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Enabling Storm Control

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Smart Switch Software User Manual GS748T Figure 4-21 Enabling Storm Control The Storm Control feature enables you to prevent network performance from being disrupted by specifying the threshold of ingress broadcast or multicast and broadcast packets on each port. The traffic source may be Multicast and Broadcast; Broadcast only; or Unknown Unicast, Multicast or Broadcast-or it may be disabled. A selected received threshold rate of between 1000 and 65535 packets per second may be specified in each case. If Multicast and Broadcast is selected as the source of the traffic, then the threshold value is the combined rate of both types of packet. If the incoming traffic rate of the specified packet types is above the specified value, the packets are discarded. 4-20 v1.0, October 2007 Configuring the Switch

Section	Page
Smart Switch Software User Manual GS748T	1
Contents	5
About This Manual	9
Chapter 1 Switch Management Overview	13
Switch Management Interface	13
System Requirements	14
Chapter 2 Using the Smartwizard Discovery Utility	15
Network with DHCP server	15
Network without DHCP Server	16
Manually Assigning Network Parameters	17
Configuring Your NIC Settings	18
Smartwizard Utilities	19
Password Change	19
Firmware Upgrade	19
Exit	21
Chapter 3 Basic Web Management	23
Accessing the Switch Management Home Screen	24
System Information Settings	25
IP Configuration	26
Changing Your Password	26
Managing Your System Configuration	27
Saving and Restoring Your Configuration	27
Performing a Factory Reset or a Device Reboot	28
Chapter 4 Configuring the Switch	31
Configuring Ports	31
Configuring the Link Aggregation Group (LAG)	33
Setting Up SNMP	35
Configuring and Creating VLANs	37
Adding and Configuring IEEE 802.1Q VLAN Groups	38
Configuring Port-Based VLANs	40
Selecting a Management VLAN	41
Enabling Spanning Tree Protocol	41
Establishing Multicast Groups	44
IGMP Snooping	44
Multicast Group Configuration	44
Multicast Group Membership	45
Enabling Jumbo Frames	46
Setting Rate Limits	47
Setting QoS Global Configuration	47
IEEE 802.1p-Based QoS	48
Differentiated Services Code Point (DSCP)-based QoS	49
Enabling Storm Control	50
Configuring the IP Access List	52
Controlling Switch Access by MAC Address and VLAN ID	52
Setting up Mirroring or “Sniffer Ports”	53
Viewing Packet Statistics	54
Appendix A Specifications and Default Values	57
GS748T Smart Switch Specifications	57
GS748T Smart Switch Features and Defaults	58
Appendix B Virtual Local Area Networks (VLANs)	61
IEEE 802.1Q VLANs	62
802.1Q Example	62
Port-based VLANs	63
Port-based VLAN Example Configuration	63
VLAN Configuration Results	64
Appendix C Network Cabling	65
Fast Ethernet Cable Guidelines	65
Category 5 Cable	65
Category 5 Cable Specifications	66
Twisted Pair Cables	66
Cabling	68
Near End Cross Talk (NEXT)	69
Patch Cables	70
RJ-45 Plug and RJ-45 Connectors	70

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Smart Switch Software User Manual GS748T

4-20

Configuring the Switch

v1.0, October 2007

Enabling Storm Control

The Storm Control feature enables you to prevent network performance from being disrupted by

specifying the threshold of ingress broadcast or multicast and broadcast packets on each port. The

traffic source may be Multicast and Broadcast; Broadcast only; or Unknown Unicast, Multicast or

Broadcast—or it may be disabled. A selected received threshold rate of between 1000 and 65535

packets per second may be specified in each case. If Multicast and Broadcast is selected as the

source of the traffic, then the threshold value is the combined rate of both types of packet. If the

incoming traffic rate of the specified packet types is above the specified value, the packets are

discarded.

Figure 4-21