Zyxel VMG8924-B30A Router Manual PDF (Setup & Configuration Guide)

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8.4.1

Add/Edit Policy Forwarding

Click

Add new Policy Forward Rule

in the

Policy Forwarding

screen or click the

Edit

icon next

to a policy. Use this screen to configure the required information for a policy route.

Figure 71

Policy Forwarding: Add/Edit

The following table describes the labels in this screen.

WAN

This is the WAN interface through which the traffic is routed.

Modify

Click the

Edit

icon to edit this policy.

Click the

Delete

icon to remove a policy from the Device. A window displays asking you to

confirm that you want to delete the policy.

Table 43

Network Setting > Routing >Policy Forwarding (continued)

LABEL

DESCRIPTION

Table 44

Policy Forwarding: Add/Edit

LABEL

DESCRIPTION

Policy Name

Enter a descriptive name of up to 8 printable English keyboard characters, not including

spaces.

Source IP

Enter the source IP address.

Source Subnet

Mask

Enter the source subnet mask address.

Protocol

Select the transport layer protocol (

TCP

or

UDP

).

Source Port

Enter the source port number.

Source MAC

Enter the source MAC address.

WAN

Select a WAN interface through which the traffic is sent. You must have the WAN

interface(s) already configured in the

Broadband

screens.

Apply

Click

Apply

to save your changes.

Cancel

Click

Cancel

to exit this screen without saving.

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8.5

RIP

Routing Information Protocol (RIP, RFC 1058 and RFC 1389) allows a device to exchange routing

information with other routers.

8.5.1

The RIP Screen

Click

Network Setting > Routing >

RIP

to open the

RIP

screen.

Figure 72

RIP

The following table describes the labels in this screen.

Table 45

RIP

LABEL

DESCRIPTION

#

This is the index of the interface in which the RIP setting is used.

Interface

This is the name of the interface in which the RIP setting is used.

Version

The RIP version controls the format and the broadcasting method of the RIP

packets that the Device sends (it recognizes both formats when receiving). RIP

version

1

is universally supported but RIP version

2

carries more information. RIP

version

1

is probably adequate for most networks, unless you have an unusual

network topology.

Operation

Select

Passive

to have the Device update the routing table based on the RIP

packets received from neighbors but not advertise its route information to other

routers in this interface.

Select

Active

to have the Device advertise its route information and also listen for

routing updates from neighboring routers.

Enabled

Select the check box to activate the settings.

Apply

Click

Apply

to save your changes back to the Device.

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Page 139 / 412

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C

HAPTER

9

Quality of Service (QoS)

9.1

Overview

Quality of Service (QoS) refers to both a network’s ability to deliver data with minimum delay, and

the networking methods used to control the use of bandwidth. Without QoS, all traffic data is

equally likely to be dropped when the network is congested. This can cause a reduction in network

performance and make the network inadequate for time-critical application such as video-on-

demand.

Configure QoS on the Device to group and prioritize application traffic and fine-tune network

performance. Setting up QoS involves these steps:

1

Configure classifiers to sort traffic into different flows.

2

Assign priority and define actions to be performed for a classified traffic flow.

The Device assigns each packet a priority and then queues the packet accordingly. Packets assigned

a high priority are processed more quickly than those with low priority if there is congestion,

allowing time-sensitive applications to flow more smoothly. Time-sensitive applications include both

those that require a low level of latency (delay) and a low level of jitter (variations in delay) such as

Voice over IP (VoIP) or Internet gaming, and those for which jitter alone is a problem such as

Internet radio or streaming video.

This chapter contains information about configuring QoS and editing classifiers.

9.1.1

What You Can Do in this Chapter

• The

General

screen lets you enable or disable QoS and set the upstream bandwidth (

Section 9.3

on page 141

).

• The

Queue Setup

screen lets you configure QoS queue assignment (

Section 9.4 on page 142

).

• The

Class Setup

screen lets you add, edit or delete QoS classifiers (

Section 9.5 on page 144

).

• The

Policer Setup

screen lets you add, edit or delete QoS policers (

Section 9.5 on page 144

).

9.2

What You Need to Know

The following terms and concepts may help as you read through this chapter.

QoS versus Cos

QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given

the same priority. CoS (class of service) is a way of managing traffic in a network by grouping

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similar types of traffic together and treating each type as a class. You can use CoS to give different

priorities to different packet types.

CoS technologies include IEEE 802.1p layer 2 tagging and DiffServ (Differentiated Services or DS).

IEEE 802.1p tagging makes use of three bits in the packet header, while DiffServ is a new protocol

and defines a new DS field, which replaces the eight-bit ToS (Type of Service) field in the IP header.

Tagging and Marking

In a QoS class, you can configure whether to add or change the DSCP (DiffServ Code Point) value,

IEEE 802.1p priority level and VLAN ID number in a matched packet. When the packet passes

through a compatible network, the networking device, such as a backbone switch, can provide

specific treatment or service based on the tag or marker.

Traffic Shaping

Bursty traffic may cause network congestion. Traffic shaping regulates packets to be transmitted

with a pre-configured data transmission rate using buffers (or queues). Your Device uses the Token

Bucket algorithm to allow a certain amount of large bursts while keeping a limit at the average rate.

Traffic Policing

Traffic policing is the limiting of the input or output transmission rate of a class of traffic on the

basis of user-defined criteria. Traffic policing methods measure traffic flows against user-defined

criteria and identify it as either conforming, exceeding or violating the criteria.

The Device supports three incoming traffic metering algorithms: Token Bucket Filter (TBF), Single

Rate Two Color Maker (srTCM), and Two Rate Two Color Marker (trTCM). You can specify actions

Traffic

Time

Traffic Rate

Traffic

Time

Traffic Rate

(Before Traffic Shaping)

(After Traffic Shaping)

Traffic

Time

Traffic Rate

Traffic

Time

Traffic Rate

(Before Traffic Policing)

(After Traffic Policing)

Rate

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