Using WRED on S4048-ON

Question

I wanted to test out WRED capabilities on Dell S4048-ON to just see how it would drop packets based on DSCP markings, however, I found it difficult to trigger. In my opinion, dell manual is a little light on their explanation of WRED configuration. I have tried marking all packets coming from one port with DSCP value of 46 (which I would mark as red with color map) and then set output policy on outgoing port with wred precedence policy in hopes to see them dropped. Once the outgoing port is flooded no packets are dropped even though I see in packet capture that they are marked correctly. Maybe some hint at something I might be missing?   Conf:   ip access-list standard allow_allseq 5 permit any!class-map match-any all_classseq 30 match ip access-group allow_all set-color yellow!policy-map-input voip_in_policyservice-queue 0 class-map all_class qos-policy voip_qos_policy!policy-map-output outputmapservice-queue 0 qos-policy outputpolice!qos-policy-input voip_qos_policyset ip-dscp 46!qos-policy-output outputpolicewred yellow wred_drop!qos dscp-color-map my-colorsdscp yellow 0-39dscp red 40-63! Input policy port: interface TenGigabitEthernet 1/47no ip addressportmode hybridswitchportservice-policy input voip_in_policyno shutdown Output port: interface TenGigabitEthernet 1/31no ip addressportmode hybridswitchportservice-policy output outputpoliceno shutdownqos dscp-color-policy my-colors

DELL-Josh Cr · Answer

Hi, What does show qos statistics wred-profile Show?

AndriusLi · Answer

Shows no packets caught, I believe I am just missing some obvious point. I made sure to flood the line to the max.

Wred State : Enabled

Interface Te 1/31
Drop-statistic Dropped Pkts
Green 0
Yellow 0
Out of Profile 0

At least the input policy is working which marks the packets with dscp value (seen in statistics and wireshark).

#show qos statistics
Interface Te 1/31
Queue# Matched Pkts
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
Interface Te 1/47
Queue# Matched Pkts
0 66095110
1 0
2 0
3 0
4 0
5 0
6 0
7 0

DELL-Josh Cr · Answer

Which OS version are you using?

Networking General

Was this post helpful?