This feature enables the operator to scramble the video sessions on the chassis. It involves the configuration to establish a connection with the Entitlement Control Message Generator (ECMG) and the Event Information Scheduler (EIS).

The two primary modes of scrambling are: session based scrambling and tier-based scrambling. The basic difference between the two modes is that the manner in which the Entitlement Control Messages (ECM) are requested from the ECMG. For session based scrambling, a control word (CW) is generated once every Crypto Period (CP) and the ECM is requested for each session. For tier-based scrambling, the control word is generated once every CP and the ECM generated by the ECMG for the CW is used by all the sessions in the chassis.

The connection with the external EIS Server is established via the Virtual Port Group in the Supervisor. The connection with the external ECMG server is established via the linecard.

The fail-to-clear-duration feature is supported on DVB sessions and DualCrypt encryption modes. Based on the session encryption, the following two features are supported on the Cisco cBR Series Converged Broadband Routers.

The connection with the external ECMG server is established via the Virtual Port Group in the Supervisor.

• This feature is applicable only for remapped table based sessions.

• Fail-to-clear-duration feature is applicable only to session-based scrambling for DVB CAS encryption.

• Fail-to-clear feature is applicable only to DVB tier-based scrambling sessions.

Before You Begin

• Virtual Port Group interface must be configured and the management IP for DVB must be identified.

• Management interface is set to this Virtual Port Group interface under cable video configuration.

• Logical Edge Device is configured with the table based protocol.

• The encryption algorithm of the linecard is set to DVB-CSA.

• For session based scrambling, the CA interface on the linecard and the route for reaching the ECMG server must be specified.

To configure session based scrambling, follow the steps below:

enable
config terminal
  interface int_id
    vrf forwarding vrf_script_red_1
    ip address ip-address subnet-mask 
    no mop enabled
    no mop sysid
    exit
  cable video
    mgmt-intf VirtualPortGroup group_id
    encryption
      linecard slot/bay ca-system dvb scrambler dvb-csa 
      dvb
        route-ecmg ECMG_Server_IP_Address Netmask Interface Forwarding_Router_IP_Address 
        mgmt-ip management ip address
        eis EIS_name id EIS_id
          listening-port <1-65535> bind led id <led id | led name>
        ca-interface linecard slot/bay IP_Address
        ecmg ECMG_Name id ECMG_ID
          mode vod linecard slot/bay
          type standard
          ca-system-id CA_System_ID CA_Subsystem_ID
          auto-channel-id
          ecm-pid-source sid
          connection id ID priority connection_priority IP_Address Port
    service-distribution-group sdg name id SDG ID onid onid number 
      rpd downstream-cable slot/subslot/bay
    virtual-carrier-group vcg-name id vcg_id
      encrypt
      service-type narrowcast
      rf-channel channel tsid tsid_number output-port-number number
    bind-vcg
      vcg vcg-name sdg sdg-name
    logical-edge-device led-name id led_id
      protocol gqi
        mgmt-ip IP_Address
        mac-address MAC address
        server server_ip_address
        keepalive retry 3 interval 10
        reset interval 8        
        virtual-edge-input-ip IP address input-port-number 1
        vcg vcg-name
        active 

The fail-to-clear-duration is measured in seconds. The valid values are in the range from 0 to 10800 seconds. The default value is 0.

enable
config terminal
  interface VirtualPortGroup group_id
    vrf forwarding Mgmt-intf
    ip address ip-address subnet-mask 
    no mop enabled
    no mop sysid
    exit

  cable video
    mgmt-intf VirtualPortGroup group_id
    encryption
      linecard slot/bay ca-system dvb scrambler dvb-csa 
      dvb
        route-ecmg ECMG_Server_IP_Address Netmask Interface Forwarding_Router_IP_Address 
        ecmg ECMG_Name id ECMG_ID
          mode tier-based
          type standard
          ca-system-id CA_System_ID CA_Subsystem_ID
          auto-channel-id
          ecm-pid-source sid
          connection id ID priority connection_priority IP_Address Port
        tier-based
          ecmg id ECMG_ID access- criteria access_criteria_in_hex 
          fail-to-clear
          enable
    service-distribution-group sdg name id SDG ID onid onid number
      rpd downstream-cable slot/subslot/port
    virtual-carrier-group vcg-name id vcg_id
      encrypt
      service-type narrowcast
      rf-channel channel tsid tsid_number output-port-number number
    bind-vcg
      vcg vcg-name sdg sdg-name
    logical-edge-device led-name id led_id
      protocol table-based
        virtual-edge-input-ip IP address input-port-number 1
        vcg vcg-name
        active
    table-based
      vcg vcg-name
        rf-channel channel
          session session_name input-port id start-udp-port udp port number processing-type remap start-program 1 cbr
 

Note	If the tier-based configuration is already enabled, you must first disable the tier-based configuration using the no enable , before you configure fail-to-clear feature.

To verify the configuration of the encryption algorithm on the linecard, use the show cable video encryption linecard command as shown in the example below:

Router# show cable video encryption linecard 7/0
Line card: 7/0
CA System       Scrambler       DVB-Conformance
===============================================
dvb             dvb-csa         Enabled 

To verify the ECMG connection, use the show cable video encryption dvb ecmg id id connection command as shown in the example below:

Router# show cable video encryption dvb ecmg id 1 connection
------------------------------------------------------------------------------------------------------------------------------
ECMG ECMG           ECMG     CA Sys CA Subsys PID    Lower Upper Streams/ Open Streams/ Auto Chan Slot ECMG        ECMG
ID   Name           Type     ID     ID        Source limit limit ECMG     ECMG          ID             Connections Application
------------------------------------------------------------------------------------------------------------------------------
1    polaris_ecmg01 standard 0x4748 0x0       sid    0     0     1        1             Enabled   RP   1           Tier-Based

ECMG Connections for ECMG ID = 1

----------------------------------------------------------
Conn Conn     IP          Port    Channel  Conn    Open
-ID  Priority Address     Number  ID       Status  Streams
----------------------------------------------------------
1    1        10.10.1.1  8888    1        Open    1

The sample output of the session based scrambling configuration verification command is shown below:

Router# show cable video encryption dvb ecmg id 7 connection
------------------------------------------------------------------------------------------------------------------------------
ECMG ECMG           ECMG     CA Sys CA Subsys PID    Lower Upper Streams/ Open Streams/ Auto Chan Slot ECMG        ECMG
ID   Name           Type     ID     ID        Source limit limit ECMG     ECMG          ID             Connections Application
------------------------------------------------------------------------------------------------------------------------------
7    ecmg-7         standard 0x950  0x1234    sid    0     0     1680     1680          Enabled   7    1           VOD

ECMG Connections for ECMG ID = 1

----------------------------------------------------------
Conn Conn     IP          Port    Channel  Conn    Open
-ID  Priority Address     Number  ID       Status  Streams
----------------------------------------------------------
1    1        10.10.1.10  8888    1        Open    1

The status of the connection with the ECMG Server is indicated by the Conn Status. The Open Streams field indicates the number of Active ECM Streams.

To verify the EIS connection, use the show cable video encryption dvb eis id id command as shown in the example below:

Router# show cable video encryption dvb eis id 1
----------------------------------------------------------------------------------------
EIS EIS  Peer       Management TCP  CP       CP       Overwrite Fail-To-Clear Connection  
ID  Name IP         IP         Port Overrule Duration SCG       Duration      Status      
------------------------------------------------------------------------------------
1   test 10.10.1.11 10.10.1.1  9898 DISABLED 0        DISABLED  400           Connected

To verify the CA Interface configuration in the case of session based scrambling, use the show cable video encryption dvb ca-interface brief command as shown in the example below:

Router# show cable video encryption dvb ca-interface brief
CA Interface configuration

------------------------------
Linecard    IP Address    VRF
------------------------------
7           10.10.1.1     N/A

ECMG Route configuration

-----------------------------------------------------
IP Address    NetMast         Interface
-----------------------------------------------------
10.10.1.10    255.255.255.224   TenGigabitEthernet4/1/2

To verify the encryption status of the sessions, use the show cable video session logical-edge-device id command as shown in the example below:

Router# show cable video session logical-edge-device id 1
Total Sessions = 1

Session Output Streaming Session Session Source                UDP   Output  Input      Output Input   Output  Encrypt Encrypt   Low     Session
Id      Port   Type      Type    Ucast Dest IP/Mcast IP (S, G) Port  Program State      State  Bitrate Bitrate Type    Status    Latency Name
--------------------------------------------------------------------------------------------------------------------------------------------------------------
1048576 1      Remap     UDP     10.10.1.1                   49167 20      ACTIVE-PSI        1695161 1689747 DVB     Encrypted N       dvbsess.1.0.1.0.23167

To verify the ECM PID and whether the CA Descriptor is added to the PMT, use the show cable video session logical-edge-device id session-id command as shown in the example below:

Router# show cable video session logical-edge-device id 1 session-id 1048576
Output PMT Info:
==============================
  Program 20, Version 3, PCR 49, Info len 18,  (CA SYS-ID 4748, PID 79)
  PID 49: Type 2, Info len 0
  PID 50: Type 3, Info len 6, (lang eng)

If some configuration errors occur, see the following troubleshooting tips:

• The Management IP must be unique and in the subnet of virtual port group.

• Ensure that the ECMG Server is pingable with source interface as the virtual port group from the Cisco cBR-8 console. This indicates that the ECMG Server is reachable and route is valid.

• Ensure that the TCP port number configured for the ECMG Server in the Cisco cBR-8 is the same as that of the ECMG Server listening port.

• Ensure that the management IP is pingable from the EIS Server. Otherwise, check the routing between the cBR-8 chassis and the EIS server.

• Ensure that the listening port that is configured for the EIS is used for establishing the connection from the EIS Server.

• Ensure that the Virtual Port Group interface is active.

• Ensure that the TenGigabitEthernet interface using which the management traffic reaches the Cisco cBR-8 and the interface through which the CA interface route is configured are active.