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3.18.3 Storm Setting
Bandwidth Management function is used to set up the limit of Ingress and Egress bandwidth for each port.
Parameter description:
y
Storm Type:
Disable:
Disable the function of the bandwidth storm control.
y
Broadcast Storm Control:
Enable the function of bandwidth storm control for broadcast packets.
y
Multicast Storm Control:
Enable the function of bandwidth storm control for multicast packets.
y
Unknown Unicast Storm Control:
Enable the function of bandwidth storm control for unknown unicast packets. These packets are the
MAC address that had not completed the learning process yet.
y
Broadcast, Multicast, and Unknown Unicast Storm Control:
Enable the function of bandwidth storm control for all packets in transmission.
y
Storm Rate :
Set up the limit of bandwidth for storm type you choose. Valid value of the storm rate ranges from
1-100 with the minimum unit of 1. And only integer is acceptable. Default is 100.
3.19 QoS(Quality of Service) Configuration
The switch supports 5 kinds of QoS, are as follows, MAC Priority, 802.1p Priority, IP TOS Priority, and DiffServ
DSCP Priority. Port Based Priority has a special name called VIP Port in the switch. Any packets enter VIP
Port will have highest transmitting priority. MAC Priority act on the destination address of MAC in packets.
VLAN tagged Priority field is effected by 802.1p Priority setting. IP TOS Priority affects TOS fields of IP header,
and you can find it has 8-bit SERVICE TYPE field that specifies how the datagram should be handled. The
field could be divided into six subfields as follows, PRECEDENCE (3 bits), D-Type (Delay Priority, 1 bit ),
T-Type (Throughput Priority, 1bit), R-Type (Reliability Priority, 1bit ), M-Type (Monetary Cost Priority, 1bit ), and
UNUSED (1bit ).
User can randomly control these fields to achieve some special QoS goals. When bits D, T, R, or M set, the D
bit requests low delay, the T bit requests high throughput, the R bit requests high reliability, and the M bit
requests low cost.
