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Firewall Settings > BWM
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SonicOS 5.8.1 Administrator Guide
Guaranteed Bandwidth: A declared percentage of the total available bandwidth on an
interface which will always be granted to a certain class of traffic. Applicable to both inbound
and outbound BWM. The total Guaranteed Bandwidth across all BWM rules cannot exceed
100% of the total available bandwidth. SonicOS Enhanced 5.0 and higher enhances the
Bandwidth Management feature to provide rate limiting functionality. You can now create traffic
policies that specify maximum rates for Layer 2, 3, or 4 network traffic. This enables bandwidth
management in cases where the primary WAN link fails over to a secondary connection that
cannot handle as much traffic. The Guaranteed Bandwidth can also be set to 0%.
Inbound (Ingress) BWM: The ability to shape the rate at which traffic enters a particular
interface. For TCP traffic, actual shaping can occur where the rate of the ingress flow can be
adjusted by delaying egress acknowledgements (ACKs) causing the sender to slow its rate. For
UDP traffic, a discard mechanism is used since UDP has no native feedback controls.
Maximum Bandwidth: A declared percentage of the total available bandwidth on an interface
defining the maximum bandwidth to be allowed to a certain class of traffic. Applicable to both
inbound and outbound BWM. Used as a throttling mechanism to specify a bandwidth rate limit.
The Bandwidth Management feature is enhanced to provide rate limiting functionality. You can
now create traffic policies that specify maximum rates for Layer 2, 3, or 4 network traffic. This
enables bandwidth management in cases where the primary WAN link fails over to a secondary
connection that cannot handle as much traffic.The Maximum Bandwidth can be set to 0%,
which will prevent all traffic.
Outbound (Egress) BWM: Conditioning the rate at which traffic is sent out an interface.
Outbound BWM uses a credit (or token) based queuing system with 8 priority rings to service
different types of traffic, as classified by Access Rules.
Priority: An additional dimension used in the classification of traffic. SonicOS uses eight
priority values (0 = highest, 7 = lowest) to comprise the queue structure used for BWM. Queues
are serviced in the order of their priority.
Queuing: To effectively make use of the available bandwidth on a link. Queues are commonly
employed to sort and separately manage traffic after it has been classified.