SmartRG SR500N Router Manual PDF (Setup & Configuration Guide)

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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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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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