Cisco Nexus 2000 Series Manual page 14

FEX Queuing Support
• Hardware Queue-limit Support
The following example shows how to configure the queue limit for a FEX by using the hardware
fex-type queue-limit command in the FEX configuration mode:
switch(config)# fex 101
switch(config-fex)# hardware ?
B22HP Fabric Extender 16x10G SFP+ 8x10G SFP+ Module
N2224TP Fabric Extender 24x1G 2x10G SFP+ Module
N2232P Fabric Extender 32x10G SFP+ 8x10G SFP+ Module
N2232TM Fabric Extender 32x10GBase-T 8x10G SFP+ Module
N2232TM-E Fabric Extender 32x10GBase-T 8x10G SFP+ Module
N2248T Fabric Extender 48x1G 4x10G SFP+ Module
N2248TP-E Fabric Extender 48x1G 4x10G SFP+ Module
switch(config-fex)# hardware N2248T ?
queue-limit Set queue-limit
switch(config-fex)# hardware N2248T queue-limit ?
<5120-652800> Queue limit in bytes ======> Allowed range of values varies dependent
on the FEX type for which it is configured
switch(config-fex)# hardware N2248T queue-limit ======> Default configuration that sets
queue-limit to default value of 66560 bytes
switch(config-fex)# hardware N2248T queue-limit 5120 ======> Set user defined queue-limit
for FEX type N2248T associated on fex id 101
switch(config-fex)# no hardware N2248T queue-limit ======> Disable queue-limit for FEX
type N2248T associated on fex id 101
switch(config-fex)# hardware N2248TP-E queue-limit ?
<32768-33538048> Queue limit in Bytes
rx Ingress direction
tx Egress direction
switch(config-fex)# hardware N2248TP-E queue-limit 40000 rx
switch(config-fex)# hardware N2248TP-E queue-limit 80000 tx ======> For some FEX types,
different queue-limit can be configured on ingress & egress directions
The value of the queue limit that is displayed for a FEX interface is 0 bytes until after the first time the
FEX interface is brought up. After the interface comes up, the output includes the default queue limit
or the user-defined queue limit based on the hardware queue-limit configuration. If the hardware queue
limit is unconfigured, "Queue limit: Disabled" is displayed in the command output. The following partial
output of the show queuing interface interface command shows the queue limit that is enforced on a
FEX:
switch# show queuing interface ethernet 101/1/48
<snippet>
Queue limit: 66560 bytes
<snippet>
• Global Enable/Disable Control of DSCP2Q
In the following example, the all or the f-series keyword enables DSCP2q mapping for the FEX host
interfaces, regardless of the module type to which the FEX is connected:
switch(config)# hardware QoS dscp-to-queue ingress module-type ?
all
f-series
m-series
• Show Command Support for FEX Host Interfaces
The show queuing interface interface command is supported for FEX host interfaces. The following
sample output of this command for FEX host interfaces includes the number of queues used, the mapping
for each queue, the corresponding queue MTU, the enforced hardware queue limit, and the ingress and
egress queue statistics.
Cisco Nexus 2000 Series NX-OS Fabric Extender Software Configuration Guide for Cisco Nexus 7000 Series
Switches, Release 5.2
14
◦ Such parameters as the bandwidth, queue limit, priority, and set CoS in the network-QoS type
queuing-policy maps are not supported for a FEX.
Enable dscp based queuing for all cards
Enable dscp based queuing for f-series cards
Enable dscp based queuing for m-series cards
Overview