LevelOne FGL-2870 - Manual (Page 593)

Interface Commands
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4
switchport packet-rate
This command configures broadcast, multicast and unknown unicast storm control.
Use the no form to restore the default setting.
Syntax
switchport {broadcast | multicast | unicast} packet-rate rate
no switchport {broadcast | multicast | unicast}
• broadcast - Specifies storm control for broadcast traffic.
• multicast - Specifies storm control for multicast traffic.
• unicast - Specifies storm control for unknown unicast traffic.
• rate - Threshold level as a rate; i.e., kilobits per second.
(Range: 64-100000 for 100 Mbps ports, 64-1000000 for 1 Gbps ports)
Default Setting
Broadcast Storm Control: Enabled, packet-rate limit: 64 kbps
Multicast Storm Control: Disabled
Unknown Unicast Storm Control: Disabled
Command Mode
Interface Configuration (Ethernet)
Command Usage
• When traffic exceeds the threshold specified for broadcast and multicast or
unknown unicast traffic, packets exceeding the threshold are dropped until the
rate falls back down beneath the threshold.
• Due to an ASIC chip limitation, the supported storm control modes include:
- broadcast
- broadcast + multicast
- broadcast + multicast + unknown unicast
This means that when multicast storm control is enabled, broadcast storm
control is also enabled (using the threshold value set by the multicast storm
control command). And when unknown unicast storm control is enabled,
broadcast and multicast storm control are also enabled (using the threshold
value set by the unknown unicast storm control command).
• Traffic storms can be controlled at the hardware level using this command or
at the software level using the auto-traffic-control command (page 4-238).
However, only one of these control types can be applied to a port. Enabling
hardware-level storm control on a port will disable automatic storm control on
that port.
• The rate limits set by this command are also used by automatic storm control
when the control response is set to rate limiting by the auto-traffic-control
action command (page 4-240).