General Port Commands
Page 170 7210 SAS M, T, X, R6, R12, Mxp, S, Sx Interface Configuration Guide
Values 0, 17-61, 175-605]
where: 17-61 is used for 100GHz channels
175, 185 — 605 is used for 50GHz channels
0 only valid on disabled (shutdown) ports
enable-dei
Syntax enable-dei
no enable-dei
Context config>port>ethernet
config>lag
Description This command is used to enable DEI based classification on access ports, network ports, access-uplink or
hybrid ports.
If enabled, DEI value in the Ethernet packet header is used to determine the initial profile/color of the packet
when the meter/policer used to police the FC is configured in color-aware mode. If the meter used to police
the FC is configured in color-blind mode, then the DEI value of the packet has no effect. When in color-
aware mode, DEI value of 0 is interpreted as in-profile or green packet and DEI value of 1 is interpreted as
out-of-profile or yellow packet. In color-aware mode, the following behavior is accorded to packets
classified with intial profile/color as in-profile/green and out-of-profile/yellow:
• If a green packet is received and the color-aware meter is within the CIR rate, then packet is assigned a
final profile of green and it is assigned a final profile of yellow if the meter exceeds the CIR rate and is
within the PIR rate.
• If a yellow packet is received and the color-aware meter is above the CIR rate and within the PIR rate,
then the packet is assigned a final profile of yellow.
In other words, in color-aware mode, yellow/out-of-profile packets cannot eat into the CIR bandwidth. It is
exclusively reserved for green/in-profile packets.
On 7210 SAS-X, the behavior remains the same, when ingress policing is used, but it is different when
ingress queuing is used. When SAP ingress queuing is used, the profile assigned to the packet by user
configuration cannot be reassigned by the ingress meters/policers or by ingress queue rate shapers. Hence
user assigned profile is the final profile assigned to the packet.
The final profile assigned at ingress is used by egress to determine the WRED slope to use. The WRED
slope determines whether the packet is eligible to be assigned a buffer and can be queued up on egress queue
for transmission. On 7210 SAS-X, the behavior remains the same, when ingress policing is used, but it is
different when ingress queuing is used. When SAP ingress queuing is used, the ingress profile is used to
determine the WRED slope to use at ingress (access SAPs), in addition to egress (access SAPs and network/
hybrid port).
NOTE: For more infomation, see the “7210 SAS QoS Configuration User Guide”.
Default no enable-dei
Parameters none
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