Chapter 19: DOCSIS Set-top Gateway Configuration
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Choose A or B below to enable (A) IGMPv2 Proxy, or (B) PIM-SSM multicast, for each NSI that is required to receive
DSG tunnel traffic.
2.
Enabling IGMPv2 Proxy from the Cable Side to Network Side
Use the following commands to enable IGMPv2 Proxy:
a.
For each DS cable interface that needs to carry multicast DSG tunnel traffic, a proxy interface must be assigned for
receiving the multicast traffic.
configure interface cable-mac <mac>[<.subif#>] ip igmp proxy-interface {gigabitethernet
<slot>/<port>[<.subif#>] | tengigabitethernet <slot>/<port>[<.subif#>]}
b.
A backup proxy interface may also be configured:
configure interface cable-mac <mac>[<.subif#>] ip igmp backup-proxy-interface {gigabitethernet
<slot>/<port>[<.subif#>] | tengigabitethernet <slot>/<port>[<.subif#>]}
c.
The command to display the IGMP configuration for an interface is:
show ip igmp interfaces
3.
Enabling PIM-SSM
Note PIM-SSM source specific multicast group joins are automatically configured for DSG tunnel classifiers that have a
source-network prefix of 32 (host address), but are not automatically configured for DSG tunnel classifiers that use a
source network prefix less than 32 (subnet).
For DSG tunnel classifiers configured with a source-network prefix of less than 32 (subnet), a source-specific group
static join must be configured for each source in the subnet where multicast group static join can be configured using
the following command:
configure interface cable-downstream <slot>/<port> ip igmp static-group <group> [source <source>]
Note: Static joins can be configured on various types of interfaces. There are cable-side interfaces (cable-mac and cable-
downstream). There are network-side interfaces (gigabit- and tengigabit-ethernet). Also, there are layer 2 and layer 3
forms of the static join commands. For more information, see
Note: PIM-SSM and IGMP Proxy cannot be configured on the same network-side interface. Also, some combinations of
DSG using SSM or ASM are not supported with IGMPv2 or IGMPv3 in the same cable-side MAC domain. For additional
information, see
(page 778)
PIM-SSM forwarding is not enabled until PIM neighbors are established. Use show ip pim neighbor to show PIM neighbors
on an interface.