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Configuring You
r SmartRG™
- Common Use Cases
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11.
Click Add.
Figure 32 Defining an IPTV Bridge Interface Group
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12.
Enter the “Group Name.”
13.
Highlight the bridged “WAN Interfaces” to be included in the bridge group and click
<-.
14.
Highlight the LAN Interfaces to be included in the bridge group and click <-.
Figure 33 Typical IPTV Bridge Interface Group
15.
Click Apply/Save.
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- Common Use Cases
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Routed IPTV Configuration (Single WAN Connection)
The common routed IPTV configuration is virtually identical to the WAN connection configuration
for Internet data services with one notable exception; the addition of quality of service (QoS).
While not an absolute requirement, applying QoS to LAN traffic (with higher priority given to STBs)
ensures the timely and deterministic delivery of IPTV related uni-cast requests and IGMP signaling
through the gateway. This provides repeatable, shortest time possible channel changes in the
presence of other LAN traffic. A typical routed IPTV service configuration with only one WAN
connection is shown below.
Figure 34 Routed IPTV Configuration (Single WAN Connection)
To configure the SmartRG for routed IPTV service deployments:
1.
Ensure “IGMP Snooping” has been enabled on the LAN as detailed in, “
Use Case: Setting Up
the LAN
.”
2.
Create a routed WAN connection as detailed
in, “
Use Case: Creating WAN Connections for
Internet Access and Remote Management
.”
3.
(Optional) Create traffic classifiers and priority queues for the various traffic categories on
your LAN (e.g. Internet data, IPTV and VoIP) as detailed in, “
Use Case: Applying Quality of S
.”
NOTE
The SmartRG family of gateways employs “Differentiated Services” (RFC
2474) to
provide IP traffic QoS. When configuring QoS for various traffic categories the following
Differentiated Services Code Point (DSCP) values or suggested:
Internet data
Best Effort (DSCP 0)
IPTV
AF21 (DSCP 18)
VoIP
Expedited Forwarding (DSCP 46)
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NOTE
Some STBs pre-mark their IP traffic making classification a relatively straightforward
task for the gateway. If your STB pre-marks its traffic, passing the DSCP mark through
unchanged is suggested.
Routed IPTV Configuration (Multiple WAN Connections)
It is also possible to create routed IPTV configurations with multiple WAN connections. The notable
difference to typical routed IPTV configurations is the addition of one or more bridged WAN
connections to support multiple multicast IPTV streams. Again QoS is suggested. A typical multi-
WAN connection, routed IPTV service configuration is shown below.
Figure 35 Routed IPTV Configuration (Multiple WAN Connections)
To configure the SmartRG for multi-WAN connection, routed IPTV service deployments, follow the
single WAN connection, routed IPTV configuration instructions above
plus- add bridged WAN
connections using the instructions detailed in, “
Creating Bridged WAN Connections
.”
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Use Case: Applying Quality of Service (QoS) to VoIP and IPTV LAN Traffic
When deploying time critical services such as VoIP and IPTV comingled with common data services,
it becomes necessary to prioritize the time critical, upstream LAN traffic over common data traffic
(e.g Internet data and file transfers). Time critical traffic commonly includes SIP signaling (VoIP call
setup/teardown) and IGMP signaling (IPTV channel change). The SmartRG line of gateways
prioritizes time critical
traffic using the “Differentiated Services Code Point” field
in the IP header
as defined by RFC 2474.
NOTE
The residential gateway plays no part in the prioritization of downstream traffic.
Traffic generated by LAN hosts such as VoIP phones, IPTV STBs and PCs is identified
by “classifiers”
and placed into priori
tization “queues.” Queues are emptied through the routed WAN connection
based on queue priority. Classifiers can identify traffic based on a number of criteria including:
source/destination MAC address, source/destination IP address, protocol, DSCP mark, etc. This
section describes a
typical
QoS configuration to prioritized upstream VoIP and IPTV traffic.
A
typical
VoIP/IPTV/data QoS configuration is shown below:
Figure 36 Typical QoS configuration to support VoIP and IPTV services
VoIP traffic is identified by its source MAC/Mask (VoIP user agent OUI) and IPTV traffic is identified
by the DSCP mark in its IP header. All remaining traffic is placed in the data (default) queue.
NOTE
Mediaroom based IPTV STBs place the DSCP18 mark on all upstream traffic.
The QoS configuration process is comprised of three main steps:
Enable QoS on the routed WAN connection and enable QoS processing
Create traffic queues to prioritize the different types of traffic
and-
Create traffic classifiers to identify the different types of traffic

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