American Fibertek SM9p - Manual (Page 145)

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 Ingress Limit Packet type: select the packet type that wants to filter. The packet
types have all type packet, broadcast/multicast/unknown unicast packet,
broadcast/multicast packet, and broadcast packet only. The
broadcast/multicast/unknown unicast packet, broadcast/multicast packet, and
broadcast packet only are only for ingress packet. The egress rate only supports all
type packet.
Rate Limiting interface
 All the ports support port ingress and egress rate control. For example, assume port 1
is 10Mbps, users can set it’s effective egress rate is 1Mbps, ingress rate is 500Kbps.
The switch performs the ingress rate by packet counter to meet the specified rate.
 Ingress: enter the port effective ingress rate. The default value is “0”.
 Egress: enter the port effective ingress rate. The default value is “0”.
 Click
Apply to apply the settings.
[NOTE] Rate Range is from 100 kbps to 102400 kbps (or 250000 kbps for giga ports)
and zero means no limit