Dell S4048T User Manual

Applying a WRED Profile to Traffic
After you create a WRED profile, you must specify to which traffic Dell Networking OS should apply the
profile.
Dell Networking OS assigns a color (also called drop precedence) — red, yellow, or green — to each packet
based on it DSCP value before queuing it.
DSCP is a 6–bit field. Dell Networking uses the first three bits (LSB) of this field (DP) to determine the drop
precedence.
• DP values of 110 and 100, 101 map to yellow; all other values map to green.
• If you do not configure Dell Networking OS to honor DSCP values on ingress (refer to
Honoring DSCP Values on Ingress Packets), all traffic defaults to green drop precedence.
• Assign a WRED profile to either yellow or green traffic.
QOS-POLICY-OUT mode
wred
Displaying Default and Configured WRED
Profiles
To display the default and configured WRED profiles, use the following command.
• Display default and configured WRED profiles and their threshold values.
EXEC mode
show qos wred-profile
Displaying WRED Profiles
Example of the show qos wred-profile Command.
Dell#show qos wred-profile
Wred-profile-name min-threshold max-threshold max-drop-rate
wred_drop 0 0 100
wred_teng_y 467 4671 100
wred_teng_g 467 4671 50
wred_fortyg_y 467 4671 50
wred_fortyg_g 467 4671 25
Displaying WRED Drop Statistics
To display WRED drop statistics, use the following command.
• Display the number of packets Dell Networking OS the WRED profile drops.
EXEC Privilege mode
show qos statistics wred-profile
Quality of Service (QoS) 854

Dell S4048T Specifications

General

Switching Capacity	1.44 Tbps
Rack Units	1U
Form Factor	Rack-mountable
Power Device	Internal power supply
Power Redundancy	Optional
Product Type	Switch
Jumbo Frame Support	Yes
Routing Protocol	OSPF, BGP, RIP, VRRP, PIM-SM, IGMP
Remote Management Protocol	SNMP, RMON, Telnet, SSH
Features	Quality of Service (QoS), Jumbo Frames Support, Virtual Route Redundancy Protocol (VRRP), VLAN support, sFlow, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), IPv6 support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3ae
Dimensions (W x D x H)	17.3 in x 16 in x 1.7 in
Operating Temperature	0°C to 40 °C
Operating Humidity	10% to 90% (non-condensing)