•
Enter the
system jumbomtu
command to define the upper bound of any MTU in the system. The system
jumbo MTU has a default value of 9216 bytes. The minimum MTU is 2158 bytes and the maximum
MTU is 9216 bytes.
•
The system class MTU sets the MTU for all packets in the class. The system class MTU cannot be
configured larger than the global jumbo MTU.
•
The FCoE system class (for Fibre Channel and FCoE traffic) has a default MTU of 2158 bytes. This
value cannot be modified.
•
The switch sends the MTU configuration to network adapters that support DCBX.
MTU is not supported in Converged Enhanced Ethernet (CEE) mode for DCBX.
Note
Configuring System QoS
Attaching the System Service Policy
The
service-policy
command specifies the system class policy map as the service policy for the system.
Procedure
Purpose
Command or Action
Enters global configuration mode.
switch#
configure terminal
Step 1
Enters system class configuration mode.
switch(config)#
system qos
Step 2
Specifies the policy map to use as the service policy for the system.
There are three policy-map configuration modes:
switch(config-sys-qos)#
service-policy type
Step 3
{
network-qos
|
qos
|
queuing
}
[
input
|
output
]
policy-name
•
network-qos
—
Network-wide (system qos) mode.
•
qos
—
Classification mode (system qos input or interface input
only).
•
queuing
—
Queuing mode (input and output at system qos and
interface).
There is no default policy-map configuration mode; you
must specify the
type
. The
input
keyword specifies that
this policy map should be applied to traffic received on an
interface. The
output
keyword specifies that this
policy-map should be applied to traffic transmitted from
an interface. You can only apply
input
to a qos policy;
you can apply both
input
and
output
to a queuing policy.
Note
Cisco Nexus 5000 NX-OS Quality of Service Configuration Guide, Release 5.1(3)N2(1)
OL-26657-01
37
Configuring QoS on the System
Configuring System QoS
