COPS Engine Operation

This document describes the Common Open Policy Service (COPS) engine feature on the Cisco CMTS routers. The Cisco CMTS routers also support Access control lists (ACLs) with the COPS engine.

Finding Feature Information

Your software release may not support all the features that are documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. The Feature Information Table at the end of this document provides information about the documented features and lists the releases in which each feature is supported.

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

Hardware Compatibility Matrix for the Cisco cBR Series Routers


Note
The hardware components that are introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified.
Table 1. Hardware Compatibility Matrix for the Cisco cBR Series Routers

Cisco CMTS Platform

Processor Engine

Interface Cards

Cisco cBR-8 Converged Broadband Router

Cisco IOS-XE Release 16.5.1 and Later Releases

Cisco cBR-8 Supervisor:

  • PID—CBR-SUP-250G

  • PID—CBR-CCAP-SUP-160G

Cisco IOS-XE Release 16.5.1 and Later Releases

Cisco cBR-8 CCAP Line Cards:

  • PID—CBR-LC-8D30-16U30

  • PID—CBR-LC-8D31-16U30

  • PID—CBR-RF-PIC

  • PID—CBR-RF-PROT-PIC

  • PID—CBR-CCAP-LC-40G

  • PID—CBR-CCAP-LC-40G-R

  • PID—CBR-CCAP-LC-G2-R

  • PID—CBR-SUP-8X10G-PIC

  • PID—CBR-2X100G-PIC

Digital PICs:

  • PID—CBR-DPIC-8X10G

  • PID—CBR-DPIC-2X100G

Cisco cBR-8 Downstream PHY Module:

  • PID—CBR-D31-DS-MOD

Cisco cBR-8 Upstream PHY Modules:

  • PID—CBR-D31-US-MOD

Note

Do not use DPICs (8X10G and 2x100G) to forward IP traffic, as it may cause buffer exhaustion, leading to line card reload.

The only allowed traffic on a DPICs DEPI, UEPI, and GCP traffic from the Cisco cBR-8 router to Remote PHY devices. Other traffic such as DHCP, SSH, and UTSC should flow via another router, since DPICs cannot be used for normal routing.

Prerequisites for the COPS Engine on the Cisco CMTS Routers

  • A compatible policy server must be connected to the network, such as the Cisco COPS QoS Policy Manager.
  • Compliance with administrative policy, such as the Computer Assisted Law Enforcement Act (CALEA) or other lawful intercept (LI), is required for use of this feature on the Cisco CMTS routers.

Restrictions for the COPS Engine on the Cisco CMTS

  • Resource Reservation Protocol (RSVP) is not configured on the Cisco CMTS. COPS engine configuration on the Cisco CMTS is limited to networks in which separate RSVP and COPS Servers are configured and operational.

Information About the COPS Engine on the Cisco CMTS

Common Open Policy Service (COPS) is a protocol for communicating network traffic policy information to network devices.

COPS works in correspondence with the Resource Reservation Protocol (RSVP), which is a means for reserving network resources—primarily bandwidth—to guarantee that applications sending end-to-end across the Internet will perform at the desired speed and quality. RSVP is not configured on the Cisco CMTS, but the Cisco CMTS presumes RSVP on the network for these configurations.

Refer to the Additional References for further information about COPS for RSVP.

How to Configure the COPS Engine on the Cisco CMTS

This section describes the tasks for configuring the COPS for RSVP feature on the Cisco CMTS.

To configure the COPS engine on the Cisco CMTS, perform the following tasks:

Configuring COPS TCP and DSCP Marking

This feature allows you to change the Differentiated Services Code Point (DSCP) marking for COPS messages that are transmitted or received by the Cisco router. The cops ip dscp command changes the default IP parameters for connections between the Cisco router and COPS servers in the cable network.

DSCP values are used in Quality of Service (QoS) configurations on a Cisco router to summarize the relationship between DSCP and IP precedence. This command allows COPS to remark the packets for either incoming or outbound connections.

The default setting is 0 for outbound connections. On default incoming connections, the COPS engine takes the DSCP value from the COPS server initiating the TCP connection.


Note
This feature affects all TCP connections with all COPS servers.
  • For messages transmitted by the Cisco router, the default DSCP value is 0.
  • For incoming connections to the Cisco router, the COPS engine takes the DSCP value used by the COPS server that initiates the TCP connection, by default.
  • The cops ip dscp command allows the Cisco router to re-mark the COPS packets for either incoming or outbound connections.
  • This command affects all TCP connections with all COPS servers.
  • This command does not affect existing connections to COPS servers. Once you issue this command, this function is supported only for new connections after that point in time.

Perform the following steps to enable optional DSCP marking for COPS messages on the Cisco CMTS.

Procedure

  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

cops ip dscp [<0-63 > | default | af11-af43 | cs1-cs7 ]

Example:


Router(config)# cops ip dscp default

Specifies the marking for COPS messages that are transmitted by the Cisco router.

The values for this command specify the markings with which COPS messages are transmitted. The following values are supported for the Cisco CMTS router:

  • 0-63 —DSCP value ranging from 0-63.
  • af11 —Use AF11 dscp (001010)
  • af12 —Use AF12 dscp (001100)
  • af13 —Use AF13 dscp (001110)
  • af21 —Use AF21 dscp (010010)
  • af22 —Use AF22 dscp (010100)
  • af23 —Use AF23 dscp (010110)
  • af31 —Use AF31 dscp (011010)
  • af32 —Use AF32 dscp (011100)
  • af33 —Use AF33 dscp (011110)
  • af41 —Use AF41 dscp (100010)
  • af42 —Use AF42 dscp (100100)
  • af43 —Use AF43 dscp (100110)
  • cs1 —Use CS1 dscp (001000) [precedence 1]
  • cs2 —Use CS2 dscp (010000) [precedence 2]
  • cs3 —Use CS3 dscp (011000) [precedence 3]
  • cs4 —Use CS4 dscp (100000) [precedence 4]
  • cs5 —Use CS5 dscp (101000) [precedence 5]
  • cs6 —Use CS6 dscp (110000) [precedence 6]
  • cs7 —Use CS7 dscp (111000) [precedence 7]
  • default —Use default dscp (000000)
  • ef —Use EF dscp (101110)

Step 4

exit

Example:


Router(config)# exit
Router#

Returns to privileged EXEC mode.

Configuring COPS TCP Window Size

This feature allows you to override the default TCP receive window size that is used by COPS processes. This setting can be used to prevent the COPS server from sending too much data at one time.

Perform the following steps to change the TCP Window size on the Cisco CMTS.

Procedure

  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

cops tcp window-size bytes

Example:



Router(config)# cops tcp window-size 64000

Overrides the default TCP receive window size on the Cisco CMTS. To return the TCP window size to a default setting of 4K, use the no form of this command.

Note

 
The default COPS TCP window size is 4000 bytes.

Note

 
This command does not affect existing connections to COPS servers. Once you issue this command, this function is supported only for new connections after that point in time.

Note

 
This command affects all TCP connections with all COPS servers.

Step 4

exit

Example:


Router(config)# exit
Router#

Returns to privileged EXEC mode.

Configuring Access Control List Support for COPS Engine

Perform the following steps to configure COPS ACLs on the Cisco CMTS.

Procedure

  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

cops listeners access-list{ acl-num |acl-name }

Example:


Router# cops listeners access-list 40

Configures access control lists (ACLs) for inbound connections to all COPS listener applications on the Cisco CMTS. To remove this setting from the Cisco CMTS, us the no form of this command.

Step 4

exit

Example:


Router(config)# exit
Router#

Returns to privileged EXEC mode.

What to do next

Access lists can be displayed by using the show access-list command in privileged EXEC mode.

Restricting RSVP Policy to Specific Access Control Lists

Perform the following steps to restrict the RSVP policy to specific ACLs, as already configured on the Cisco CMTS.

For ACL configuration, refer to the Configuring Access Control List Support for COPS Engine.

Procedure

  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 cable (slot /subslot /port }

Example:


Router(config)#interface cable 8/0/1
Router(config-if)#

Enters interface configuration mode.

Step 4

ip rsvp policy cops ACL-1 ACL-2 servers iP-addr1 IP-addr2

Example:


Router(config-if)# ip rsvp policy cops 40 160 servers 161.44.130.164 161.44.129.2

Tells the router to apply RSVP policy to messages that match the specified ACLs, and specifies the COPS server or servers for those sessions.

Step 5

exit

Example:


Router(config)# exit
Router#

Returns to privileged EXEC mode.

Displaying and Verifying COPS Engine Configuration on the Cisco CMTS

Once COPS is enabled and configured on the Cisco CMTS, you can verify and track configuration by using one or all of the show commands in the following steps.

Procedure

  Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

show cops servers

Example:


Router# show cops servers

Displays server addresses, port, state, keepalives, and policy client information.

Step 3

show ip rsvp policy cops

Example:


Router# show ip rsvp policy cops

Displays policy server addresses, ACL IDs, and client/server connection status.

Step 4

show ip rsvp policy

Example:


Router# show ip rsvp policy

Displays ACL IDs and their connection status.

Show Commands for COPS Engine Information

The following examples display three views of the COPS engine configuration on the Cisco router. These respective show commands verify the COPS engine configuration.

Displaying COPS Servers on the Network

This example displays the policy server address, state, keepalives, and policy client information: 


Router# show cops servers
COPS SERVER: Address: 161.44.135.172. Port: 3288. State: 0. Keepalive: 120 sec
Number of clients: 1. Number of sessions: 1. 
    COPS CLIENT: Client type: 1.  State: 0.

Displaying COPS Policy Information on the Network

This example displays the policy server address, the ACL ID, and the client/server connection status: 


Router# show ip rsvp policy cops
COPS/RSVP entry. ACLs: 40 60 
PDPs: 161.44.135.172 
Current state: Connected
Currently connected to PDP 161.44.135.172, port 0

Displaying Access Lists for COPS

This example displays the ACL ID numbers and the status for each ACL ID: 


Router# show ip rsvp policy
Local policy: Currently unsupported
COPS: 
ACLs: 40 60 . State: CONNECTED. 
ACLs: 40 160 . State: CONNECTING.

COPS Engine Configuration Examples for Cable

The following sections provide COPS for RSVP configuration examples on the Cisco CMTS:

Example: COPS Server Specified

The following example specifies the COPS server and enables COPS for RSVP on the server. Both of these functions are accomplished by using the ip rsvp policy cops command. By implication, the default settings for all remaining COPS for RSVP commands are accepted. 


Router# configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)# ip rsvp policy cops servers 161.44.130.168 161.44.129.6
Router(config)# exit

Example: COPS Server Display

The following examples display three views of the COPS for RSVP configuration on the router, which can be used to verify the COPS for RSVP configuration.

This example displays the policy server address, state, keepalives, and policy client information: 


Router# show cops servers
COPS SERVER: Address: 161.44.135.172. Port: 3288. State: 0. Keepalive: 120 sec
Number of clients: 1. Number of sessions: 1. 
    COPS CLIENT: Client type: 1.  State: 0.

This example displays the policy server address, the ACL ID, and the client/server connection status: 


Router# show ip rsvp policy cops
COPS/RSVP entry. ACLs: 40 60 
PDPs: 161.44.135.172 
Current state: Connected
Currently connected to PDP 161.44.135.172, port 0

This example displays the ACL ID numbers and the status for each ACL ID: 


Router# show ip rsvp policy
Local policy: Currently unsupported
COPS: 
ACLs: 40 60 . State: CONNECTED. 
ACLs: 40 160 . State: CONNECTING.

Additional References

Related Documents

Related Topic

Document Title

Cisco CMTS Commands

Cisco CMTS Cable Command Reference

COPS for RSVP

  • Configuring COPS for RSVP

http://www.cisco.com/en/US/docs/ios-xml/ios/qos_rsvp/configuration/12-4t/cops_rsvp.html

  • COPS for RSVP

http://www.cisco.com/en/US/docs/ios/12_1t/12_1t1/feature/guide/CopsRSVP.html

Standards

Standard

Title

PKT-SP-ESP-I01-991229

PacketCable™ Electronic Surveillance Specification ( http://www.packetcable.com )

MIBs

MIB

MIBs Link

  • No MIBs have been introduced or enhanced for support of this feature.

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

General RFC Resources

  • RFC Index Search Engine

http://www.rfc-editor.org/rfcsearch.html

  • SNMP: Frequently Asked Questions About MIB RFCs

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_q_and_a_item09186a00800c2612.shtml

Technical Assistance

Description

Link

The Cisco Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport

Feature Information for COPS Engine Operation

Use Cisco Feature Navigator to find information about the platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to the https://cfnng.cisco.com/ link. An account on the Cisco.com page is not required.


Note

The following table lists the software release in which a given feature is introduced. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Table 2. Feature Information for COPS Engine Operation

Feature Name

Releases

Feature Information

COPS Engine Operation

Cisco IOS XE Everest 16.6.1

This feature was integrated into Cisco IOS XE Everest 16.6.1 on the Cisco cBR Series Converged Broadband Routers.