Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 131
The enqueuing priority is specified as part of the classification rule and is set to high
or low. The enqueuing priority relates to the forwarding class queue’s
high-priority-only allocation, where only packets with a high enqueuing priority are
accepted into the queue once the queue’s depth reaches the defined threshold. See
High-Priority-Only Buffers.
The mapping of ingress traffic to a forwarding class based on dot1p or DSCP bits is
optional. The default service ingress policy is implicitly applied to all SAPs that do not
explicitly have another service ingress policy assigned. The characteristics of the
default policy are listed in Table 20.
Table 19 Forwarding Class and Enqueuing Priority Classification Hierarchy Based on Rule
Type
Rule Forwarding Class Enqueuing Priority Comments
default-fc Set to the policy’s
default FC.
Set to the policy default All packets match the default
rule
dot1p dot1p-value Set when an fc-name
exists in the policy.
Otherwise, preserve
from the previous
match.
Set when the priority
parameter is high or low.
Otherwise, preserve from the
previous match.
Each dot1p-value must be
explicitly defined. Each packet
can only match a single dot1p
rule. For QinQ applications, the
dot1p-value used (top or
bottom) is specified by the
match-qinq-dot1p command.
dscp dscp-name Set when an fc-name
exists in the policy.
Otherwise, preserve
from the previous
match.
Set when the priority
parameter is high or low in the
entry.
Otherwise, preserve from the
previous match.
Each dscp-name that defines
the DSCP value must be
explicitly defined. Each packet
can only match a single DSCP
rule.
Table 20 Default Service Ingress Policy ID 1 Definition
Characteristic Item Definition
Queues Queue 1 One queue for all ingress traffic:
• Forwarding Class: Best Effort (BE)
•CIR = 0
• PIR = max (line rate)
• MBS = default (180 kilobytes)
• CBS = default (8 kilobytes for 512 byte buffer size, 18 kilobytes
for 2304 byte buffer size)
1
• HP Only = default (10%)
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