DEI:
Controls the default DEI for untagged frames.
Tag Class.:
Shows the classification mode for tagged frames on this port.
Disabled: Use default QoS class and DP level for tagged frames.
Enabled: Use mapped versions of PCP and DEI for tagged frames.
Click on the mode in order to configure the mode and/or mapping.
DSCP Based:
Click to Enable DSCP Based QoS Ingress Port Classification.
Buttons:
Save – Click to save changes.
Reset – Click to undo any changes made locally and revert to previously saved values.
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DP level: Every incoming frame is classified to a Drop Precedence Level (DP level), which is used throughout the
device for providing congestion control guarantees to the frame according to what was configured for that
specific DP level.
PCP: PCP is an acronym for Priority Code Point. It is a 3-bit field storing the priority level for the 802.1Q frame.
DEI: DEI is an acronym for Drop Eligible Indicator. It is a 1-bit field in the VLAN tag.
Actual PCP is Pri column in VLAN tag packet, DEI is cfi column
PCP value from 0~7, it can be used for priority definition.
DEI value is 0 or 1, it is settable; map to DP value is 0 or 1. When ingress QoS class value is the same, the DP
level defines the priority, a large DP value will be dropped first.
ex: From Port 1 input 1G Pkts, Egress Port 7 Rate be set with 500M. Port 1 Pkts will include two kinds of packets:
a. PCP & DEI = 0 0, via configured map to QoS class & DP level = 1, 0
b. PCP & DEI = 0 1, via configured map to QoS class & DP level = 1, 1
Result will find: (a) all packets past, and (b) all packets dropped
3.14.2 Port Policing
This section provides an overview of QoS Ingress Port Polices for all switch ports The Port Policing is useful in constraining
traffic flows and marking frames above specific rates. Policing is primarily useful for data flows and voice or video flows
because voice and video usually maintains a steady rate of traffic
Web Interface
To display the QoS Port Schedulers in the web interface:
1. Click Configuration, QoS, Port Policing
2. Activate which port need to enable the QoS Ingress Port Polices and type the Rate limit condition.
3. Select the Rate limit Unit with kbps, Mbps, fps, or kfps.
4. Click Apply to save the configuration.
Figure 3-14.2: The QoS Ingress Port Policies Configuration (GS-2310P)
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