_lt}

Configures the framing type.

  • For CES T1, the default is esf.

  • For CES E1, the default is e1_lt.

7 . 

ces dsx1 linecode {ami | b8zs | hdb3}

Configures the line code type.

  • For CES T1, the default is b8zs.

  • For E1, the default is hdb3.

8 . 

ces circuit circuit-id timeslots number

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

Note The 0 circuit identifier is reserved for unstructured service.

  • Time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

9 . 

ces circuit circuit-id circuit-name name

Configures the CES interface circuit name.

Example

The following example shows how to configure the destination (passive) side of a soft PVC for structured T1 CES, as shown in Figure 18-5:

CESwitch# show ces status
 
   Interface      IF      Admin        Port  Channels in
     Name       Status   Status        Type      use
------------- -------- --------- ----------- -----------
     CBR3/0/0       UP        UP          T1
     CBR3/0/1       UP        UP          T1
     CBR3/0/2       UP        UP          T1
     CBR3/0/3       UP        UP          T1
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/3
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# ces dsx1 framing esf
CESwitch(config-if)# ces dsx1 linecode b8zs
CESwitch(config-if)# ces circuit 1 timeslots 10-13 
CESwitch(config-if)# ces circuit 1 circuit-name CBR-PVC-B

Phase 2---Configuring the Source (Active) Side of a Soft PVC

To configure the source (active) side of a soft PVC for structured CES, follow these steps, beginning in privileged EXEC mode:
Step Command Purpose

1 . 

show ces address

Shows the CES address for the destination end of the circuit.

Use this command to retrieve the VPI/VCI of the destination port.

2 . 

configure terminal

At the privileged EXEC prompt, enters global configuration mode.

3 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

4 . 

ces circuit circuit-id timeslots number

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

Note The 0 circuit identifier is reserved for unstructured service.

  • Time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

5 . 

ces circuit circuit-id circuit-name name

Configures the CES interface circuit name.

6 . 

ces pvc circuit-id dest-address remote_atm_address vpi vpi vci vci

Configures the soft PVC to the destination CES-IWF ATM addresses and VPI/VCI of the circuit.

Use the VPI/VCI of the destination port that was retrieved in Step 1.

Example

The following example shows how to configure the source (active) side of a soft PVC for structured CES, as shown in Figure 18-5:

CESwitch# show ces address
 
CES-IWF ATM Address(es):
47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10  CBR3/0/3:1  vpi 0 vci 3088
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/0
CESwitch(config-if)# ces circuit 1 timeslots 1-3, 7
CESwitch(config-if)# ces circuit 1 circuit-name CBR-PVC-A
CESwitch(config-if)# ces pvc 1 dest-address 47.0091.8100.0000.0060.5c71.1f01.4000.0c80.1034.10 vpi 0 vci 16

If you do not specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR3/0/0:1. For structured circuit emulation services, the circuit number sequence always begins at 1 for each port in a CES module.

Verifying a Soft PVC for Structured CES

To verify the soft PVC configured with structured CES, use the following EXEC commands:
Command Purpose

show ces circuit

Shows the configuration information for the soft PVC.

show ces circuit interface cbr card/subcard/port circuit-id

Shows the detailed interface configuration information for the soft PVC.

Examples

The following example shows the details of the CES circuit (shown in Figure 18-5), using the show ces circuit command:

CESwitch# show ces circuit
 
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/0/0    1       Active SoftVC   ATM-P3/0/3      0      3088  UP
 CBR3/0/3    1       Passive SoftVC  ATM-P3/0/3      0        16  UP

The following example shows the interface details for the source port (CBR 3/0/0) (shown in Figure 18-5), using the show ces circuit interface cbr command:

CESwitch# show ces circuit interface cbr 3/0/0 1
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/0, Circuit_id 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3,7
Channels used by this circuit: 1-3,7
Cell-Rate: 698, Bit-Rate 256000
cas OFF, cell_header 0x100 (vci = 16)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow unavailable, OverFlow unavailable
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       45, startDequeueDepth       28
Partial Fill:       47, Structured Data Transfer 98
Active SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.10 vpi 0, vci 16
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10

The following example shows the interface details for the destination port (CBR 3/0/3) (shown in Figure 18-5), using the show ces circuit interface cbr command:

CESwitch# show ces circuit interface cbr 3/0/3 1
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/3, Circuit_id 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 698, Bit-Rate 256000
cas OFF, cell_header 0xC100 (vci = 3088)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow unavailable, OverFlow unavailable
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       45, startDequeueDepth       28
Partial Fill:       47, Structured Data Transfer 98
Passive SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10 vpi 0, vci 3088
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.00

Configuring a Soft PVC for Structured CES with CAS Enabled

Since the CES T1/E1 port adapter emulates CBR services over ATM networks, it must be able to support channel-associated signalling (CAS) information that is introduced into structured CES circuits by PBXs and TDMs. An optional CAS feature for the CES T1/E1 port adapter meets this requirement.

CAS information carried in a CBR bit stream can be configured with a CES module, as follows:
Note For a detailed description of CAS operation and the on-hook detection feature, refer to the circuit emulation services topic in the Guide to ATM Technology.

This section describes how to configure a soft PVC for structured CES with channel-associated signalling (CAS) enabled.

Note Typically you will configure a soft PVC between CES modules anywhere in your network. For simplicity, this example and the accompanying procedure describe how to create a soft PVC between modules in the same ATM switch router chassis.

The following procedure is based on the following assumptions:

Figure 18-6 shows a soft PVC configured for structured CES with CAS enabled.


Figure 18-6: Soft PVC Configured for Structured CES with CAS Enabled


To configure a soft PVC for structured CES with CAS enabled, follow these steps, beginning in privileged EXEC mode:
Step Command Purpose

1 . 

show ces status

Displays information about the current CBR interfaces.

Use this command to choose the ports to be configured with CAS enabled.

2 . 

configure terminal

At the privileged EXEC mode prompt, enters global configuration mode.

3 . 

interface cbr card/subcard/port

Selects the source interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

4 . 

ces dsx1 signalmode robbedbit

Configures the signal mode to robbedbit.

5 . 

ces circuit circuit-id cas

Enables channel-associated signalling.

6 . 

exit

Returns to global configuration mode.

7 . 

interface cbr card/subcard/port

Selects the destination interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

8 . 

ces dsx1 signalmode robbedbit

Configures the signal mode to robbedbit.

9 . 

ces circuit circuit-id cas

Enables channel-associated signalling.

Example

The following example shows how to enable channel-associated signalling on the soft PVC configured (see Figure 18-6):

CESwitch# show ces status
 
   Interface      IF      Admin        Port  Channels in
     Name       Status   Status        Type      use
------------- -------- --------- ----------- -----------
     CBR3/0/0       UP        UP          T1   1-3,7
     CBR3/0/1     DOWN        UP          T1
     CBR3/0/2     DOWN        UP          T1
     CBR3/0/3       UP        UP          T1   10-13
 
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/0
CESwitch(config-if)# ces dsx1 signalmode robbedbit 
CESwitch(config-if)# ces circuit 1 cas
CESwitch(config-if)# exit
CESwitch(config)# interface cbr 3/0/3
CESwitch(config-if)# ces dsx1 signalmode robbedbit 
CESwitch(config-if)# ces circuit 1 cas

Verifying a Soft PVC for Structured CES with CAS Enabled

To verify the soft PVC with structured CES and CAS enabled, use the following EXEC commands:
Command Purpose

show ces circuit

Shows the configuration information for the soft PVC.

show ces circuit interface cbr card/subcard/port circuit-id

Shows the detailed interface configuration information for the soft PVC.

Examples

The following example displays the details of the CES circuit (shown in Figure 18-6), using the show ces circuit command at the privileged EXEC mode prompt:

CESwitch# show ces circuit
 
Interface  Circuit  Circuit-Type     X-interface   X-vpi   X-vci Status
 CBR3/0/0    0       Active SoftVC   ATM-P3/0/3      0        16 UP
 CBR3/0/1    0       Passive SoftVC  ATM-P3/0/3      0      1040 UP

The following example displays the CAS status for the source port CBR 3/0/0 (shown in Figure 18-6):

CESwitch# show ces circuit interface cbr 3/0/0 1
Circuit: Name CBR-PVC-A, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/0, Circuit_id 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 1-3,7
Channels used by this circuit: 1-3,7
Cell-Rate: 698, Bit-Rate 256000



  
cas ON, cell_header 0x100 (vci = 16)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow unavailable, OverFlow unavailable
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       45, startDequeueDepth       28
Partial Fill:       47, Structured Data Transfer 98
Active SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.10 vpi 0, vci 16
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10

The following example displays the CAS status for the destination port CBR 3/0/3 (shown in Figure 18-6):

CESwitch# show ces circuit interface cbr 3/0/3 1
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/3, Circuit_id 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 698, Bit-Rate 256000



  
cas ON, cell_header 0xC100 (vci = 3088)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow unavailable, OverFlow unavailable
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0
state: VcActive, maxQueueDepth       45, startDequeueDepth       28
Partial Fill:       47, Structured Data Transfer 98
Passive SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10 vpi 0, vci 3088
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.00

Configuring a Soft PVC for Structured CES with CAS and On-Hook Detection Enabled

This section outlines the additional steps that you must take to activate the on-hook detection (bandwidth-release) feature in a 1 x 64 structured CES circuit.

To configure a soft PVC for structured CES with CAS and on-hook detection enabled, follow these steps, beginning in global configuration mode:

Step Command Purpose

1 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

2 . 

ces circuit circuit-id [cas]
[on-hook-detect pattern]

Configures channel-associated signalling and on-hook detection on the CES circuit.

Example

The following example shows how to configure on-hook detection on the soft PVC with structured CES and CAS enabled in the previous section "Configuring a Soft PVC for Structured CES with CAS Enabled" (shown in Figure 18-6):

CESwitch(config)# interface cbr 3/0/0
CESwitch(config-if)# ces circuit 1 cas on-hook-detect 2
Note The four ABCD bits in the CAS mechanism are device-specific, depending on the manufacturer of the voice/video telephony device that generates the CBR traffic. The ABCD bits of the CAS mechanism are user-configurable.

Verifying a Soft PVC for Structured CES with CAS and On-Hook Detection Enabled

To show the on-hook detection configuration of a soft PVC configured with structured CES and CAS enabled, use the following EXEC command:
Command Purpose

show ces circuit interface cbr card/subcard/port circuit-id

Shows the detailed interface configuration information for the soft PVC.

Example

The following example shows the soft PVC with CAS and on-hook detection enabled as hexadecimal number 2 (shown in Figure 18-6):

CESwitch# show ces circuit interface cbr 3/0/3 1
Circuit: Name CBR-PVC-B, Circuit-state ADMIN_UP / oper-state UP 
Interface CBR3/0/3, Circuit_id 1, Port-Type T1, Port-State UP
Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_SYNC
Channel in use on this port: 10-13
Channels used by this circuit: 10-13
Cell-Rate: 698, Bit-Rate 256000



  
cas ON, cell_header 0xC100 (vci = 3088)
Configured CDV 2000 usecs, Measured CDV unavailable
De-jitter: UnderFlow unavailable, OverFlow unavailable



  
ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x2
state: VcActive, maxQueueDepth       45, startDequeueDepth       28
Partial Fill:       47, Structured Data Transfer 98
Passive SoftVC
Src: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.803c.10 vpi 0, vci 3088
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.00

Creating Multiple Structured Soft PVCs on the Same CES Port

This section describes how to create more than one structured soft PVC on the same CES T1/E1 port. Figure 18-7 shows how you can configure multiple CES circuits on a single T1/E1 port.

Note Typically you will configure a soft PVC between CES modules anywhere in your network. For simplicity, this example and the accompanying procedure describe how to create a soft PVC between modules in the same ATM switch router chassis.

Assume that certain configuration information has already been established for a soft PVC (see Figure 18-6) and that you are to create an additional soft PVC involving the same CES module.

The following assumptions apply to creating multiple soft PVCs on the same T1/E1 port (see Figure 18-7):


Figure 18-7: Configuring Multiple Structured Soft PVCs on the Same CES T1/E1 Port


Configuring multiple soft PVCs for structured CES is a two-phase process:

Phase 1---Configuring the Destination (Passive) Side of Multiple Soft PVCs

To configure multiple soft PVCs on the destination (passive) side of the same port, follow these steps, beginning in global configuration mode:
Step Command Purpose

1 . 

interface cbr card/subcard/port

Selects the physical interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

2 . 

ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

3 . 

ces dsx1 clock source {loop-timed | network-derived}

Configures the clock source.

4 . 

  • For T1 framing: ces dsx1 framing {sf | esf}

  • For E1 framing: ces dsx1 framing {e1_crc_mfCAS_lt | e1_crc_mf_lt | e1_lt | e1_mfCAS_lt}

Configures the framing type.

  • For CES T1, the default is esf.

  • For CES E1, the default is e1_lt.

5 . 

ces dsx1 linecode {ami | b8zs | hdb3}

Configures the line code type.

  • For CES T1, the default is b8zs.

  • For E1, the default is hdb3.

6 . 

ces circuit circuit-id [circuit-name name] [timeslots number]

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

Note The 0 circuit identifier is reserved for unstructured service.

  • Configures the CES interface circuit name.

  • Configures the time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

Example

The following example shows how to configure multiple soft PVCs on the destination (passive) side of the same port (shown in Figure 18-7):

CESwitch(config)# interface cbr 3/0/2
CESwitch(config-if)# ces aal1 service structured
CESwitch(config-if)# ces dsx1 clock source network-derived 
CESwitch(config-if)# ces dsx1 framing esf
CESwitch(config-if)# ces dsx1 linecode b8zs
CESwitch(config-if)# ces circuit 2 timeslots 24 circuit-name CBR-PVC-CA
Note If you do not specify the circuit name and logical name parameters in the command line, the system automatically assigns a unique default name in the form CBRx/y/z:# for the circuit being configured. For example, the default name for this particular circuit is CBR3/0/2:1. For structured circuit emulation services, the circuit number sequence always begins at 1 for each port in a CES module.

Phase 2---Configuring the Source (Active) Side of Multiple Soft PVCs

To configure multiple soft PVCs on the source (active) side of the same port, follow these steps, beginning in global configuration mode:
Step Command Purpose

1 . 

interface cbr card/subcard/port

Selects the source interface to be configured.

Note If the interface is up, you might have to disable it (using the shutdown command) before you can configure the circuit. After you configure the circuit, run the no shutdown command to reenable the interface.

2 . 

ces circuit circuit-id [circuit-name name] [timeslots number]

Configures the following CES connection attributes for the circuit:

  • Circuit id number.

    • For CES T1 structured service,
      use 1 through 24.

    • For CES E1 structured service,
      use 1 through 31.

Note The 0 circuit identifier is reserved for unstructured service.

  • Configures the CES interface circuit name.

  • Configures the time slots for the circuit for structured service only.

    • For CES T1, the range is 1 through 24.

    • For CES E1, the range is 1 through 31.

3 . 

end

Exits interface configuration mode.

4 . 

show ces address

Shows the CES address for the destination end of the circuit.

Use this command to retrieve the VPI/VCI of the destination port.

5 . 

configure terminal

At the privileged EXEC prompt, enters configuration mode.

6 . 

interface cbr