Samsung Ubigate iBG3026 Configuration Manual page 222

CHAPTER 19. QoS
In the color aware mode, packet is assumed to be pre-colored. In this case
when packet of size B bytes arrives for policing, if Tp(t)-B < 0 and packet
color is green or yellow, then the packet marked red else if Tc(t)-B < 0 and
packet color green then the packet marked yellow and Tp is decremented by B
else packet's color is unchanged and both Tc and Tp are decremented by B.
Token Replenish
Process Fill tokens
at rate = CIR
Executes every 100ms
Token Bucket(Tc)
Size = CBS
Packet arrival
Packet
classification
The CIR and PIR will be specified in Kbps. CBS and PBS will be specified in
Kbits. CBT and PBT are defined by the relationships(CIR = CBS/CBT) and
(PIR = PBS/PBT). The period of the token filling process should at least be
equal to the lesser of CBT and PBT milliseconds. Without which CIR and PIR
cannot be sustained. It is recommended that CBS and PBS be large enough so
that CBT and PBT are at least 1 second.
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Yes
Is Tc full?
Drop
No
Tc
tokens
Insufficient
Get
tokens
'pkt size' number
of tokens
Green packet
Green action
Permit/mark-dscp/
drop
Packets sent for further processing
Figure 19.6 Two Rate Three Color Marking
Yes
Is Tc full?
No
Tp
tokens
Get
'pkt size' number
of tokens
Yellow packet
Yellow action
Permit/mark-dscp/
drop
© SAMSUNG Electronics Co., Ltd.
Yes
Token Replenish
Process Fill tokens
at rate = PIR
Executes every 100ms
(PIR >= CIR)
Token Bucket(Tp)
Size = PBS
(PBS >= CBS)
Out-of profile
packet
Red packet
Red action
Permit/mark-dscp/
drop