Chapter 28 Application Patrol

So server A gets its configured rate of 300 kbps plus 250 kbps for a total of 550 kbps. Server B gets its configured rate of 200 kbps plus 250 kbps for a total of 450 kbps.

Table 127 Maximize Bandwidth Usage Effect

POLICY

CONFIGURED RATE

MAX. B. U.

PRIORITY

ACTUAL RATE

A

300 kbps

Yes

1

550 kbps

 

 

 

 

 

B

200 kbps

Yes

2

450 kbps

 

 

 

 

 

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 ZyWALL 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 128 Priority and Over Allotment of Bandwidth Effect

POLICY

CONFIGURED RATE

MAX. B. U.

PRIORITY

ACTUAL RATE

A

1000 kbps

Yes

1

999 kbps

 

 

 

 

 

B

1000 kbps

Yes

2

1 kbps

 

 

 

 

 

Finding Out More

•See Section 6.5.17 on page 102 for related information on these screens.

•See Section 7.5 on page 122 for an example of how to set up web surfing policies with bandwidth restrictions.

•See DSCP Marking and Per-Hop Behavior on page 283 for a description of DSCP marking.

28.1.3Application Patrol 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. The following sections give some simplified examples of using application patrol policies to manage applications competing for that 1 Mbps of upstream bandwidth.

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

•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.

 

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