Users Guide

Configuration Example for DSCP and PFC Priorities
Consider a scenario in which the following DSCP and PFC priorities are necessary:
DSCP 0 – 5, 10 - 15 20 – 25, 30 – 35
Expected PFC
Priority
1 2
To configure the aforementioned DSCP and PFC priority values, perform the following tasks:
1 Create class-maps to group the DSCP subsets
class-map match-any dscp-pfc-1
match ip dscp 0-5,10-15
!
class-map match-any dscp-pfc-2
match ip dscp 20-25,30-35
2 Associate above class-maps to Queues Queue assignment to be based on the below table.
Table 18. o Queues Queue Assignment
Internal-
priority
0 1 2 3 4 5 6 7
Queue 1 0 2 3 4 5 6 7
3 Dot1p->Queue Mapping Configuration is retained at the default value.
Default dot1p-queue mapping is,
Dell#show qos dot1p-queue-mapping
Dot1p Priority : 0 1 2 3 4 5 6 7
Queue :2 0 1 3 4 5 6 7
4 Interface Configurations on server connected ports.
a Enable DCB globally.
Dell(conf)#dcb enable
b Apply PFC Priority configuration. Configure priorities on which PFC is enabled.
DCBx Example
The following figure shows how to use DCBx.
The device is connected to third-party, top-of-rack (ToR) switches through 40GbE or 10GBE uplinks. The ToR switches are part of a Fibre
Channel storage network. The ports connected to the server with CNA are configured as auto-downstream ports.
272
Data Center Bridging (DCB)