Allied Telesis AT-8550 - Manual (Page 122)

Traffic Groupings and Creating a QoS Policy
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Permanent MAC addresses. Permanent MAC addresses can be
assigned a QoS profile whenever traffic is destined to the MAC
address. This can be done when you create a permanent FDB entry.
For example:
create fdbentry 00:11:22:33:44:55 vlan default
port 1 qosprofile qp2
Dynamic MAC Addresses. Dynamic MAC addresses can be assigned
a QoS profile whenever traffic is destined to the MAC address. For
any port on which the specified MAC address is learned in the
specified VLAN, the port is assigned the specified QoS profile. For
example:
create fdbentry 00:11:22:33:44:55 vlan default
dynamic qosprofile qp3
The QoS profile is assigned when the MAC address is learned. If the
MAC address entry already exists in the FDB, you can clear the
forwarding database so that the QoS profile can be applied when the
entry is added again. The command to clear the FDB is as follows:
clear fdb
Blackhole. Using the
blackhole option configures the switch not
to forward any packets to the destination MAC address on any ports
for the VLAN specified. The
blackhole option is configured using
the following command:
create fdbentry 00:11:22:33:44:55 vlan default
blackhole
Broadcast/Unknown Rate Limiting. It is possible to assign
broadcast and unknown destination packets to a QoS profile that has
the desired priority and bandwidth parameters. Broadcast/unknown
rate limiting is an extension of the QoS feature used for destination
MAC addresses.
For example, if you want to limit broadcast and unknown traffic on
the VLAN default to the bandwidth and priority defined in QoS
profile qp3, the command is:
create fdbentry ff:ff:ff:ff:ff:ff vlan default
dynamic qp3
Note
IP multicast traffic is subject to broadcast and unknown rate limiting
only when IGMP snooping is disabled.