CHAPTER 10. QoS
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Ingress and egress QoS for IP tunnels
The QoS configuration for IP tunnels is the same as for regular PPP bundles
except CBQ queuing and shaping feature. QoS for IP tunnels provides
policing, and monitoring on both directions.
Hardware QoS
This section describes the QoS features implemented in hardware. In this
release, QoS hardware features are provided by the Marvel chip set.
Hardware-based traffic classification uses the following two look-up tables:
y
Policy PCL profile table
y
Policy Profile(default)
The policy PCL profile is an ordered list of rules in policy profile. Each rule is
compared from start of the profile rule list to end of the profile rule list until
one of the rule matches. So it is a sequential search. After matching rule is
found, the matching process terminates and corresponding action is attempted.
If IP flow classification look-up fails then policy profile default table is used.
For handling congestion on egress queues, the hardware supports three levels
of drop precedence(DP). When congestion occurs on an egress queue, packets
with higher DP can be configured to be dropped, while packets with low DP
are enqueued.
CoS Attributes Marking
CoS attributed are a set of attributes associated with any packet processed by
the Marvel sub-system. These attributes are the Traffic Class(TC), Drop
Precedence(DP), User Priority(UP) and DSCP. They are primarily used to at
different stages of the packet processing to decide the appropriate QoS
treatment to be given to a packet. CoS attributes can be assigned to a packet
by any of the multiple stages of the ingress pipeline.
Summary of Contents for Ubigate iBG2016
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