Chapter 32 Application Patrol

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

Table 136 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 6.5.18 on page 111 for related information on these screens.

•See Section 7.6 on page 133 for an example of how to set up web surfing policies with bandwidth restrictions.

•See DSCP Marking and Per-Hop Behavior on page 349 for a description of DSCP marking.

32.1.3Application 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.

•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 traffic.

 

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