Samsung Ubigate iBG2016 Configuration Manual page 228

CHAPTER 10. QoS
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.
Therefore it is sufficient for the token filler to execute every 1 second and fill
CBS number of tokens into the Tc bucket and PBS number of tokens into the
Tp bucket. However, in our implementation the token filler will run every 100
ms. Note that the same token-filling process will replenish tokens in all
srTCM and trTCM token buckets.
192
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 10.6 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