QoS Policies
Quality of Service Guide 53
Note:
1. When a SNAP header is present, the LLC header is always set to AA-AA
Service ingress QoS policy ID 1 is reserved for the default service ingress policy. The default
policy cannot be deleted or changed.
The default service ingress policy is implicitly applied to all SAPs which do not explicitly
have another service ingress policy assigned. The characteristics of the default policy are
listed in Table 12.
Egress Forwarding Class Override
Egress forwarding class override provides additional QoS flexibility by allowing the use of a
different forwarding class at egress than was used at ingress.
The ingress QoS processing classifies traffic into a forwarding class (or sub-class) and by
default the same forwarding class is used for this traffic at the access or network egress. The
ingress forwarding class or sub-class can be overridden so that the traffic uses a different
forwarding class at the egress. This can be configured for the main forwarding classes and for
sub-classes, allowing each to use a different forwarding class at the egress.
Table 12: Default Service Ingress Policy ID 1 Definition
Characteristic Item Definition
Queues Queue 1 1 (one) queue all unicast traffic:
• Forward Class: best-effort (be)
•CIR = 0
• PIR = max (line rate)
• MBS, CBS and HP Only = default (values derived from
applicable policy)
Queue 11 1 (one) queue for all multipoint traffic:
•CIR = 0
• PIR = max (line rate)
• MBS, CBS and HP Only = default (values derived from
applicable policy)
Flows Default Forwarding
Class
1 (one) flow defined for all traffic:
• All traffic mapped to best-effort (be) with a low priority
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