CTSystems VRG-21412-WF-G-RF Router Manual PDF (Setup & Configuration Guide)

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Scenario V:

In this scenario, the WLAN Residential Gateway supports VoIP, IPTV application and

internet access. As illustrated in Figure 6, IPTV applications are connected to Port 1 (P1)

and Port 2 (P2); VoIP application is connected to Port 3 (P3) and one PC device is

connected to Port 4 (P4) to access the internet. If you would like the WLAN Residential

Gateway to control how much traffic gets forwarded for VoIP application (Port 5060) and

Internet access (Port 80) as wished (12Mbps for VoIP, 4Mbps for Internet), you can follow

the suggested setup steps below.

Step 1. Set Up NAT/Bridge Mode

In the scenario provided,

“

Mode 2: 3 WAN & 2 LAN

”

can be selected to group the WAN port,

Port 1 & 2 to Bridge Mode and Port 3 & 4 to NAT Mode.

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Step 2. Set Up Egress QoS Control

Egress QoS Control provides five bandwidth modes for users to set up the required

bandwidth based on the actual networking environment. In this scenario, the bandwidth

mode

“

By Application

”

can be used to prioritize the egress bandwidth to 12Mbps for VoIP

application and 4Mpbs for Internet access.

Select

“

By Application

”

:



Set up rule No.1for limiting VoIP Port 5000~5009 bandwidth.

-

Select

“

Destination or Source

”

. This means that both Destination Address and Source

Address with the specified port number will follow the bandwidth setting.

-

Set Port Start to 5000 and Port End to 5009.

-

Select Q3 (highest priority).



Set up rule No.2 for limiting Http Port 80 bandwidth.

-

Select

“

Destination or Source

”

. This means that both Destination Address and Source

Address with the specified port number will follow the bandwidth setting.

-

Set Port Start and Port End to 80.

-

Select Q2.

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58



Set up rule No.3 for limiting Https Port 443 bandwidth.

-

Select

“

Destination or Source

”

. This means that both Destination Address and Source

Address with the specified port number will follow the bandwidth setting.

-

Set Port Start and Port End to 443.

-

Select Q2.



Set Queue 2

’

s reserved bandwidth to 4096K.



Set Queue 3

’

s reserved bandwidth to 12288K.

2.6.6 Configure Q-in-Q

The IEEE 802.1Q double tagging VLAN is also referred to Q-in-Q or VLAN stacking (IEEE

802.1ad). Its purpose is to expand the 802.1q VLAN space by tagging the inner tagged

packets. In this way, a “double

-

tagged” frame is created

so as to separate customer traffic

within a service provider network. As shown below in

“

Double-Tagged Frame

”

illustration, an

outer tag is added between source destination and inner tag

at the provider network’s edge.

This can support C-VLAN (Customer VLAN) over Metro Area Networks and ensure

complete separation between traffic from different user groups. Moreover, the addition of

double-tagged space increases the number of available VLAN tags which allow service

providers to use a single SP-VLAN (Service Provider VLAN) tag per customer over the

Metro Ethernet network.

Preamble

SFD

D

A

S

A

Type/LEN

PAYLOAD

FCS

Original frame

Preamble

SFD

D

A

S

A

TAG

TCI/P/C/VID

Type/LEN

PAYLOAD

FCS

802.1q

Frame

Preamble

SFD

D

A

S

A

Outer Tag

or SP-Tag

Inner Tag

or C-Tag

TCI/P/C/VID

Type/LEN

PAYLOAD

FCS

Double-

tagged

Frame

Double-Tagged Frame

As shown below in

“

Q-in-Q Example

”

illustration, Headquarter A wants to communicate with

Branch 1 that is 1000 mile away. One common thing about these two locations is that they

have the same VLAN ID of 20, called C-VLAN (Customer VLAN). Since customer traffic will

be routed to service provider

’

s backbone, there is a possibility that traffic might be forwarded

insecurely, for example due to the same VLAN ID used. Therefore, in order to get the

information from Headquarter to Branch 1, the easiest way for the carrier to ensure security

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to customers is to encapsulate the original VLAN with a second VLAN ID of 100. This

second VLAN ID is known as SP-VLAN (Service Provider VLAN) that is added as data

enters the service provider

’

s network and then removed as data exits. Eventually, with the

help of SP-Tag, the information sent from Headquarter to Branch 1 can be delivered with

customers

’

VLANs intact and securely.

Q-in-Q Example

Q-in-Q Setup Steps:

Step 1. Set up Bridge/NAT Mode



Q-in-Q only works in ports that belong to Bridge Mode. Before going any further, please

make sure that the appropriate mode is selected.



Please make sure that packets received from Bridged ports already carry a tag (C-tag).

In this way, a second tag (SP-tag) can be added.

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Step 2. Enable Ingress Double Tag

Enable Ingress Double Tag on Bridged ports that you would like to add an additional tag

(SP-tag).

Step 3. Set up PVID

Set up a PVID. When packets received with a tag, the PVID will be added. In this example,

PVID 100 will be added (Inner tag+ PVID 100).

Step 4. Set up Egress Forwarding Table

Set up VID 100

’

s Egress Forwarding Table. WAN port must set to

“

T

”

(Tagged) to enable

the Gateway to deliver double-tagged packets. If

“

U

”

is assigned to WAN port, PVID will be

removed; therefore, packets with one tag are forwarded.

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