SonicWALL 5.8.1 Manuale Utente

BWM is controlled by the SonicWALL Security Appliance on ingress and egress traffic. It allows 
network administrators to guarantee minimum bandwidth and prioritize traffic based on access 
rules created in the Firewall > Access Rules page on the SonicWALL management interface. 
By controlling the amount of bandwidth to an application or user, the network administrator can 
prevent a small number of applications or users to consume all available bandwidth. Balancing 
the bandwidth allocated to different network traffic and then assigning priorities to traffic can 
improve network performance. Anti-Spam for UTM provides eight priority queues (0 – 7 or 
Realtime – Lowest). 

Three types of bandwidth management are available:

When BWM is enabled on an interface, all of the traffic to and from that interface is bandwidth 
managed. Let’s consider three examples for each of these three BWM types for an interface 
with a link capacity of 100 Mbps.:

Bandwidth Management type is None – If there are three traffic types (1, 2, and 3) that 
are using the interface, the cumulative capacity for all three types is 100 Mbps. 

Bandwidth Management type is Global – If the available ingress and egress traffic are 
configured to 10 Mbps, the following occurs:

By default, the traffic types are sent to the Medium (4) Priority queue. This queue has, 
by default, a Guaranteed percentage of 50 and a Maximum percentage of 100. 

These values mean that the cumulative link capability is 10 Mbps with no global BWM 
enabled policies configured.

Bandwidth Management type is WAN – By default, the traffic types are sent to a default 
queue created by the system which is at priority 7 which gets 0% guaranteed and 100% 
Maximum. This means that this traffic will get up to 100% of the left over link bandwidth

Because each BWM rule consumes memory for packet queuing, the total number of allowed 
BWM rules is limited to 100 total rules on the appliance.

WAN

Only WAN zones can have assigned guaranteed and maximum bandwidth 
to services and have prioritized traffic.

WAN BWM has eight Priority Queues 0 through 7, with 0 being the 
highest. Queue 7 is Default Priority for all traffic that is not classified by 
a BWM enabled rule\policy.

Global

(Default) All zones can have assigned guaranteed and maximum band-
width to services and have prioritized traffic. When global BWM is enabled 
on an interface, all of the traffic to and from that interface is bandwidth 
managed.
Default Global BWM queues:

2 — High

4 — Medium: Default priority for all traffic that is not managed by a 
BWM enabled Firewall Access rule or Application Control Policy.

6 — Low

None

Disables BWM.