Configuring Grant Filtering On The Olt Port - 3Com S7906E Configuration Manual

To do...
Configure the related
parameters of ONU discovery
Return to system view
Enter ONU port view
Set the ONU's uplink bandwidth
limits and the delay mode of
packet forwarding.
Configure the
Configure
number of queue
the
sets supported by
administrati
ONU Report
on
frames
attributes of
Configure the
DBA
threshold for a
negotiation
queue
1 time quantum (TQ) is equal to 16 ns, which is the time it takes to transmit two bytes of data at 1
Gbps.
You can manually load an external DBA algorithm file by using the dba-algorithm update
command as needed.
DBA-related configuration is only recommended for administrators. Improper DBA configuration
may terminate all the services.
H3C ONU Report frames support up to two queue sets.
The sum of the minimum uplink bandwidths configured for all created ONU ports under an OLT port
cannot exceeds 921600 kbps, namely, 900 Mbps.

Configuring Grant filtering on the OLT port

In an EPON system, uplink transmission adopts the TDMA technology. An OLT assigns each ONU a
time slot and each ONU can only send data in its own time slot in sequence. Therefore, the OLT
implements strict time synchronization. Within the specified time, the OLT can only receive the packets
from the specified ONU. If the time synchronization of an ONU is inaccurate, however, the packets that
the OLT receives within a specified time period may be from another ONU. In that case, if grant filtering
is enabled on the OLT port, the OLT does not allow the received packets to pass through.
Follow these steps to configure other OLT functions:
Use the command...
dba-parameters
{ discovery-frequency value |
discovery-length value |
cycle-length value } *
quit
interface onu interface-number
upstream-sla
{ minimum-bandwidth value1 |
maximum-bandwidth value2 |
delay { low | high } } *
dba-report queue-set-number
queue-set-number
dba-report queue-id queue-id
{ active | inactive } threshold
threshold-value
2-4
Remarks
Optional
By default, the
discovery-frequency value
is 50, the discovery-length
value is 41500 TQ, and the
cycle-length value is 65535
TQ.
—
—
Required
By default, the minimum
bandwidth of an ONU is 2048
kbps, the maximum
bandwidth is 23552 kbps, and
low delay is adopted.
Optional
By default, ONU Report
messages support two queue
sets. The default thresholds
of queue 4 and queue 5 are
65535, while the default
thresholds of other queues
are 0.