26
priority bits.
Both 802.1p CoS and DiffServ
: Switch checks both
types.
See notes below for a detailed description.
and DiffServ
Type of Storm Packets:
-
DLF
:
D
estination
L
ookup
F
ailure. The switch wi
ll
always lo
o
k for a desti
n
ation MA
C
address in
its MAC Table first. In case that a MAC address cannot be found in the Table, which means DLF
occurs, the switch will forward the packets to all ports that are in the same LAN.
-
Multicast
: This type of transmission sends messages from one host to multiple hosts. Only
those hosts that belong to a specific multicast group will receive it. Network devices that support
multicast send only one copy of the information across the network until the delivery path that
reaches group members diverges. At these diverging points, multicast packets will be copied and
forwarded; this method can manage high volumes of traffic with different destinations while using
network bandwidth efficiently.
-
Broadcast
: Messages are sent to all devices in the network.
QoS Mode:
-
DWRR
:
D
eficit
W
eighted
R
ound
R
obin. DWRR is the evolved version of WRR and should
provide a fairer priority queue than WRR since it takes the size of the packet into consideration
and add credits to the unprocessed queue for higher priority on the next round. This method
make sure all the traffic queues are serviced, but higher priority queues still retain their
advantage; this mode guarantees that in the event that high-priority traffic exceeds the link
capacity, lower priority traffic will still proceed and not be blocked.
-
Strict
is Strict-Priority Scheduling. The QoS scheduler preempts the highest queue as long as
there are packets. When all the packets are exhausted from the highest queue, the QoS
scheduler reverts back to the weighed fair algorithm to process the remaining queues. This
mode guarantees that traffic in the highest queue always flows first.
By default, the QoS work under the DWRR+Strict mode, which means that for the packets has COS
Q4~Q7 follows strict priority and packets that has COS Q0~Q3 follows DWRR priority and has the
weight below.
-
COS Q0 = 2 packets (DWRR)
-
COS Q1 = 1 packet (DWRR)
-
COS Q2 = 4 packets (DWRR)
-
COS Q3 = 8 packets (DWRR)
-
COS Q4~Q7 work in strict-priority
QoS Type:
-
802.1p CoS:
IEEE standard of layer 2 marking scheme. It specifies a priority value between 0
and 7 that can be used by QoS to differentiate traffic. When this option is enabled, the switch
Содержание EH7506
Страница 35: ...29 Figure 2 40 Mapping Table of DSCP ECN page...
Страница 53: ...47 2 9 1 GVRP Settings Figure 2 62 GVRP setting page...
Страница 55: ...49 2 9 2 GMRP Settings Figure 2 63 GMRP setting page...
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Страница 90: ...84 Figure 2 97 iA Ring Example Topology...
Страница 98: ...92 Management Address Indicates neighbor s management IP address...
Страница 110: ...104 Figure 2 115 Reboot page...
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