Table of Contents

Configuring Resource Management

Configuring Resource Management

This chapter describes Resource Management (RM).

Resource Management (RM) involves the modeling and management of switch, interface, and connection resources such as equivalent bandwidth and buffering to support the provision of specified traffic classes.

The LightStream 1010 asynchronous transfer mode (ATM) switch RM software provides the following functions:

• Network Management interface. Includes operational configuration change (changes that take place immediately), proposed configuration change (changes that must take place on restart), user interface, and status.
  
  
• Default quality of service (QOS) Objective Table management. As UNI 3 signaling does not provide information elements to signal QOS values, RM provides a table containing default values for QOS.
  
  
• Connection Traffic Table (CTT) management. Rather than store traffic parameters for each connection in that connection's data structure, RM manages a table of connection traffic parameters, used by network and connection management.
  
• Hardware resource management. Includes switch cell priority limits, interface queue sizes and thresholds, and output interface pacing.
  
  
• Resource Call Admission Control (RCAC). RCAC determines whether a Virtual Channel Connection/Virtual Path Connection (VCC/VPC) can be admitted (allowed to be set up), based on the available connection resources and requested traffic characteristics.
  
• Logical interface creation and deletion.
  
  
• Private Network-Network Interface (PNNI) metrics. RM supplies PNNI with link metrics for connection routing.
  
  

Resource management configuration is separated into the following configuration tasks:

• Configure Global Resource Management Tasks
  
  
• Configure Physical Interface Tasks
  
  
• Configure Interface Tasks
  
  

Configure Global Resource Management Tasks

Global resource management configurations affect all interfaces on the switch.

The following sections describe global resource management tasks:

• Configure the Default QOS Objective Table
  
  
• Configure the Switch Oversubscription Factor (OSF)
  
  
• Configure Service Category Limits
  
  
• Configure Available Bit Rate Congestion Notification Mode
  
  
• Sustained Cell Rate Margin Factor
  
  

Configure the Default QOS Objective Table

As UNI 3 signaling does not provide Information Elements (IEs) to signal QOS values, RM provides a table of default objective values for QOS for Guaranteed Service Categories. These values are used as criteria for connection setup requirements. These are either metric values (accumulated over multiple-hops of a call) or attributes (a gating criterion not accumulated, but checked at each interface). Maximum Cell Transfer Delay and Peak-to-Peak Cell Delay Variation are metrics, while Cell Loss Ratio is an attribute.

Table 9-1 provides default values of the QOS objective table.

Each of the objectives can have a defined or undefined value. If undefined, then that objective is not considered in connection setup.

This table should be configured with the same values for an entire network.

To configure the default QOS objective table, perform the following task in global configuration mode:

Example

The following example changes the CBR maximum cell loss ratio objective for cell loss priority (CLP) 1+0 to 10^-12 cells-per-second:

Switch(config)#atm qos default cbr max-cell-loss-ratio clp1plus0 12
Switch(config)#

Display the ATM QOS Objective Table

Use the show atm qos-defaults command to display the UNI 3 Default QOS objective table. In particular, the service category (cbr, vbr-rt or vbr-nrt), maximum Cell Transfer Delay (CTD), peak-to-peak Cell Delay Variation and maximum Cell Loss Ratio objectives are displayed.

To display the ATM QOS objective table configuration, perform the following task in user EXEC mode:

Example

The following example displays the ATM QOS objective table configuration:

Switch#show atm qos-defaults
Default QoS objective table:
    Max cell transfer delay (in microseconds): any cbr, any vbr-rt
    Peak-to-peak cell  delay variation (in microseconds): any cbr, any vbr-rt
    Max cell loss ratio for CLP0 cells: any cbr, any vbr-rt, any vbr-nrt
    Max cell loss ratio for CLP0+1 cells:  10**(-12) cbr, any vbr-rt,  10**(-12)
 vbr-nrt
Switch#

Configure the Switch Oversubscription Factor (OSF)

The switch oversubscription factor (OSF) is used in determining initial port maximum queue sizing for VBR-NRT and ABR/unspecified bit rate (UBR) queues.

The sizing of the VBR-NRT and ABR-UBR queues are determined by the following equations where the default size of the CBR and VBR queues vary by interface type listed in Table 9-2:

Default Size (VBR-NRT) = 0.25 * ((OSF * 2048) - DefaultSize(CBR) - DefaultSize (VBR-RT))
Default Size (ABR-UBR) = 0.75 * ((OSF * 2048) - DefaultSize(CBR) - DefaultSize (VBR-RT))
 

To configure the OSF, perform the following task in global configuration mode. Use the no form of this command to assign the default value:

Example

The following example sets the switch over subscription factor to 16:

Switch(config)#atm over-subscription-factor 16
Switch(config)#

Display the Resource Management Configuration

Use the show atm resource command to display the OSF configuration.

To display the OSF configuration, perform the following task in user EXEC mode:

Example

The following example displays the switch oversubscription factor configuration:

Switch> show atm resource
Resource configuration:
    Over-subscription-factor 16  Sustained-cell-rate-margin-factor 1%
    Abr-mode:   relative-rate
    Atm service-category-limit (in cells):
         65535 cbr 65535 vbr-rt 65535 vbr-nrt 65535 abr-ubr
Resource state:
    Cells per service-category:
         0 cbr 0 vbr-rt 0 vbr-nrt 0 abr-ubr
Switch>

Configure Service Category Limits

The service category limit configuration allows limiting the number of cells admitted into the switch, determined by type of output queues.

Caution Setting a service-category limit to 0 causes the connection requests for the associated service categories to be rejected.

To configure the service category limits, perform the following task in global configuration mode. Use the no form of this command to assign the default value:

Example

The following example changes the service-category limit for the CBR cells within the switch fabric to 3000 cells:

Switch(config)#atm service-category-limit cbr 3000
Switch(config)#

Display the Resource Management Configuration

Use the show atm resource command to display the service-category limits configuration.

To display the service-category limits configuration, perform the following task in user EXEC mode:

Example

The following example displays the service-category limits configuration:

Switch> show atm resource
Resource configuration:
    Over-subscription-factor 16  Sustained-cell-rate-margin-factor 1%
    Abr-mode:   relative-rate
    Atm service-category-limit (in cells):
         3000 cbr 65535 vbr-rt 65535 vbr-nrt 65535 abr-ubr
Resource state:
    Cells per service-category:
         0 cbr 0 vbr-rt 0 vbr-nrt 0 abr-ubr
 
Switch>

Configure Available Bit Rate Congestion Notification Mode

Available bit rate (ABR) congestion notification mode changes the type of notification used on ABR connections to alert the end station of congestion. ABR mode configuration determines whether ABR uses Explicit Forward Congestion Indication (EFCI) marking or relative-rate marking (or both) for rate management on ABR connections.

The global configuration function is used to modify the ABR-mode selection for all ABR connections.

To configure the ABR mode, perform the following task in global configuration mode. Use the no form of this command to assign the default value:

Example

The following example configures the entire switch to set the EFCI bit whenever a cell arrives on a congested ABR connection:

Switch(config)#atm abr-mode efci
Switch(config)#

Display the Resource Management Configuration

Use the show atm resource command to display the ABR congestion notification mode configuration.

To display the ABR congestion notification mode configuration, perform the following task in user EXEC mode:

Example

The following example displays the ABR mode configuration:

Switch> show atm resource
Resource configuration:
    Over-subscription-factor 16  Sustained-cell-rate-margin-factor 1%
    Abr-mode: efci
    Atm service-category-limit (in cells):
         3000 cbr 65535 vbr-rt 65535 vbr-nrt 65535 abr-ubr
Resource state:
    Cells per service-category:
         0 cbr 0 vbr-rt 0 vbr-nrt 0 abr-ubr
 
Switch>

Configure Connection Traffic Table

A row in the Connection Traffic Table (CTT) must be created for each unique combination of traffic parameters. Virtual path links (VPLs) and virtual channel links (VCLs) then specify traffic by specifying a row in the table per flow (receive and transmit). Many VCL/VPLs can refer to the same row in the traffic table.

PVC Connection Traffic Rows

The function of the CTT in PVC setup requires storing PVC traffic values in a CTT data structure. Rows used for permanent virtual channels (PVCs) are called stable rows, and contain traffic parameters.

SVC Connection Traffic Rows

The function of the CTT in SVC setup provides a row identifier that Simple Network Management Protocol (SNMP) or the user interface can use to read or display SVC traffic parameters. A CTT row-index is stored in the connection-leg data structure for each flow of the connection.

To make CTT management software more efficient, the CTT row-index space is split into those allocated as a result of signaling and those allocated from the command line interface and SNMP. Table 9-3 describes the row-index range for both.

Table 9-4 describes the six well-known predefined rows.

There are five variations of the atm connection-traffic-table-row command---one for each service category (CBR, VBR-RT, VBR-NRT, ABR and UBR). To create or delete a CTT row, perform the following task in global configuration mode. Use the no form of this commands to assign the default value:

If you do not specify an index row number the system software will determine if one is free and display it in the allocated index field if the command is successful.

Example

The following example configures an ATM CTT row with an ABR peak-cell-rate of 30000 kilobits per second:

Switch#(config)#atm connection-traffic-table-row abr peak-cell-rate 30000
 Allocated index = 64000
Switch#(config)#
 

Display the ATM Connection Traffic Table

Use the show atm connection-traffic-table command to display the CTT configuration.

To display the CTT configuration, perform the following task in user EXEC mode:

Example

The following example displays the CTT configuration table:

Switch> show atm connection-traffic-table
Row      Service-category  peak-cell-rate  sustained-cell-rate  tolerance
1              ubr            7113539                                none
2              cbr                424                                none
3              vbr-rt             424               424                50
4              vbr-nrt            424               424                50
5              abr                424                                none
6              ubr                424                                none
2147483645*    ubr                  0                                none
2147483646*    ubr                  1                                none
2147483647*    ubr            7113539                                none
Switch>

Sustained Cell Rate Margin Factor

SCRMF determines the aggressiveness of weighting sustainable cell rate (SCR) compared to peak cell rate (PCR). It uses the connection admission control algorithm in admitting VBR connections.

To configure the sustained cell rate for the LightStream 1010, perform the following task in global configuration mode. Use the no form of this command to assign the default value:

Example

The following example configures the sustained cell-rate margin factor as 85 percent of maximum:

Switch#(config)#atm sustained-cell-rate-margin-factor 85
Switch#(config)#
 

Display the Resource Management Configuration

Use the show atm resource command to display the sustainable cell-rate margin factor mode configuration.

To display the sustainable cell-rate margin factor configuration, perform the following task in user EXEC mode:

Example

The following example displays the sustainable cell-rate margin factor configuration:

Switch> show atm resource
Resource configuration:
    Over-subscription-factor 16  Sustained-cell-rate-margin-factor 85%
    Abr-mode:   relative-rate
    Atm service-category-limit (in cells):
         65535 cbr 65535 vbr-rt 65535 vbr-nrt 65535 abr-ubr
Resource state:
    Cells per service-category:
         0 cbr 0 vbr-rt 0 vbr-nrt 0 abr-ubr
 
Switch>
 

Configure Physical Interface Tasks

Physical interface resource management configurations affect only specific interfaces on the switch.

The following sections describe physical interface configuration resource management tasks:

• Configure Interface Maximum Queue Size
  
  
• Configure Interface Queue Thresholds per Service Category
  
  
• Configure Interface Output Pacing
  
  
• Configure Controlled Link Sharing
  
  

Configure Interface Maximum Queue Size

Maximum Queue Size is used to determine the following:

• Maximum number of cells in the switch fabric queue
  
  
• CTD
  
  
• Peak-to-peak Cell Delay Variation (CDV) provided on an output switch interface
  
  

To configure the maximum queue size, perform the following task in interface configuration mode. Use the no form of this command to assign the default value:

This command is not applicable on subinterface level configuration. For other restrictions see the LightStream 1010 ATM Switch Command Reference.

If the interface status is up, then the force parameter is required before the request is completed. If the request is forced, output on the interface is briefly disabled, cells on the output queue are discarded, and the queue size is changed to the new limit. Any impact on existing connections of the implicit change in guaranteed maximum CTD and Peak-to-peak CDV is not considered before making the change. Subsequent setup of SVC connections will be affected.

The size-number argument is the queue-size in cells 32 to 65,504. The number is rounded up to the closest multiple of 32.

Example

The following example configures the CBR ATM output queue maximum size to 30,000 cells:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm output-queue force cbr max-size 30000
Switch(config-if)#
 

Display the Output Queue Maximum Configuration

Use the show atm interface resource atm command to display the output queue maximum size configuration.

To display the output queue maximum size configuration, perform the following task in user EXEC mode:

Example

The following example displays the interface output queue maximum size configuration:

Switch>show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 25% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 50% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: disabled   0 Kbps rate configured, 0 Kbps rate installed
    Link Distance: 0 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: none RX,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: disabled  0 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: none vbr RX, none vbr TX,
        Tolerance RX: none cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        147743 cbr RX, 147743 cbr TX, 147743 vbr RX, 147743 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 0 pvcs,  0 svcs
Switch>

Configure Interface Queue Thresholds per Service Category

The queue thresholds can be specified for the different levels of service and configured on each interface queue. The following queue thresholds can be configured:

• Output queue explicit forward congestion control indicator (EFCI) threshold
  
  
• Output queue cell loss priority (CLP) and packet discard (PD) threshold
  
  
• ABR relative rate threshold
  
  

These queue thresholds can be changed at any time. The result is to change the threshold for all connections of that service category using the interface for output, and for any subsequent connections.

To configure the output threshold, perform the following task in interface configuration mode. Use the no form of these commands to assign the default value:

These commands are not applicable on subinterface level configuration. For other restrictions see the LightStream 1010 ATM Switch Command Reference.

The disc-thresh-number and abr-thresh-number arguments are 12, 25, 37, 50, 62, 75, 87, or 100 indicating the percentage of queue-full. The efci-thresh-number argument is 12, 25, 50, or 100, indicating the percentage of queue-full.

The associated threshold function can be disabled by setting the threshold to 100 percent.

Default:

For all service categories, discard-threshold is 50 percent, efci-threshold is 25 percent, and abr-relative-rate is 25 percent.

Examples

The following example configures the interface output threshold CBR discard threshold to 87 percent of maximum size:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm output-threshold cbr discard 87
Switch(config-if)#
 

The following example configures the interface output discard threshold for CBR explicit forward congestion-control indicator threshold to 50 percent of maximum size:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm output-threshold cbr efci 50
Switch(config-if)#

Display the Output Threshold Maximum Configuration

Use the show atm interface resource atm command to display the output threshold maximum size configuration.

To display the output threshold maximum size configuration, perform the following task in user EXEC mode:

Example

The following example displays the interface output threshold maximum size configuration:

Switch>show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 50% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 87% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: disabled   0 Kbps rate configured, 0 Kbps rate installed
    Link Distance: 0 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: none RX,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: disabled  0 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: none vbr RX, none vbr TX,
        Tolerance RX: none cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        147743 cbr RX, 147743 cbr TX, 147743 vbr RX, 147743 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 0 pvcs,  0 svcs
Switch>
 

Configure Interface Output Pacing

Output pacing is used to artificially reduce the output speed of an interface in kilobits per second (kbps).

Output pacing can be changed at any time or enabled or disabled. When an output pacing change request is made, resource management will determine whether the change would result in not providing the guaranteed bandwidth at the outbound port for existing virtual channels/virtual paths (VC/VPs). Guaranteed bandwidth is reserved for CBR and VBR connections.

To enable or change an interface output pacing rate, perform the following task in interface configuration mode. Use the no form of these commands to assign the default value:

The force argument indicates that the change should be made even if it results in an output cell rate that does not provide sufficient bandwidth for guaranteed service on the transmit flow of the interface.

The granularity of pacing rate is determined by the physical interface and varies with the size of the bit rate requested. The value entered is rounded-up to the closest value available.

This command does not apply to the CPU interface (2/0/0) or subinterfaces. For other restrictions see the LightStream 1010 ATM Switch Command Reference.

Example

The following example configures the interface output pacing to 10,000 kbps:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm pacing 10000
Switch(config-if)#
 

Display the Output Pacing Configuration

Use the show atm interface resource command to display the output pacing configuration.

Perform the following task in user EXEC mode:

Example

The following example displays the interface output pacing configuration:

Switch> show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 50% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 87% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: enabled   10000 Kbps rate configured, 10000 Kbps rate installed
    Link Distance: 0 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: none RX,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: disabled  0 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: none vbr RX, none vbr TX,
        Tolerance RX: none cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        147743 cbr RX, 9499 cbr TX, 147743 vbr RX, 9499 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 0 pvcs,  0 svcs
Switch>

Configure Controlled Link Sharing

Resource management allows fine tuning the connection admission control functions on a per interface and direction (receive and transmit) basis. The reservations are specified with the following three parameters:

• Maximum aggregate guaranteed cell rate on an interface. This limits the guaranteed bandwidth which can be allocated on an interface.
  
  
• Maximum guaranteed cell rates on an interface per service category.
  
  
• Minimum guaranteed cell rates on an interface per service category.
  
  

These minimum and maximum parameters are related using the values in Table 9-5.

To configure controlled link sharing, perform the following task in interface configuration mode. Use the no form of these commands to assign the default value:

For restrictions to this command see the LightStream 1010 ATM Switch Command Reference.

Example

The following example configures the controlled link sharing, maximum guaranteed service bandwidth, and receive configuration to 87 percent:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm cac link-sharing max-guaranteed-service-bandwidth receive 87
Switch(config-if)#

Display the Controlled Link Sharing Configuration

Use the show atm interface resource command to display the controlled link sharing configuration.

To display the controlled link sharing configuration, perform the following task in user EXEC mode:

Example

The following example displays the controlled link sharing configuration:

Switch> show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 50% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 87% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: enabled   10000 Kbps rate configured, 10000 Kbps rate installed
    Link Distance: 0 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: 87% Rx,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: disabled  0 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: none vbr RX, none vbr TX,
        Tolerance RX: none cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        135302 cbr RX, 9499 cbr TX, 135302 vbr RX, 9499 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 0 pvcs,  0 svcs
Switch>

Configure Interface Tasks

The following sections describe interface configuration resource management tasks:

• Configure Outbound Link Distance
  
  
• Configure the Limitations of Best-Effort Connections
  
  
• Configure Interface Maximum of Individual Traffic Parameters
  
  
• Configuring ATM Default Tolerance
  
  

Configure Outbound Link Distance

Specifying the physical link distance for the for the next ATM hop in the outbound direction allows the user to increase the propagation-delay component of delay. Propagation delay is used in determining the Connection admission Control (CAC) maximum cell transfer delay provided on the output by a switch interface, which can affect the SVC connection requests accepted.

To configure the ATM link distance, perform the following task in subinterface configuration mode. Use the no form of this command to assign the default value:

Example

The following example configures the interface link distance configuration to 150 kilometers:

Switch(config-if)#atm link-distance 150
Switch(config-if)#

Display the Interface Link Distance Configuration

Use the show atm interface resource command to display the interface link distance configuration.

To display the interface link distance configuration, perform the following task in user EXEC mode:

Example

The following example displays the interface link distance configuration:

Switch> show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 50% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 87% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: enabled   10000 Kbps rate configured, 10000 Kbps rate installed
    Link Distance: 150 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: 87% Rx,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: disabled  0 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: none vbr RX, none vbr TX,
        Tolerance RX: none cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        135302 cbr RX, 9499 cbr TX, 135302 vbr RX, 9499 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 0 pvcs,  0 svcs
Switch>

Configure the Limitations of Best-Effort Connections

Each interface may be configured to allow a specific number of best-effort (ABR and UBR) connections.

To configure the number of best-effort connections, perform the following task in subinterface configuration mode. Use the no form of this command to revert to the default value.

Example

The following example configures the connection best-effort limit configuration to 2000:

Switch(config)#interface atm 3/0/0
Switch(config-if)# atm cac best-effort-limit 2000
Switch(config-if)#

Display the Interface Best-Effort Limit Configuration

Use the show atm interface resource command to display the subinterface best-effort configuration.

To display the interface best effort configuration, perform the following task in user EXEC mode:

Example

The following example displays the subinterface best-effort configuration:

Switch> show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 50% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 87% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: enabled   10000 Kbps rate configured, 10000 Kbps rate installed
    Link Distance: 150 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: 87% Rx,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: enabled  2000 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: none vbr RX, none vbr TX,
        Tolerance RX: none cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        135302 cbr RX, 9499 cbr TX, 135302 vbr RX, 9499 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 1 pvcs,  0 svcs
Switch>

Configure Interface Maximum of Individual Traffic Parameters

At the time a virtual circuit connection is set up, per-flow (receive and transmit traffic) parameters can be specified. Traffic parameter limits may be configured independently by service category and traffic direction for the following:

• Maximum peak cell rate
  
  
• Maximum sustained cell rate
  
  
• Maximum tolerance
  
  

To configure the traffic parameters, perform the following task in interface configuration mode. Use the no form of this command to assign the default value:

Examples

The following example configures interface 3/0/0 connection's maximum peak cell rate specified in receive mode on the interface for CBR connections to 100,000 kbps:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm cac max-peak-cell-rate cbr receive 100000
Switch(config-if)#
 

The following example configures interface 3/0/0 connection's maximum sustained cell rate, receive, to 60,000 kbps:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm cac max-sustained-cell-rate receive 60000
Switch(config-if)#
 

The following example configures interface 3/0/0 connection's maximum tolerance, receive, constant bit rate to 75,000 kbps:

Switch(config)#interface atm 3/0/0
Switch(config-if)#atm cac  max-tolerance cbr receive 75000
Switch(config-if)

Display the Interface Individual Traffic Configuration

Use the show atm interface resource command to display the interface individual traffic configuration.

To display the interface individual traffic configuration, perform the following task in user EXEC mode:

Example

The following example displays the interface output pacing configuration:

Switch> show atm interface resource atm 3/0/0
Resource Management configuration:
    Output queues:
        Max sizes(explicit cfg): 30000  cbr, none vbr-rt, none vbr-nrt, none abr-ubr
        Max sizes(installed): 30208 cbr, 256 vbr-rt, 4096 vbr-nrt, 12032 abr-ubr
        Efci threshold: 50% cbr, 25% vbr-rt, 25% vbr-nrt, 25% abr, 25% ubr
        Discard threshold: 87% cbr, 50% vbr-rt, 50% vbr-nrt, 50% abr, 50% ubr
        Abr-relative-rate threshold: 25% abr
    Pacing: enabled   10000 Kbps rate configured, 10000 Kbps rate installed
    Link Distance: 150 kilometers
    Controlled Link sharing:
        Max aggregate guaranteed services: 87% Rx,  none TX
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX
    Best effort connection limit: enabled  2000 max connections
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
        Peak-cell-rate RX: 100000 cbr, none vbr, none abr, none ubr
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
        Sustained-cell-rate: 60000 vbr RX, none vbr TX,
        Tolerance RX: 75000 cbr, none vbr, none abr, none ubr
        Tolerance TX: none cbr, none vbr, none abr, none ubr
Resource Management state:
    Cell-counts: 0 cbr, 0 vbr-rt, 0 vbr-nrt, 0 abr-ubr
    Available bit rates (in Kbps):
        135302 cbr RX, 9499 cbr TX, 135302 vbr RX, 9499 vbr TX,
    Allocated bit rates:
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
    Best effort connections: 1 pvcs,  0 svcs
Switch>

Configuring ATM Default Tolerance

To change the default tolerance to request for UPC of cells received on the interface for connections that do not individually request a tolerance value, use the atm default-tolerance command. Tolerance can be specified for PVCs via a Connection Traffic Table row. If no tolerance is specified in the row, then a per-interface, per-service category default tolerance is applied for purposes of UPC on the connection.

For signalled connections (SVC or Soft PVC), VBR tolerance (maximum burst size) can be signalled, but CBR/UBR tolerance cannot be signalled. The defaults specified on the interface are then used.

To configure the ATM default tolerance, perform the following task in interface configuration mode. Use the no form of this command to assign the default value:

Example

In the following example, the default tolerance to use for UPC of received cells on VBR-RT connections on an interface is changed.

Switch#config t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#interface atm 1/0/0
Switch(config-if)#
Switch(config-if)# atm default-tolerance vbr-rt 4000
Switch(config-if)#

Display the ATM Connection Traffic Table

Use the show atm connection-traffic-table command to display the CTT configuration.

To display the CTT, perform the following task in user EXEC mode:

Example

The following example displays the CTT configuration table:

Switch> show atm connection-traffic-table
Row      Service-category  peak-cell-rate  sustained-cell-rate  tolerance
1              ubr            7113539                                none
2              cbr                424                                none
3              vbr-rt             424               424                50
4              vbr-nrt            424               424                50
5              abr                424                                none
6              ubr                424                                none
2147483645*    ubr                  0                                none
2147483646*    ubr                  1                                none
2147483647*    ubr            7113539                                none
Switch>