Configuring Priority Flow Control And Link-Level Flow Control - Cisco Nexus 5000 Series Configuration Manual

Configuring Priority Flow Control and Link-Level Flow Control

to the egress queue to start observing the tail drop threshold. If the buffer usage is lower than the configured
buffer threshold, the tail drop threshold is ignored.
In Cisco NX-OS Release 4.2(1)N2(1), this command is supported only on the Cisco Nexus 2148T Fabric
Note
Extender.
SUMMARY STEPS
1. switch# configure terminal
2. switch(config)# fex fex-id
3. switch(config-fex)# hardware N2148T buffer-threshold buffer limit
DETAILED STEPS
Command or Action
Step 1
switch# configure terminal
Step 2
switch(config)# fex fex-id
Step 3 switch(config-fex)# hardware N2148T
buffer-threshold buffer limit
This example shows how to restore the default buffer threshold on the Cisco Nexus 2148T Fabric Extender:
switch# configure terminal
switch(config)# fex 101
switch(config-fex)# hardware N2148T buffer-threshold 163840
This example shows how to remove the default buffer threshold on the Cisco Nexus 2148T Fabric Extender:
switch# configure terminal
switch(config)# fex 101
switch(config-fex)# no hardware N2148T buffer-threshold
Configuring Priority Flow Control and Link-Level Flow Control
Cisco Nexus 5000 Series switches support priority flow control (PFC) and Link-Level Flow Control (LLC)
on Ethernet interfaces. The Ethernet interface can operate in two different modes: FCoE mode or standard
Ethernet mode.
If the interface is operating in FCoE mode, the Ethernet link is connected at the server port using a converged
network adapter (CNA).
If the interface is operating in a standard Ethernet mode, the Ethernet link is connected at the server port with
a standard Ethernet network adapter (NIC). The network adapter must support the Data Center Bridging
Exchange protocol (DCBX) for PFC or ingress policing to be supported on the interface.
Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide
42
Purpose
Enters configuration mode.
Specifies the Fabric Extender and enters the Fabric Extender mode.
Configures the buffer threshold for the Cisco Nexus 2148T Fabric
Extender. The buffer threshold is specified in bytes. The range is
from 81920 to 316160 for the Cisco Nexus 2148T Fabric Extender.
Configuring QoS
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