Reference Guide

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 (This internal table has been
modified for Z9500 platform) .
Table 10.
Internal-
priority
0 1 2 3 4 5 6 7
Queue 1 2 0 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.
Dell(conf-if-te-1/1)#pfc priority 1,2
DCBx Example
The following figure shows how to use DCBx.
The external 40GbE 40GbE ports on the base module (ports 33 and 37) of two switches are used for uplinks configured as
DCBx auto-upstream ports. The device is connected to third-party, top-of-rack (ToR) switches through 40GbE uplinks. The
ToR switches are part of a Fibre Channel storage network.
The internal ports (ports 1-32) connected to the 10GbE backplane are configured as auto-downstream ports.
220
Data Center Bridging (DCB)