ATM Switch Router Software Configuration Guide, 12.0(22)W5(25) - Configuring Circuit Emulation Services [Cisco Catalyst 8500 Series Multiservice Switch Routers]

Table Of Contents

Configuring Circuit Emulation Services

Overview of CES T1/E1 Interfaces

Clocking Options

Interfaces Supported

Connectors Supported

Functions Supported by CES Modules

Framing Formats and Line Coding Options for CES Modules

Default CES T1/E1 Interface Configuration

Configuring CES T1/E1 Interfaces

General Guidelines for Creating Soft PVCs for Circuit Emulation Services

Configuring T1/E1 Unstructured Circuit Emulation Services

Overview of Unstructured Circuit Emulation Services

Configuring a Hard PVC for Unstructured CES

Verifying a Hard PVC for Unstructured CES

Configuring a Soft PVC for Unstructured CES

Verifying a Soft PVC for Unstructured CES

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

Overview of Structured Circuit Emulation Services

Configuring a Hard PVC for Structured CES

Verifying a Hard PVC for Structured CES

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

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

Configuring a Soft PVC for Structured CES

Verifying a Soft PVC for Structured CES

Configuring a Soft PVC for Structured CES with CAS Enabled

Verifying a Soft PVC for Structured CES with CAS Enabled

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

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

Creating Multiple Structured Soft PVCs on the Same CES Port

Verifying the Creation of Multiple Structured Soft PVCs on the Same CES Port

Reconfiguring a Previously Established Circuit

Deleting a Previously Established Circuit

Verifying Deletion of a Previously Established Circuit

Configuring SGCP

Operation

Configuring SGCP on the Entire Switch

Displaying SGCP

Configuring CES Circuits for SGCP

Displaying SGCP Endpoints

Displaying SGCP Connections

Configuring SGCP Request Handling

Configuring Call-Agent Address

Shutting Down SGCP

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

• Configuring CES T1/E1 Interfaces

• General Guidelines for Creating Soft PVCs for Circuit Emulation Services

• Configuring T1/E1 Unstructured Circuit Emulation Services

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

• Reconfiguring a Previously Established Circuit

• Deleting a Previously Established Circuit

• Configuring SGCP

Overview of CES T1/E1 Interfaces

You can use CES T1/E1 port adapters for links that require CBR services, such as interconnecting 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:

•Self-timing based on a stratum 4 level clock

•Loop timing from the received data stream—ideal for public network connections

•Timing synchronized to a selected master clock port—required to distribute a single clock across a network

Interfaces Supported

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

•Catalyst 8540 MSR—up to 64 CES T1/E1 interfaces

•Catalyst 8510 MSR and LightStream 1010—up to 32 CES T1/E1 interfaces

Connectors Supported

The CES T1 port adapters support UTP connectors and the CES E1 port adapters support UTP, foil twisted-pair, 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:

•Circuit emulation services interworking function (CES-IWF), which enables communication between CBR and ATM UNI interfaces

•T1/E1 CES unstructured services

•T1/E1 CES structured services

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 and 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:

•Loopback = no loopback

•Signalling mode = no signalling

•Transmit clock source = network-derived

•Data format = clear channel

•Line build-out (LBO) = 0 to 110 feet

•Cell delay variation = 2000 microseconds

•Channel associated signalling (CAS) = FALSE

•Partial fill = 47

•AAL1 service type = unstructured

•AAL1 clock mode = synchronous

The following defaults are assigned to CES T1 port adapters:

–Framing = ESF

–Line coding = B8ZS

The following defaults are assigned to CES E1 port adapters:

–Framing = E1_LT

–Line coding = HDB3

–International bits = 0x3

–National bits = 0x1f

–Multiframe spare bits = 0xb

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 commands, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# interface cbr card/subcard/port

Switch(config-if)#

Selects the physical interface to be configured and enters global configuration mode.

Step 2

Switch(config-if)# ces aal1 service {structured | unstructured}

Configures the service type. The default is unstructured.

Step 3

Switch(config-if)# ces aal1 clock {adaptive | srts | synchronous}

Configures the type of clocking.

Note For structured CES, the default is synchronous.

Step 4

Switch(config-if)# 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 default is 2000 milliseconds.

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

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

•Disables the circuit. The default is no shutdown.

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

•Configures on-hook detection.

Step 5

Switch(config-if)# ces dsx1 clock source {loop-timed | network-derived}

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

Step 6

Switch(config-if)# ces dsx1 framing {sf | esf}

Switch(config-if)# ces dsx1 framing {e1_crc_mfCAS_lt | e1_crc_mf_lt | e1_lt | e1_mfCAS_lt}

Configures CES T1 framing mode. The default is esf.

Configures CES E1 framing mode. The default is e1_lt.

Step 7

Switch(config-if)# 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.

Step 8

Switch(config-if)# ces dsx1 linecode {ami | b8zs}

Switch(config-if)# ces dsx1 linecode {ami | hdb3}

Configures CES T1 line code type. The default is b8zs.

Configures CES E1 line code type. The default is hdb3.

Step 9

Switch(config-if)# ces dsx1 loopback {line | noloop | payload}

Configures the loopback test method. The default is noloop.

Step 10

Switch(config-if)# ces dsx1 signalmode robbedbit

Configures the CES T1 signal mode to robbedbit. The default is no.

Step 11

Switch(config-if)# 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.

–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.

Switch(config-if)# 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 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 default is 5,000.

Specifies in seconds, the maximum retry interval between any two attempts. 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 length to range from 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 "Troubleshooting the Interface Configuration" section to confirm your interface configuration.

General Guidelines for Creating Soft PVCs for Circuit Emulation Services

You can create either hard permanent virtual channels (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:

•A hard PVC on a CES T1/E1 port—Should a failure occur in a midpoint switch, hard PVCs are not automatically rerouted.

•A soft PVC on a CES T1/E1 port—Should a failure occur in a midpoint switch, soft PVCs are rerouted automatically, assuming another route is available.

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:

• Configuring T1/E1 Unstructured Circuit Emulation Services

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

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.

Note This is an arbitrary decision—you can choose either port as the destination end of the circuit. However, you must decide which port is to function in this capacity and proceed accordingly.

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.

Note If the interface is up, you might have to disable it, using the shutdown command, before you can configure the circuit. After configuring the circuit, use the no shutdown command to reenable the interface.
CESwitch# configure terminal
CESwitch(config)# interface cbr 3/0/1
CESwitch(config-if)# shutdown
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-B
CESwitch(config-if)# no shutdown
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.

Note If the interface is up, you might have to disable it, using the shutdown command, before you can configure the circuit. After configuring the circuit, use the no shutdown command to reenable the interface.
CESwitch(config)# interface cbr 3/0/0
CESwitch(config-if)# shutdown
CESwitch(config-if)# 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 104
CESwitch(config-if)# no shutdown
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 following subsections describe the procedures for configuring CES modules for unstructured circuit emulation services:

• Configuring a Hard PVC for Unstructured CES

• Verifying a Hard PVC for Unstructured CES

• Configuring a Soft PVC for Unstructured CES

• Verifying a Soft PVC for Unstructured CES

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 "Configuring Network Clocking" section on page 3-10. 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:

•For the Catalyst 8540 MSR, use the optional clocking module.

•For the Catalyst 8510 MSR and LightStream 1010 ATM switch routers, use feature card per flow queueing (FC-PFQ).

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 permanent virtual channel (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:

Command

Purpose

Step 1

Switch# show ces status

Displays information about the current CBR interfaces.

Use this command to choose the source CBR port.

Step 2

Switch# 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.

Step 3

Switch# configure terminal

Switch(config)#

At the privileged EXEC prompt, enters global configuration mode.

Step 4

Switch(config)# interface cbr card/subcard/port

Switch(config-if)#

Selects the physical interface to be configured.

Step 5

Switch(config-if)# shutdown

Disables the interface.

Step 6

Switch(config-if)# ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

Step 7

Switch(config-if)# ces aal1 clock {adaptive | srts | synchronous}

Configures the AAL1 clock mode.

Step 8

Switch(config-if)# 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.

Step 9

Switch(config-if)# 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.

Step 10

Switch(config-if)# no shutdown

Reenables the interface.

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)# shutdown
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces aal1 clock adaptive 
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
CESwitch(config-if)# no shutdown
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:

•The circuit named CBR-PVC-A is in an UP state.

•The interface CBR 3/0/0 has a circuit id of 0 (because the entire bandwidth of the port is dedicated to that circuit).

•The AAL1 clocking method is adaptive clocking.

•The source port for the hard PVC is CBR 3/0/0. The destination port is ATM 0/1/3.

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:

•Any ATM switch router external ATM port in the network

•A port in any other CES module in the network

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

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

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:

Command

Purpose

Step 1

Switch# show ces status

Displays information about current CBR interfaces.

Use this command to choose the destination port.

Step 2

Switch# configure terminal

Switch(config)#

At the privileged EXEC prompt, enters global configuration mode.

Step 3

Switch(config)# interface cbr card/subcard/port

Switch(config-if)#

Selects the physical interface to be configured.

Step 4

Switch(config-if)# shutdown

Disables the interface.

Step 5

Switch(config-if)# ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

Step 6

Switch(config-if)# ces aal1 clock {adaptive | srts | synchronous}

Configures the CES interface AAL1 clock mode.

Step 7

Switch(config-if)# ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

Step 8

Switch(config-if)# 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.

Step 9

Switch(config-if)# no shutdown

Reenables the interface.

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)# shutdown
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# ces circuit 0 circuit-name CBR-PVC-B
CESwitch(config-if)# no shutdown
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 steps, beginning in privileged EXEC mode:

Command

Purpose

Step 1

Switch# 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.

Step 2

Switch# configure terminal

Switch(config)#

At the privileged EXEC prompt, enters global configuration mode.

Step 3

Switch(config)# interface cbr card/subcard/port

Switch(config-if)#

Selects the physical interface to be configured.

Step 4

Switch(config-if)# shutdown

Disables the interface.

Step 5

Switch(config-if)# ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

Step 6

Switch(config-if)# ces aal1 clock {adaptive | srts | synchronous}

Configures the CES interface AAL1 clock mode.

Step 7

Switch(config-if)# ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

Step 8

Switch(config-if)# 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.

Step 9

Switch(config-if)# 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.

Step 10

Switch(config-if)# no shutdown

Reenables the interface.

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-if)# shutdown
CESwitch(config-if)# ces aal1 service unstructured
CESwitch(config-if)# ces aal1 clock synchronous
CESwitch(config-if)# ces dsx1 clock source network-derived
CESwitch(config-if)# 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
CESwitch(config-if)# no shutdown
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 "Configuring SGCP" section .

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 "Configuring Network Clocking" section on page 3-10. 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:

•For the Catalyst 8540 MSR, use the optional clocking module.

•For the Catalyst 8510 MSR and LightStream 1010 ATM switch routers, use feature card per flow queueing (FC-PFQ).

Configuring a Hard PVC for Structured CES

This section describes how to configure a hard permanent virtual channel (PVC) for structured circuit emulation services.

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

•Four time slots (DS0 channels 1 to 3, and 7) are configured for a circuit named CBR-PVC-A.

•ATM port 0/1/3 in the ATM switch router is designated as the destination port of the hard PVC.

•The CES AAL1 service is structured and the clock source is network-derived.

•The framing is esf and the line code is b8zs.

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:

Command

Purpose

Step 1

Switch# show ces status

Displays information about current CBR interfaces.

Use this command to choose the source port.

Step 2

Switch# show atm status

Displays information about current ATM interfaces.

Use this command to choose the destination port.

Step 3

Switch# configure terminal

Switch(config)#

At the privileged EXEC prompt, enters global configuration mode.

Step 4

Switch(config)# interface cbr card/subcard/port

Switch(config-if)#

Selects the physical interface to be configured.

Step 5

Switch(config-if)# shut

Step 6

Switch(config-if)# ces aal1 service {structured | unstructured}

Configures the CES interface AAL1 service type.

Step 7

Switch(config-if)# ces dsx1 clock source {loop-timed | network-derived}

Configures the CES interface clock source.

Step 8

Switch(config-if)# ces dsx1 framing {sf | esf}

Switch(config-if)# ces dsx1 framing {e1_crc_mfCAS_lt | e1_crc_mf_lt | e1_lt | e1_mfCAS_lt<