Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
300
of
473
PSFP
This page lets you view and set current PSFP flow meter parameters.
Per-Stream Filtering and Policing (PSFP) improves network robustness by filtering individual traffic streams.
PSFP prevents traffic overload conditions that may affect bridges and the receiving endpoints due to
malfunction or Denial of Service (DoS) attacks. The stream filter uses rule matching to allow frames with
specified stream IDs and priority levels and apply policy actions otherwise. All streams are coordinated at their
gates, similar to 802.1Qch signaling. Flow metering applies predefined bandwidth profiles for each stream.
See
or the
Figure 18-1.4: PSFP Flow Meter Configuration
Parameter descriptions
:
Delete
: Check to delete the entry. It will be deleted during the next save.
FMI ID
: The
FlowMeterInstance
parameter is an index into the PSPF Flow Meter Configuration table.
CIR
: The
FlowMeterCIR
parameter contains an integer value that represents the CIR value for the flow meter, in
bits/second. Committed Ingress Rate (CIR) sets the average maximum bandwidth allowed to be sent on the
egress interface, measured in bits per second.
CBS
: The
FlowMeterCBS
parameter contains an integer value that represents the CBS value for the flow meter,
in octets. Committed Burst Shape (CBS) is the burst of data allowed to be sent even though it is above the CIR.
This is defined in number of bytes of data.
EIR
: Excess Information Rate is the average rate (in bytes per unit of time), in excess of the CIR, up to which the
network may transfer frames without any performance objectives.
EBS
: (Excess Burst Size) defines a limit on the maximum number of information units (e.g., bytes) available for a
burst of frames sent at the interface speed to remain EIR-conformant.
CF
: Coupling flag (CF) allows the choice between two modes of operation of the rate enforcement algorithm.
CM
: Color mode (CM) indicates whether the "color-aware" or "color-blind" property is employed by the
bandwidth profile.
Color Aware
: Algorithm considers the color indication of incoming frames. Incoming frames without a
color indication get a default color prior to entering the meter. Frames are never “promoted”; an
incoming yellow frame is never changed to green.
Color Blind
: Algorithm ignores the color indication (if any) of incoming frames. Effectively all incoming
frames are assumed to start out green.
Drop On Yellow
: Drop on Yellow (Excess) frames
.
