D-Link DGS-3426P Product Manual - Page 263

ACL Flow Meter, Access Rule Display window Packet Content

Page 263 highlights

xStack® DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch Figure 5 - 22 Access Rule Display window (Packet Content) NOTE: When using the ACL Mirror function, ensure that the Port Mirroring function is enabled and a target mirror port is set. ACL Flow Meter Before configuring the ACL Flow Meter, here is a list of acronyms and terms users will need to know. trTCM - Two Rate Three Color Marker. This, along with the srTCM, are two methods available on the switch for metering and marking packet flow. The trTCM meters and IP flow and marks it as a color based on the flow's surpassing of two rates, the CIR and the PIR. CIR - Committed Information Rate. Common to both the trTCM and the srTCM, the CIR is measured in bytes of IP packets. IP packet bytes are measured by taking the size of the IP header but not the link specific headers. For the trTCM, the packet flow is marked green if it doesn't exceed the CIR and yellow if it does. The configured rate of the CIR must not exceed that of the PIR. The CIR can also be configured for unexpected packet bursts using the CBS and PBS fields. CBS - Committed Burst Size. Measured in bytes, the CBS is associated with the CIR and is used to identify packets that exceed the normal boundaries of packet size. The CBS should be configured to accept the biggest IP packet that is expected in the IP flow. PIR - Peak Information Rate. This rate is measured in bytes of IP packets. IP packet bytes are measured by taking the size of the IP header but not the link specific headers. If the packet flow exceeds the PIR, that packet flow is marked red. The PIR must be configured to be equal or more than that of the CIR. PBS - Peak Burst Size. Measured in bytes, the PBS is associated with the PIR and is used to identify packets that exceed the normal boundaries of packet size. The PBS should be configured to accept the biggest IP packet that is expected in the IP flow. srTCM - Single Rate Three Color Marker. This, along with the trTCM, are two methods available on the switch for metering and marking packet flow. The srTCM marks its IP packet flow based on the configured CBS and EBS. A packet flow that does not reach the CBS is marked green, if it exceeds the CBS but not the EBS its marked yellow, and if it exceeds the EBS its marked red. CBS - Committed Burst Size. Measured in bytes, the CBS is associated with the CIR and is used to identify packets that exceed the normal boundaries of packet size. The CBS should be configured to accept the biggest IP packet that is expected in the IP flow. EBS - Excess Burst Size. Measured in bytes, the EBS is associated with the CIR and is used to identify packets that exceed the boundaries of the CBS packet size. The EBS is to be configured for an equal or larger rate than the CBS. 254

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xStack
®
DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
254
Figure 5 - 22 Access Rule Display window (Packet Content)
NOTE:
When using the ACL Mirror function, ensure that the Port Mirroring
function is enabled and a target mirror port is set.
ACL Flow Meter
Before configuring the ACL Flow Meter, here is a list of acronyms and terms users will need to know.
trTCM
– Two Rate Three Color Marker. This, along with the srTCM, are two methods available on the switch for metering and
marking packet flow. The trTCM meters and IP flow and marks it as a color based on the flow’s surpassing of two rates, the CIR
and the PIR.
CIR
– Committed Information Rate. Common to both the trTCM and the srTCM, the CIR is measured in bytes of IP
packets. IP packet bytes are measured by taking the size of the IP header but not the link specific headers. For the trTCM,
the packet flow is marked green if it doesn’t exceed the CIR and yellow if it does. The configured rate of the CIR must
not exceed that of the PIR. The CIR can also be configured for unexpected packet bursts using the CBS and PBS fields.
CBS
– Committed Burst Size. Measured in bytes, the CBS is associated with the CIR and is used to identify packets that
exceed the normal boundaries of packet size. The CBS should be configured to accept the biggest IP packet that is
expected in the IP flow.
PIR
– Peak Information Rate. This rate is measured in bytes of IP packets. IP packet bytes are measured by taking the
size of the IP header but not the link specific headers. If the packet flow exceeds the PIR, that packet flow is marked red.
The PIR must be configured to be equal or more than that of the CIR.
PBS
– Peak Burst Size. Measured in bytes, the PBS is associated with the PIR and is used to identify packets that exceed
the normal boundaries of packet size. The PBS should be configured to accept the biggest IP packet that is expected in
the IP flow.
srTCM
– Single Rate Three Color Marker. This, along with the trTCM, are two methods available on the switch for metering and
marking packet flow. The srTCM marks its IP packet flow based on the configured CBS and EBS. A packet flow that does not
reach the CBS is marked green, if it exceeds the CBS but not the EBS its marked yellow, and if it exceeds the EBS its marked red.
CBS
– Committed Burst Size. Measured in bytes, the CBS is associated with the CIR and is used to identify packets that
exceed the normal boundaries of packet size. The CBS should be configured to accept the biggest IP packet that is
expected in the IP flow.
EBS
– Excess Burst Size. Measured in bytes, the EBS is associated with the CIR and is used to identify packets that
exceed the boundaries of the CBS packet size. The EBS is to be configured for an equal or larger rate than the CBS.