Chapter 25 Bandwidth Management

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 126 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 DSCP Marking and Per-Hop Behavior on page 189 for a description of DSCP marking.

25.2The Bandwidth Management Screen

The Bandwidth management screens control the bandwidth allocation for TCP and UDP traffic. You can use source interface, destination interface, destination port, schedule, user, source, destination information, DSCP code and service type as criteria to create a sequence of specific conditions, similar to the sequence of rules used by firewalls, to specify how the ZyWALL handles the DSCP value and allocate bandwidth for the matching packets.

Click Configuration > BWM to open the following screen. This screen allows you to enable/disable bandwidth management and add, edit, and remove user-defined bandwidth management policies.

The default bandwidth management policy is the one with the priority of “default”. It is the last policy the ZyWALL checks if traffic does not match any other bandwidth management policies you have configured. You cannot remove, activate, deactivate or move the default bandwidth management policy.

Figure 232 Configuration > Bandwidth Management

 

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