Administrator Guide

Example of rate—shape Command
Dell#config
Dell(conf)#interface tengigabitethernet 1/0
Dell(conf-if)#rate shape 500 50
Dell(conf-if)#end
Dell#
Guidelines for Configuring ECN for
Classifying and Color-Marking Packets
Keep the following points in mind while configuring the marking and mapping of incoming packets using
ECN fields in IPv4 headers:
• Currently Dell Networking OS supports matching only the following TCP flags:
• ACK
• FIN
• SYN
• PSH
• RST
• URG
In the existing software, ECE/CWR TCP flag qualifiers are not supported.
• Because this functionality forcibly marks all the packets matching the specific match criteria as ‘yellow’,
Dell Networking OS does not support Policer based coloring and this feature concurrently.
• If single rate two color policer is configured along with this feature, then by default all packets less than
PIR would be considered as “Green” But ‘Green’ packets matching the specific match criteria for which
‘color-marking’ is configured will be over-written and marked as “Yellow”.
• If two rate three color policer is configured along with this feature then,
• x < CIR – will be marked as “Green”
• CIR < x< PIR – will be marked as “Yellow”
• PIR < x – will be marked as “Red”
But ‘Green’ packets matching the specific match criteria for which ‘color-marking’ is configured will be over-
written and marked as “Yellow”.
Quality of Service (QoS) 727