Pfc Configuration Example - Lenovo Flex System Fabric CN4093 Application Manual

PFC Configuration Example

1. Turn CEE on.
2. Enable PFC for the FCoE traffic.
314
CN4093 Application Guide for N/OS 8.4
Note: DCBX may be configured to permit sharing or learning PFC configuration
with or from external devices. This example assumes that PFC configuration is
being performed manually. See "Data Center Bridging Capability Exchange" on
page 322 for more information on DCBX.
This example is consistent with the network shown in Figure 32 on page
this example, the following topology is used.
Table 29.
Port‐Based PFC Configuration
Switch 802.1p
Port Priority
EXT1 0‐2
3
4
others
EXT22 3
INTA1 3
others
INTA2 0‐2
3
4
others
In this example, PFC is to facilitate lossless traffic handling for FCoE (priority
value 3) and a business‐critical LAN application (priority value 4).
Assuming that CEE is off (the CN4093 default), the example topology shown in
Table 29 on page 314 can be configured using the following commands:
CN 4093(config)# cee enable
Note: Turning CEE on will automatically change some 802.1p QoS and 802.3x
standard flow control settings and menus (see "Turning CEE On or Off" on
page 302).
Note: PFC is enabled on priority 3 by default. If using the defaults, the manual
configuration commands shown in this step are not necessary.
CN 4093(config)# cee port INTA1 pfc priority 3 enable (FCoE priority)
CN 4093(config)# cee port INTA1 pfc priority 3 description "FCoE" (Optional)
CN 4093(config)# cee port EXT22 pfc priority 3 enable (FCoE priority)
CN 4093(config)# cee port EXT22 pfc priority 3 description "FCoE" (Optional)
Usage
LAN
(not used)
Business‐critical LAN
(not used)
Fiber Channel network
FCoE
(not used)
LAN
(not used)
Business‐critical LAN
(not used)
300. In
PFC
Setting
Disabled
Enabled
Enabled
Disabled
Enabled
Enabled
Disabled
Disabled
Enabled
Enabled
Disabled