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 
configure terminal 
cable video 
mgmt-intf VirtualPortGroup group_id 
encryption 
linecardslot/bay ca-system dvb scrambler dvb-csa 
dvb 
route-ecmg ECMG_Server_IP_Address Netmask Interface Forwarding_Router_IP_Address 
mgmt-ip ip-address 
eis EIS_Name id EIS_ID 
listening-port port_number 
fail-to-clear-duration < duration in seconds> 
ca-interface linecardslot/bay IP_Address 
ecmg ECMG_Name id ECMG_ID 
mode vod linecardslot/bay 
type [standard | hitachi | irdeto | nagra| pkey] 
ca-system-id CA_System_ID CA_Subsystem_ID 
ecm-pid-source [sid | auto | ecm-id | min-ecm-pid | max-ecm-pid] 
connection id id priority connection_priority IP_Address Port 

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.

To configure tier based scrambling, follow the steps below:

enable 
configure terminal 
cable video 
mgmt-intf VirtualPortGroup group_id 
encryption 
linecardslot/bay ca-system dvb scrambler dvb-csa 
dvb 
mgmt-ip ip-address 
ecmg ECMG_Name id ECMG_ID 
mode tier-based 
type [standard | hitachi | irdeto | nagra| pkey] 
ca-system-id CA_System_ID CA_Subsystem_ID 
ecm-pid-source [sid | auto | ecm-id] 
connection id id priority connection_priority IP_Address Port 
tier-based 
ecmg id ECMG_ID access-criteriaaccess_criteria_in_hex 
fail-to-clear 
enable 

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.