QoS and QoS Policies
128
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
Network ingress and egress QoS policies are applied to network interfaces. On
ingress for traffic received from the network, the policy maps incoming EXP values
to forwarding classes and profile states. On egress, the policy maps forwarding
classes and profile states to EXP values for traffic to be transmitted into the network.
On the network side, there are two types of QoS policies: network and network queue
(see Table 18). The network type of QoS policy is applied to the network interface
under the config>router>interface command and contains the EXP marking rules
for both ingress and egress. The network queue type of QoS policy defines all of the
internal settings; that is, how the queues, or sets of queues (for ingress), are set up
and used per physical port on egress and per adapter card for ingress.
A ring type network policy can be applied to the ring ports and the add/drop port on
a ring adapter card. The policy is created under the config>qos>network command,
and applied at the adapter card level under the config>card>mda command. The
policy maps each dot1p value to a queue and a profile state.
If GRE or IP tunneling is enabled, policy mapping can be set up to use DSCP bits.
Network queue policies are applied on egress to network ports and channels and on
ingress to adapter cards. The policies define the forwarding class queue
characteristics for these entities.
Service ingress, service egress, and network QoS policies are defined with a scope
of either template or exclusive. Template policies can be applied to multiple SAPs or
interfaces, whereas exclusive policies can only be applied to a single entity.
One service ingress QoS policy and one service egress QoS policy can be applied
to a specific SAP. One network QoS policy can be applied to a specific interface. A
network QoS policy defines both ingress and egress behavior. If no QoS policy is
explicitly applied to a SAP or network interface, a default QoS policy is applied.
Table 18 provides a summary of the major functions performed by the QoS policies.
Table 18 QoS Policy Types and Descriptions
Policy Type Applied at… Description Section
Service
Ingress
SAP ingress Defines up to eight forwarding class queues and queue
parameters for traffic classification
Defines match criteria to map flows to the queues based on
combinations of customer QoS (dot1p bits and DSCP
values)
Service
Ingress QoS
Policies
Service
Egress
SAP egress Defines up to eight forwarding class queues and queue
parameters for traffic classification
Maps one or more forwarding classes to the queues
Service Egress
QoS Policies
To Next Page
Loading...
