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ATM Policing by Service Category for SVC/SoftPVC

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Table Of Contents

ATM Policing by Service Category for SVC/SoftPVC

Finding Feature Information

Contents

Information About ATM Policing by Service Category for SVC/SoftPVC

How to Configure ATM Policing by Service Category for SVC/SoftPVC

Configuring ATM Policing by Service Category for SVC/SoftPVC

Verifying ATM Policing by Service Category for SVC/SoftPVC

Troubleshooting Tips

Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC

Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC: Example

Configuration Examples for ATM Policing by Service Category for SVC/SoftPVC

Non-UBR Traffic Policing: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

Feature Information for ATM Policing by Service Category for SVC/SoftPVC

Glossary


ATM Policing by Service Category for SVC/SoftPVC

First Published: September 26, 2001
Last Updated: January 20, 2009

The ATM Policing by Service Category for SVC/SoftPVC feature enables you to specify which traffic to police, based on service category, on switched virtual circuits (SVCs) or terminating virtual circuits (VCs) on the destination end of a soft VC.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for ATM Policing by Service Category for SVC/SoftPVC" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Information About ATM Policing by Service Category for SVC/SoftPVC

•How to Configure ATM Policing by Service Category for SVC/SoftPVC

•Configuration Examples for ATM Policing by Service Category for SVC/SoftPVC

•Additional References, page 9

•Additional References, page 9

•Command Reference, page 10

•Feature Information for ATM Policing by Service Category for SVC/SoftPVC

•Glossary

Information About ATM Policing by Service Category for SVC/SoftPVC

When configured, an ATM switch at the network side of a user-to-network (UNI) interface polices the flow of cells in the forward (into the network) direction of a virtual connection. These traffic policing mechanisms are known as usage parameter control (UPC). With UPC, the switch determines whether received cells comply with the negotiated traffic management values and takes one of the following actions on violating cells:

•Pass the cell without changing the cell loss priority (CLP) bit in the cell header.

•Tag the cell with a CLP bit value of 1.

•Drop (discard) the cell.

This feature enables you to select which traffic is affected by UPC and how it is affected. For example, you can configure your switch to pass all UBR traffic, but tag all other traffic types.

For more information about UPC, see the "Traffic and Resource Management" chapter in the Guide to ATM Technology.

How to Configure ATM Policing by Service Category for SVC/SoftPVC

The tasks in the following sections describe configuration for the ATM Policing by Service Category for SVC/SoftPVC feature. Each task in the list is identified as either required or optional:

•Configuring ATM Policing by Service Category for SVC/SoftPVC (Required)

•Verifying ATM Policing by Service Category for SVC/SoftPVC (Optional)

Configuring ATM Policing by Service Category for SVC/SoftPVC

The task in this section configures the ATM Policing by Service Category for SVC/SoftPVC feature, using the following commands beginning in global configuration mode.

SUMMARY STEPS

1. enable

2. configure terminal

3. Router(config)# interface atm slot/subslot/port

4. Router(config-if)# atm svc-upc-intent [{abr | cbr | vbr-rt | vbr-nrt | ubr}]{tag | pass | drop}

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface atm slot/subslot/port

Example:

Router(config)# interface atm slot/subslot/port

Selects the ATM interface.

Step 4 

atm svc-upc-intent [{abr | cbr | vbr-rt | vbr-nrt | ubr}] {tag | pass | drop}

Example:

Router(config-if)# atm svc-upc-intent
[{abr | cbr | vbr-rt | vbr-nrt | ubr}]
{tag | pass | drop}


(Repeat this step for each service category and UPC mode combination.)

Specifies the UPC mode. If no service category is specified, then the UPC mode configuration is applied to all traffic types.

Verifying ATM Policing by Service Category for SVC/SoftPVC

Step 1 Enter the show atm vc or show atm vp EXEC command to display the UPC mode for a particular virtual circuit or VP. 

Switch# show atm vc int atm 0/0/1 2 120


Interface:ATM0/0/1, Type:oc3suni 

VPI = 2  VCI = 120

Status:DOWN

Time-since-last-status-change:1w1d

Connection-type:PVC 

Cast-type:point-to-multipoint-leaf

Packet-discard-option:disabled

Usage-Parameter-Control (UPC):pass 

Wrr weight:2

Number of OAM-configured connections:0

OAM-configuration:disabled

OAM-states: Not-applicable

Cross-connect-interface:ATM0/0/1, Type:oc3suni 

...

Step 2 Enter the show atm interface EXEC command. If the UPC mode is not the same for all service categories, the "Svc Upc Intent" field displays "by sc." 

Switch# show atm interface atm 8/0/1


Interface:     ATM8/0/1        Port-type:     oc3suni

IF Status:     UP              Admin Status:  up

Auto-config:   enabled         AutoCfgState:  completed

IF-Side:       Network         IF-type:       NNI

Uni-type:      not applicable  Uni-version:   not applicable

Max-VPI-bits:  8               Max-VCI-bits:  14

Max-VP:        255             Max-VC:        16383

ConfMaxSvpcVpi:255             CurrMaxSvpcVpi:255

ConfMaxSvccVpi:255             CurrMaxSvccVpi:255

ConfMinSvccVci:35              CurrMinSvccVci:35

Svc Upc Intent:by sc           Signalling:    Enabled

ATM Address for Soft VC:47.0091.8100.0000.0002.b9ae.9301.4000.0c84.0010.00

Configured virtual links:

  PVCLs SoftVCLs   SVCLs   TVCLs   PVPLs SoftVPLs   SVPLs Total-Cfgd Inst-Conns

      3        4       0       0       1        0       0          8          7

Logical ports(VP-tunnels):    0

Input cells:   3036674         Output cells:  3036816

5 minute input rate:            0 bits/sec,       0 cells/sec

5 minute output rate:           0 bits/sec,       0 cells/sec

Input AAL5 pkts:1982638, Output AAL5 pkts:1982687, AAL5 crc errors:0

Troubleshooting Tips

If a VC is not configured with the appropriate UPC mode, make sure that the VC was set up after the atm svc-upc-intent command was configured. Changes to the UPC mode take effect after the VC is torn down and set up again.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface atm slot/subslot/port

4. atm svc-upc-intent [{abr | cbr | vbr-rt | vbr-nrt | ubr}] {tag | pass | drop}

5. Repeat Step 4 for each service category and UPC mode combination.

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

Router(config)# interface atm slot/subslot/port

Selects the ATM interface.

Step 4 

Router(config-if)# atm svc-upc-intent
[{abr | cbr | vbr-rt | vbr-nrt | ubr}]
{tag | pass | drop}

Specifies the UPC mode.

•If no service category is specified, then the UPC mode configuration is applied to all traffic types.

Step 5 

Repeat step 4 for each service category and UPC mode combination.

—

Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC

The task in this section enable you to monitor and maintain the ATM Policing by Service Category for SVC/SoftPVC feature.

SUMMARY STEPS

1. enable

2. configure terminal

3. show atm interface

4. show controllers atm slot/subslot/port

5. show atm vc [interface atm slot/subslot/port]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

Router# show atm interface

Displays ATM-specific information about an ATM interface.

Step 4 

Router# show controllers atm slot/subslot/port

Displays information about a physical port device. Includes dropped (or discarded) cells.

Step 5 

Router# show atm vc [interface atm slot/subslot/port]

Displays the configured UPC action and intelligent packet discard mechanisms, as well as the number of cells discarded because of UPC violations.

Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC: Example 

Switch# show atm vc interface atm 3/0/1.51 51 16 


     Interface: ATM3/0/1.51, Type: oc3suni 

     VPI = 51  VCI = 16 

     Status: DOWN 

     Time-since-last-status-change: 2w0d 

     Connection-type: PVC 

     Cast-type: point-to-point 

     Packet-discard-option: enabled 

     Usage-Parameter-Control (UPC): pass 

     Wrr weight: 32 

     Number of OAM-configured connections: 0 

     OAM-configuration: disabled 

     OAM-states:  Not-applicable 

     Cross-connect-interface: ATM2/0/0, Type: ATM Swi/Proc 

     Cross-connect-VPI = 0 

     Cross-connect-VCI = 73 

     Cross-connect-UPC: pass 

     Cross-connect OAM-configuration: disabled 

     Cross-connect OAM-state:  Not-applicable 

     Encapsulation: AAL5ILMI 

     Threshold Group: 6, Cells queued: 0 

     Rx cells: 0, Tx cells: 0 

     Tx Clp0:0,  Tx Clp1: 0 

     Rx Clp0:0,  Rx Clp1: 0 

     Rx Upc Violations:0, Rx cell drops:0 

     Rx pkts:0, Rx pkt drops:0 

     Rx connection-traffic-table-index: 6 

     Rx service-category: UBR (Unspecified Bit Rate) 

     Rx pcr-clp01: 424 

     Rx scr-clp01: none 

     Rx mcr-clp01: none 

     Rx      cdvt: 1024 (from default for interface) 

     Rx       mbs: none 

     Tx connection-traffic-table-index: 6 

     Tx service-category: UBR (Unspecified Bit Rate) 

     Tx pcr-clp01: 424 

     Tx scr-clp01: none 

     Tx mcr-clp01: none 

     Tx      cdvt: none 

     Tx       mbs: none 

     No AAL5 connection registered

Configuration Examples for ATM Policing by Service Category for SVC/SoftPVC

This section provides the following configuration Non-UBR Traffic Policing: Example.

Non-UBR Traffic Policing: Example

In the following example, the UBR traffic on ATM 3/0/0 is passed while all other traffic is policed: 

Router(config)# interface atm 3/0/0

Router(config-if)# atm svc-upc-intent ubr pass

Router(config-if)# atm svc-upc-intent cbr tag

Router(config-if)# atm svc-upc-intent vbr-rt tag

Router(config-if)# atm svc-upc-intent vbr-nrt tag

Router(config-if)# atm svc-upc-intent abr drop

Additional References

The following sections provide references related to the ATM Policing by Service Category for SVC/SoftPVC feature.

Related Documents

Related Topic
Document Title

ATM commands

Cisco IOS Asynchronous Transfer Mode Command Reference


Standards

Standard
Title

None

—


MIBs

MIB
MIBs Link

•None.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFC
Title

None.

—


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport


Command Reference

The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Asynchronous Transfer Mode Command Reference at http://www.cisco.com/en/US/docs/ios/atm/command/reference/atm_book.html. For information about all Cisco IOS commands, go to the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or to the Cisco IOS Master Commands List.

•atm svc-upc-intent

Feature Information for ATM Policing by Service Category for SVC/SoftPVC

Table 1 lists the features in this module and provides links to specific configuration information. Only features that were introduced or modified in Cisco IOS Releases 12.2(1), 12.0(3)S, 12.2(33)SRA, 12.2(33)SXH, or later releases appear in the table.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 Feature Information for ATM Policing by Service Category for SVC/SoftPVC 

Feature Name
Releases
Feature Information

ATM Policing by Service Category for SVC/SoftPVC

12.2(4)B
12.2(13)T

The ATM Policing by Service Category for SVC/SoftPVC feature enables you to specify which traffic to police, based on service category, on switched virtual circuits (SVCs) or terminating VCs on the destination end of a soft VC.

In 12.2(4)B, this feature was introduced on the Cisco 6400 NSP.

This feature was integrated into Cisco IOS release 12.2 (13) T.


Glossary

ABR—available bit rate. QoS class defined by the ATM Forum for ATM networks. ABR is used for connections that do not require timing relationships between source and destination. ABR provides no guarantees in terms of cell loss or delay, providing only best-effort service. Traffic sources adjust their transmission rate in response to information they receive describing the status of the network and its capability to successfully deliver data. Compare with CBR, UBR, and VBR.

CBR—constant bit rate. QoS class defined by the ATM Forum for ATM networks. CBR is used for connections that depend on precise clocking to ensure undistorted delivery. Compare with ABR, UBR, and VBR.

CLP—cell loss priority. Field in the ATM cell header that determines the probability of a cell being dropped if the network becomes congested. Cells with CLP = 0 are insured traffic, which is unlikely to be dropped. Cells with CLP = 1 are best-effort traffic, which might be dropped in congested conditions to free up resources to handle insured traffic.

PVC—permanent virtual circuit (or connection). Virtual circuit that is permanently established. PVCs save bandwidth associated with circuit establishment and tear down in situations where certain virtual circuits must exist all the time. In ATM terminology, called a permanent virtual connection. Compare with SVC. See also virtual circuit.

soft PVC—A PVC-SVC hybrid in which only the two terminating virtual connection links (VCLs) at either end are permanent and the rest of the VCLs are switched (SVC). Like the PVC, a soft PVC is permanent and the called party cannot drop the connection. Like the SVC, a soft PVC is automatically rerouted if a switch or link in the path fails.

SVC—switched virtual circuit. Virtual circuit that is dynamically established on demand and is torn down when transmission is complete. SVCs are used in situations where data transmission is sporadic. See also virtual circuit. Called a switched virtual connection in ATM terminology. Compare with PVC.

tagged traffic—ATM cells that have their CLP bit set to 1. If the network is congested, tagged traffic can be dropped to ensure the delivery of higher-priority traffic. Sometimes called DE traffic. See also CLP.

traffic policing—Process used to measure the actual traffic flow across a given connection and compare it to the total admissible traffic flow for that connection. Traffic outside of the agreed upon flow can be tagged (where the CLP bit is set to 1) and can be discarded en route if congestion develops. Traffic policing is used in ATM, Frame Relay, and other types of networks. Also known as admission control, permit processing, rate enforcement, and UPC. See also tagged traffic.

UBR—unspecified bit rate. QoS class defined by the ATM Forum for ATM networks. UBR allows any amount of data up to a specified maximum to be sent across the network but there are no guarantees in terms of cell loss rate and delay. Compare with ABR, CBR, and VBR.

UPC—usage parameter control. See traffic policing.

VBR—variable bit rate. QoS class defined by the ATM Forum for ATM networks. VBR is subdivided into a real time (RT) class and non-real time (NRT) class. VBR (RT) is used for connections in which there is a fixed timing relationship between samples. VBR (NRT) is used for connections in which there is no fixed timing relationship between samples but that still need a guaranteed QoS. Compare with ABR, CBR, and UBR.

virtual circuit—Logical circuit created to ensure reliable communication between two network devices. A virtual circuit is defined by a VPI/VCI pair, and can be either permanent (PVC) or switched (SVC). Virtual circuits are used in Frame Relay and X.25. In ATM, a virtual circuit is called a virtual channel. Sometimes abbreviated VC.

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Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

© 2001-2002, 2009 Cisco Systems, Inc. All rights reserved.

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