H3C Technologies H3C S7500E Series Switches - Manual (Page 97)

13-8
Sending buffer size of the OLT port
For traffic to be sent out an OLT port, you can set the priority threshold to identify high-priority traffic
and low-priority traffic. You can set sending buffer to reserve buffer for high-priority queues and thus
decrease the dropping probability of high-priority packets and guarantee QoS for high-priority packet
transmission. The sending buffer does not apply to low-priority queues.
You need to set the buffer parameters for high-priority packets in OLT port view and then enable
high-priority packet buffering for the specified ONU in ONU port view. After the configurations, when
the OLT sends traffic to the specified ONU, high-priority packet buffering is enabled and so that
high-priority packets can be sent preferentially.
You can enable high-priority packet buffering for multiple ONUs, and the OLT will reserve an
independent buffer for each ONU.
Follow these steps to configure rate limiting:
To do… Use the command… Remarks
Enter system view system-view —
Enter OLT port view interface interface-type interface-number —
Configure the priority threshold
and enable high-priority packet
buffering
bandwidth downstream priority-queue priority
high-priority-reserved value
Required
The downlink packets
on an OLT port are
considered
high-priority only if
their priority is greater
then or equal to the
priority value.
The value argument
is in bytes.
By default, no buffer
is reserved for
high-priority packets.
Return to system view quit —
Enter ONU port view interface interface-type interface-number —
Reserve high-priority buffer for
the current ONU
bandwidth downstream high-priority enable
Optional
By default, the OLT
reserves no
high-priority buffer for
an ONU.