Bandwidth Management Examples - ZyXEL Communications ISG50-ISDN User Manual

Integrated service gateway

Hide thumbs Also See for ISG50-ISDN:

Table of Contents

Priority and Over Allotment of Bandwidth Effect

Server A has a configured rate that equals the total amount of available bandwidth and a higher

priority. You should regard extreme over allotment of traffic with different priorities (as shown here)

as a configuration error. Even though the ISG50 still attempts to let all traffic get through and not

be lost, regardless of its priority, server B gets almost no bandwidth with this configuration.

Table 132 Priority and Over Allotment of Bandwidth Effect

Finding Out More

Section 7.5 on page 116

restrictions.

DSCP Marking and Per-Hop Behavior on page 291

25.1.3 Bandwidth Management Examples

Bandwidth management is very useful when applications are competing for limited bandwidth. For

example, say you have a WAN zone interface connected to an ADSL device with a 8 Mbps

downstream and 1 Mbps upstream ADSL connection.

Here is an overview of what the rules need to accomplish. See the following sections for more

• SIP traffic from VIP users must get through with the least possible delay regardless of if it is an

outgoing call or an incoming call. The VIP users must be able to make and receive SIP calls no

matter which interface they are connected to.

• HTTP traffic needs to be given priority over FTP traffic.

• FTP traffic from the WAN to the DMZ must be limited so it does not interfere with SIP and HTTP

ISG50 User's Guide

CONFIGURED RATE

for an example of how to set up web surfing policies with bandwidth

for a description of DSCP marking.

Chapter 25 Bandwidth Management