SonicWALL TZ 180 Manuel d'utilisateur télécharger pdf (Page 490)

Firewall > QoS Mapping

490

SonicOS Enhanced 4.0 Administrator Guide

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Weighted Random Early Detection (WRED) – An implementation of RED that factors

DSCP markings into its discard decision process.

• DSCP – (Differentiate Services Code Points) – The repurposing of the ToS field of an IP

header as described by RFC2747. DSCP uses 64 Code Point values to enable DiffServ

(Differentiated Services). By marking traffic according to its class, each packet can be

treated appropriately at every hop along the network.

• Global Synchronization – A potential side effect of discarding, the congestion avoidance

method designed to deal with full queues. Global Synchronization occurs when multiple

TCP flows through a congested link are dropped at the same time (as can occur in Tail

Drop). When the native TCP slow-start mechanism commences with near simultaneity for

each of these flows, the flows will again flood the link. This leads to cyclical waves of

congestion and under-utilization.

• 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 4.0 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 or IBWM) – 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.

• IntServ – Integrated Services, as defined by RFC1633. An alternative CoS system to

DiffServ, IntServ differs fundamentally from DiffServ in that it has each device request (or

reserve) its network requirements before it sends its traffic. This requires that each hop on

the network be IntServ aware, and it also requires each hop to maintain state information

for every flow. IntServ is not supported by SonicOS. The most common implementation of

IntServ is RSVP.

• 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. SonicOS Enhanced 4.0 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 Maxmimum Bandwidth can be set to 0%, which will prevent all traffic.

• Outbound (Egress or OBWM) – 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 8

priority rings (0 = highest, 7 = lowest) to comprise the queue structure used for BWM.

Queues are serviced in the order of their priority ring.

• Mapping – Mapping, with regard to SonicOS’ implementation of QoS, is the practice of

converting layer 2 CoS tags (802.1p) to layer 3 CoS tags (DSCP) and back again for the

purpose as preserving the 802.1p tags across network links that do not support 802.1p

tagging. The map correspondence is fully user-definable, and the act of mapping is

controlled by Access Rules.

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SonicWALL TZ 180 Manuel d'utilisateur Page 490

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