ATM Policing by Service Category for SVC/SoftPVC
Feature History
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12.2(4)B |
This feature was introduced on the Cisco 6400 NSP. |
12.2(13)T |
This command was integrated into Cisco IOS Release 12.2(13)T. |
This module describes the ATM Policing by Service Category for SVC/SoftPVC feature in Cisco IOS Release 12.2(13)T and includes the following sections:
•Feature Overview
•Supported Platforms
•Supported Standards, MIBs, and RFCs
•Configuration Tasks
•Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC
•Configuration Examples
•Command Reference
Feature Overview
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.
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.
Benefits
This feature enables you to select which and how traffic is affected by UPC. For example, you can configure your switch to pass all UBR traffic, but tag all other traffic types.
Related Features and Technologies
•Intelligent early packet discard (EPD)
•Intelligent partial (tail) packet discard
Related Documents
•ATM Switch Router Software Configuration Guide
•ATM and Layer 3 Switch Router Command Reference
•Guide to ATM Technology
•ATM Forum UNI 3.1 Specification
Supported Platforms
This feature is supported on the node switch processor (NSP) of the Cisco 6400 carrier-class broadband aggregator.
Supported Standards, MIBs, and RFCs
Standards
None
MIBs
CISCO-ATM-IF-MIB.my—New objects were created for per-service category SVC UPC intent.
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
None
Configuration Tasks
See the following sections for configuration tasks for the ATM Policing by Service Category for SVC/SoftPVC feature.
•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
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Step 1 |
Switch(config)# interface atm slot/subslot/port |
Selects the ATM interface. |
Step 2 |
Switch(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 VC or VP.
Switch# show atm vc int atm 0/0/1 2 120
Interface:ATM0/0/1, Type:oc3suni
Time-since-last-status-change:1w1d
Cast-type:point-to-multipoint-leaf
Packet-discard-option:disabled
Usage-Parameter-Control (UPC):pass
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
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 affect after the VC is torn down and set up again.
Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC
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Switch# show atm interface |
Displays ATM-specific information about an ATM interface. |
Switch# show controllers atm slot/subslot/port |
Displays information about a physical port device. Includes dropped (or discarded) cells. |
Switch# 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 due to UPC violations. |
Example: Monitoring and Maintaining ATM Policing by Service Category for SVC/SoftPVC
Switch# show atm vc interface atm 3/0/1.51 51 16
Interface: ATM3/0/1.51, Type: oc3suni
Time-since-last-status-change: 2w0d
Cast-type: point-to-point
Packet-discard-option: enabled
Usage-Parameter-Control (UPC): pass
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 OAM-configuration: disabled
Cross-connect OAM-state: Not-applicable
Threshold Group: 6, Cells queued: 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 cdvt: 1024 (from default for interface)
Tx connection-traffic-table-index: 6
Tx service-category: UBR (Unspecified Bit Rate)
No AAL5 connection registered
Configuration Examples
This section provides the following configuration example:
•Example: Non-UBR Traffic Policing
Example: Non-UBR Traffic Policing
In the following example, the UBR traffic on ATM 3/0/0 is passed while all other traffic is policed:
Switch(config)# interface atm 3/0/0
Switch(config-if)# atm svc-upc-intent ubr pass
Switch(config-if)# atm svc-upc-intent cbr tag
Switch(config-if)# atm svc-upc-intent vbr-rt tag
Switch(config-if)# atm svc-upc-intent vbr-nrt tag
Switch(config-if)# atm svc-upc-intent abr drop
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 Quality of Service Solutions Command Reference at http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_book.html. For information about all Cisco IOS commands, use the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or a Cisco IOS master commands list.
•atm svc-upc-intent
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