Deployment Guide

55 Dell EMC Solutions for Microsoft Azure Stack HCI Networking Guide
11 Switch DCB validation commands
If DCB is used, the commands in this section will help verify DCB is configured correctly. The commands and
output shown are for S5248F-Leaf1A. The output of its peer, S5248F-Leaf1B, is similar.
11.1 Show queuing statistics
Queuing statistics can be viewed to verify that traffic is applied to the correct queues and that storage and
cluster heartbeat traffic (queues 3 and 5 respectively) is not dropped under heavy network loads.
S5248F-Leaf1A# show queuing statistics interface ethernet 1/1/1
Interface ethernet1/1/1
Queue Packets Bytes Dropped-Packets Dropped-Bytes
0 32082748 89906196746 17774345 26742951754
1 0 0 0 0
2 0 0 0 0
3 21947244 90065497612 0 0
4 0 0 0 0
5 1567 655233 0 0
6 0 0 0 0
7 0 0 0 0
Note: The Dropped-Packets and Dropped-Bytes for LAN traffic (CoS 0/Queue 0) shown in the output
above are the results of sending an overwhelming amount of LAN traffic over the physical storage links with
an IXIA traffic generator. This was done to verify DCB was configured correctly and that no storage or cluster
heartbeat traffic was dropped.
11.2 Show interface priority flow control
This command shows the count of PFC pause frames received and transmitted on each interface. Pause
frames are sent under heavy loads to ensure frames are not dropped. In this example, pause frames were
received from the host interface for CoS 3 and 5 traffic.
S5248F-Leaf1A# show interface ethernet 1/1/1 priority-flow-control details
ethernet1/1/1
Admin Mode : true
Operstatus: true
PFC Priorities: 3,5
Total Rx PFC Frames: 574
Total Tx PFC frames: 20
Cos Rx Tx
---------------------------------------
0 0 0
1 0 0
2 0 0
3 287 20
4 0 0
5 287 0
6 0 0
7 0 0