RACOM Ray2, User Manual

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Bucket
rate factor
This is a factor which determines the amount of tokens that need to be decremented
for each rate resource decrement (which is done periodically based on the Com-
mitted Information Rate).
Bucket
increment
Bucket increment (BI) indicates the amount of tokens that need to be added for
each byte of incoming frame.
Account
discarded
frames
This parameter decides whether the ingress rate limiting logic accounts for frames
that have been discarded by the queue controller due to output port queue conges-
tion reasons. To account for all frames coming into a given port associated with
this rate resource, this parameter needs to be set.
Account filtered
frames
This parameter decides whether the ingress rate limiting logic accounts for frames
that have been discarded because of ingress policy violations. To account for all
frames coming into a given port associated with this rate resource, this parameter
needs to be set.
Accounted
bytes
This parameter determines which frame bytes are to be accounted for in the rate
resource's rate limiting calculations.
There are for different supported configurations:
Frame based configures the rate limiting resource to account for
the number of frames from a given port mapped to this rate re-
source. frame
Preamble (8bytes) + Frame’s DA to CRC + IFG (inter frame gap,
12 bytes) layer 1
Frame’s DA to CRC layer 2
Frame’s DA to CRC - 18 - 4(if the frame is tagged) layer 3
A frame is considered tagged if it is either Customer of Provider tagged during in-
gress.
EBS limit action
This parameter controls what kind of action is performed when the EBS limit has
been exceeded. Three types of action can be selected:
The frame that was received on the port will get discarded. drop
In this mode an Ethernet flow control frame gets generated (if the
flow control is enabled for that port) and sent to the source port flow control
but the incoming frame gets passed through the rate resource. If
the port is operating in half-duplex mode then the port gets jammed.
The frame that was received on the port is accepted even though
there are not enough tokens to accept the entire incoming frame. accept
This mode is expected to be selected for TCP based applications.
It is not recommended for media streaming applications where
data timing is critical.
Flow control mode is expected to be programmed on ports that have a trusted flow
control mechanism available. The EBS limit action is a per-port characteristic. If a
port has multiple rate resource buckets then all buckets enabled are expected to
be programmed with the same EBS limit action.
Flow control
de-assertion
This parameter controls the flow control de-assertion when EBS limit action is set
to generate a flow control message. There are two modes available:
Flow control gets de-asserted only when the ingress rate resource
has become empty. empty
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