C H A P T E R
7
Configuring QoS on Interfaces
This chapter contains the following sections:
•
Information About Interface QoS, page 43
•
Configuring Interface QoS, page 45
•
Verifying the Interface QoS Configuration, page 47
Information About Interface QoS
Trust Boundaries
The trust boundary is enforced by the incoming interface as follows:
•
All Fibre Channel and virtual Fibre Channel interfaces are automatically classified into the FCoE system
class.
•
By default, all Ethernet interfaces are trusted interfaces.The 802.1p CoS and DSCP are preserved unless
the marking is configured. There is no default CoS to queue and DSCP to queue mapping. You can
define and apply a policy to create these mappings. By default, without a user defined policy, all traffic
is assigned to the default queue.
•
Any packet that is not tagged with an 802.1p CoS value is classified into the default drop system class.
If the untagged packet is sent over a trunk, it is tagged with the default untagged CoS value, which is
zero.
•
You can override the default untagged CoS value for an Ethernet interface or port channel.
•
You can override the default untagged CoS value for an Ethernet interface or a port channel interface
using the
untagged cos cos-value
command.
After the system applies the untagged CoS value, QoS functions the same as for a packet that entered the
system tagged with the CoS value.
Cisco Nexus 5000 NX-OS Quality of Service Configuration Guide, Release 5.1(3)N2(1)
OL-26657-01
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