3Com 3CDSG8-US User Guide - Page 61

QoS, QoS Configuration, Queue Mode, Strict priority, WRR Weight, Jumbo Frame, Ports > Settings

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Page 61 highlights

QoS 61 11 QOS 11.1 QoS Configuration QoS (Quality of Service) is a mechanism which is used to prioritize certain traffic as it is moves through the switch. Traffic can be classified as High, Medium, Normal or Low priority. This switch features both strict priority-based and weighted round-robin (WRR) forwarding, with guaranteed bandwidth allocation for the different QOS classes. The queueing method can be selected using the Queue Mode drop-down list: • Strict priority - Higher priority frames take precedence over lower priority frames during forwarding. In case of congestion, the lowest priority traffic is dropped before higher priority frames. Head-of-queue blocking maybe encountered by using this mode. • WRR - In this mode, all priorities can be guaranteed a share of the bandwidth when the system is overloaded. The bandwidth sharing percentage can be adjusted by specifying the four QOS class with different ratio in WRR Weight, which appears after WRR is enabled in Queue Mode. Note: WRR is selectable when Jumbo Frame is disabled in Ports > Settings. You can select how traffic is prioritized by using one of the three QoS modes which is selected using the QoS Mode drop-down list: • QoS Disabled - QoS is turned off and all packets have equal priority. • 802.1p - Packets are prioritzed using the content of the VLAN-tag. • DSCP - Packets are prioritized using the DSCP (Differentiated Services Code Point) value.

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QoS
61
11
Q
O
S
11.1
QoS Configuration
QoS (Quality of Service) is a mechanism which is used to prioritize certain traffic as it is moves
through the switch. Traffic can be classified as High, Medium, Normal or Low priority. This
switch features both strict priority-based and weighted round-robin (WRR) forwarding, with
guaranteed bandwidth allocation for the different QOS classes. The queueing method can be
selected using the
Queue Mode
drop-down list:
•
Strict priority
- Higher priority frames take precedence over lower priority frames during
forwarding. In case of congestion, the lowest priority traffic is dropped before higher
priority frames. Head-of-queue blocking maybe encountered by using this mode.
•
WRR
- In this mode, all priorities can be guaranteed a share of the bandwidth when the
system is overloaded. The bandwidth sharing percentage can be adjusted by specifying
the four QOS class with different ratio in
WRR Weight
, which appears after
WRR
is
enabled in
Queue Mode
.
Note:
WRR
is selectable when
Jumbo Frame
is disabled in
Ports > Settings
.
You can select how traffic is prioritized by using one of the three QoS modes which is selected
using the
QoS Mode
drop-down list:
•
QoS Disabled
- QoS is turned off and all packets have equal priority.
•
802.1p
- Packets are prioritzed using the content of the VLAN-tag.
•
DSCP
- Packets are prioritized using the DSCP (Differentiated Services Code Point) value.