Similar to table-based unicast session configuration, sessions can be configured as individual sessions under each QAM carrier that is assigned to a table-based LED. To configure multicast video session, you must configure a port-channel interface.

A multicast session can be configured with a single input multicast input source or multiple input sources for backup purpose. For multiple backup sources, a label is required to be associated with the session configuration. Same label can be applied to multiple sessions on different QAM channel. These sessions are considered as cloned sessions.

For session cloning on multiple QAMs within the same line card, only one copy of the traffic is forwarded to the line card. The line card replicates the input packets and forwards them to multiple QAMs. Each cloned copy of a remapped session will have the same or different output program number.

The Cisco cBR-8 router supports multicast MPTS pass-session type. For a pass-through session:

• The PMT and other program data are not changed.

• PID remapping is not performed.

• Input NULL packets are dropped.

• Oversubscription results in random TP dropping, and all ghost PIDs are preserved in the output.

The following example shows how to configure a port-channel interface.

interface Port-channel27
description connection for Core A
ip address 2.27.1.1 255.255.255.252
ip pim sparse-mode
ip access-group 101 out
ip igmp version 3
ip ospf 64512 area 27
load-interval 30
carrier-delay msec 500

The following example shows how to configure the pre-encrypted Broadcast Video sessions on Cisco cBR routers.

cable video
multicast-uplink Port-channel32 access-list all-multicasts 

table-based
   multicast-label label group group-ip source source-ip source2 source-ip source3 source-ip source4 source-ip 
   multicast-label label group group-ip source source-ip source2 source-ip source3 source-ip source4 source-ip 
 
   vcg vcg-name
  rf-channel channel
    session session-name multicast-label label processing-type {remap | passthru | data} cbr
  rf-channel channel
    session session-name multicast-label label processing-type {remap | passthru | data} cbr

The Service Distribution Group (SDG) defines the physical slot/bay/port to be used in a video service. After you configure an SDG, you can bind a VCG to an SDG. The binding connects the carriers defined in the VCG to the physical port listed in the SDG. After binding, a path from the Virtual Edge Input (VEI) is mapped to the RF channels.

The following example shows how to configure the SDGs and binding:

configure terminal 
cable video
service-distribution-group sdg99 id 99
    rpd downstream-cable 9/0/31

  virtual-carrier-group vcg99 id 99
    service-type broadcast
    rf-channel 64-78 tsid 38901-38915 output-port-number 1-15
    rf-channel 80-127 tsid 38917-38964 output-port-number 17-64

  bind-vcg
    vcg vcg99 sdg sdg99

logical-edge-device led31 id 31
protocol table-based
vcg vcg99
active