QoS Scheduler Policies
Quality of Service Guide 519
Figure 27: GPON Bandwidth Control through Vport
There are no forward/drop counters directly associated with the EPS. Instead, the counters are
maintained on a per queue level. Consequently, any indication of the congestion level on the
EPS is derived from the queue counters that are associated with the given EPS.
The EPS congestion monitoring capabilities rely on a counter that records the number of
times that the offered EPS load (measured at the queue level) crossed the predefined
bandwidth threshold levels within a given, operator defined timeframe. This counter is called
the exceed counter. The rate comparison calculation (offered rate vs threshold) are executed
several times per second and the calculation interval cannot be influenced externally by the
operator.
The monitoring threshold can be configured via CLI per aggregate EPS rate, EPS level or
EPS group. The threshold is applicable to PIR rates.
To enable congestion monitoring on EPS, monitoring must be explicitly enabled under the
Vport object itself or under the physical port when the EPS is attached directly to the physical
port. In addition, the monitoring threshold within the EPS must be configured.
Two examples of congestion monitoring on an EPS that is configured under the Vport are
shown in Figure 28 and Figure 29. Figure 29 shows more severe congestion than Figure 28.
The EPS exceed counter (the number of dots above the threshold line) can be obtained via a
CLI show command or read directly via MIBs.
al_0740
GPON 1
2.4gbps
2.4gbps
GPONn Vport-n
GPON1 Vport-1
GPON2 Vport-2
2.4gbps
2.4gbps
GPON 2
GPON n
OLT
10G
BNG
•
•
•
10G
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