Microsens MS453490M Management Guide - Manual (Page 707)

C HAPTER 27 | Interface Commands
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switchport packet-
rate
This command configures broadcast, multicast and unknown unicast storm
control. Use the no form to restore the default setting.
S YNTAX
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 Kbps for Fast Ethernet ports,
64-1000000 Kbps for Gigabit Ethernet ports)
D EFAULT S ETTING
Broadcast Storm Control: Enabled, packet-rate limit: 64 kbps
Multicast Storm Control: Disabled
Unknown Unicast Storm Control: Disabled
C OMMAND M ODE
Interface Configuration (Ethernet)
C OMMAND U SAGE
◆ 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.
◆ Using both rate limiting and storm control on the same interface may
lead to unexpected results. For example, suppose broadcast storm
control is set to 500 Kbps by the command “switchport broadcast
packet-rate 500,” and the rate limit is set to 20000 Kbps by the
command “rate-limit input 20000" on a Fast Ethernet port. Since 20000
Kbps is 1/5 of line speed (100 Mbps), the received rate will actually be
100 Kbps, or 1/5 of the 500 Kbps limit set by the storm control
command. It is therefore not advisable to use both of these commands
on the same interface.
E XAMPLE
The following shows how to configure broadcast storm control at 600
kilobits per second:
Console(config)#interface ethernet 1/5
Console(config-if)#switchport broadcast packet-rate 600
Console(config-if)#