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D-Link DGS-3200-16 User Manual - Page 110

Safeguard Engine example, NOTICE, Security > Safeguard Engine, Apply

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xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch Figure 5 - 1. Safeguard Engine example For every consecutive checking interval that reveals a packet flooding issue, the Switch will double the time it will discard ingress ARP and IP broadcast packets and packets from untrusted IP addresses. In the example above, the Switch doubled the time for dropping ARP and IP broadcast packets when consecutive flooding issues were detected at 5-second intervals. (First stop = 5 seconds, second stop = 10 seconds, third stop = 20 seconds) Once the flooding is no longer detected, the wait period for dropping ARP and IP broadcast packets will return to 5 seconds and the process will resume. In Fuzzy mode, once the Safeguard Engine has entered the Exhausted mode, the Safeguard Engine will decrease the packet flow by half. After returning to Normal mode, the packet flow will be increased by 25%. The switch will then return to its interval checking and dynamically adjust the packet flow to avoid overload of the Switch. NOTICE: When Safeguard Engine is enabled, the Switch will allot bandwidth to various traffic flows (ARP, IP) using the FFP (Fast Filter Processor) metering table to control the CPU utilization and limit traffic. This may limit the speed of routing traffic over the network. Users can enable the Safeguard Engine or configure advanced Safeguard Engine settings for the Switch. To view the following window, click Security > Safeguard Engine: Figure 5 - 2. Safeguard Engine window To enable the Safeguard Engine option, click the Enabled radio button next to Safeguard Engine State at the top of the window. To configure the advanced settings for the Safeguard Engine, set the following parameters and click Apply. 97

Section	Page
Intended Readers	9
Typographical Conventions	9
Notes, Notices, and Cautions	10
Safety Cautions	10
General Precautions for Rack-Mountable Products	11
Lithium Battery Precaution	13
Protecting Against Electrostatic Discharge	13
Web-based Switch Configuration	14
Introduction	14
Logging onto the Web Manager	14
Web-based User Interface	15
Areas of the User Interface	15
Web Pages	16
Configuration	17
Device Information	17
System Information	18
Serial Port Settings	19
IP Address	19
Setting the Switch’s IP Address using the Console Interface	21
IPv6 Interface Settings	21
IPv6 Route Table	22
IPv6 Neighbor Settings	23
Port Configuration	24
Port Settings	24
Port Description	25
Port Error Disabled	25
Static ARP Settings	26
User Accounts	27
Admin and User Privileges	27
System Log Configuration	28
System Log Settings	28
System Log Host	29
System Severity Settings	29
DHCP/BOOTP Relay	30
DHCP/BOOTP Relay Global Settings	30
The Implementation of DHCP Relay Agent Information Option 82	32
DHCP/BOOTP Relay Interface Settings	33
DHCP Local Relay Settings	33
DHCP Auto Configuration Settings	34
MAC Address Aging Time	35
Web Settings	35
Telnet Settings	36
Password Encryption	36
CLI Paging Settings	37
Firmware Information	37
Power Saving Settings	38
Dual Configuration Settings	39
SMTP Settings	40
Ping Test	41
SNTP Settings	42
Time Settings	42
TimeZone Settings	43
MAC Notification Settings	44
MAC Notification Global Settings	44
MAC Notification Port Settings	45
SNMP Settings	46
Traps	46
MIBs	46
SNMP Global State Settings	47
SNMP View Table	47
SNMP Group Table	48
SNMP User Table	49
SNMP Community Table	50
SNMP Host Table	51
SNMP v6Host Table	52
SNMP Engine ID	53
SNMP Trap Configuration	53
RMON	53
Single IP Management	54
Upgrade to v1.61	55
Single IP Settings	56
Topology	57
Tool Tips	59
Right-Click	60
Group Icon	60
Commander Switch Icon	61
Member Switch Icon	62
Candidate Switch Icon	62
Menu Bar	63
File	63
Group	63
Device	63
View	63
Help	63
Firmware Upgrade	64
Configuration File Backup/Restore	64
Upload Log File	64
Layer 2 Features	65
Jumbo Frame	65
Egress Filter Settings	66
802.1Q VLAN	66
Understanding IEEE 802.1p Priority	66
VLAN Description	67
802.1Q VLAN Tags	68
Port VLAN ID	69
Tagging and Untagging	70
Ingress Filtering	70
Default VLANs	70
Port-based VLANs	71
VLAN Segmentation	71
VLAN and Trunk Groups	71
802.1v Protocol VLAN	75
802.1v Protocol Group Settings	75
802.1v Protocol VLAN Settings	75
MAC Based VLAN Settings	77
GVRP Settings	77
PVID Auto Assign Settings	78
Trunking	79
VLAN Trunk Settings	81
LACP Port Settings	82
Traffic Segmentation	83
IGMP Snooping	83
IGMP Snooping Settings	83
Data Driven Learning Settings	84
ISM VLAN Settings	85
Restrictions and Provisos	85
ISM Profile Settings	86
IP Multicast Profile Settings	86
Limited Multicast Address Range Settings	87
Max Multicast Group Settings	88
MLD Snooping Settings	88
MLD Control Messages	88
Port Mirroring	90
Loopback Detection Settings	91
Spanning Tree	92
802.1Q-2005 MSTP	92
802.1D-2004 Rapid Spanning Tree	92
Port Transition States	93
Edge Port	93
P2P Port	93
802.1D-1998/802.1D-2004/802.1Q-2005 Compatibility	93
STP Bridge Global Settings	94
STP Port Settings	95
MST Configuration Identification	97
STP Instance Settings	98
MSTP Port Information	99
Forwarding & Filtering	100
Unicast Forwarding	100
Multicast Forwarding	100
Multicast Filtering Mode	101
QoS	102
Understanding QoS	103
Bandwidth Control	104
Traffic Control	105
802.1p Default Priority	107
802.1p User Priority	107
QoS Scheduling Mechanism	108
Security	109
Safeguard Engine	109
Trusted Host	111
IP-MAC-Port Binding	112
IMP Global Settings	112
IMP Port Settings	112
IMP Entry Settings	114
DHCP Snooping Entries	114
MAC Block List	115
Port Security	116
Port Security Settings	116
Port Lock Entries	117
DHCP Server Screening	118
DHCP Screening Port Settings	118
DHCP Offer Filtering	118
Guest VLAN	120
Limitations Using the Guest VLAN	120
802.1X (Port-Based and Host-Based Access Control)	121
Authentication Server	122
Authenticator	122
Client	123
Authentication Process	123
Understanding 802.1X Port-based and Host-based Network Access Control	124
Port-Based Network Access Control	124
Host-Based Network Access Control	125
802.1X Settings	125
802.1X User	127
Initialize Port(s)	128
Reauthenticate Port(s)	129
Authentic RADIUS Server	130
SSL Settings	131
SSH	133
SSH Configuration	133
SSH Authmode and Algorithm Settings	134
SSH User Authentication Mode	136
Access Authentication Control	137
Authentication Policy and Parameter Settings	138
Application Authentication Settings	138
Authentication Server Group	139
Authentication Server Host	140
Login Method Lists	142
Enable Method Lists	143
Configure Local Enable Password	144
Enable Admin	144
MAC-based Access Control	145
Notes about MAC-based Access Control	145
MAC-based Access Control Settings	145
MAC-based Access Control Local Settings	147
Web-based Access Control (WAC)	147
Conditions and Limitations	149
WAC Global Settings	149
WAC User Settings	150
WAC Port Settings	151
JWAC	152
JWAC Global Settings	152
JWAC Port Settings	154
JWAC User Settings	155
JWAC Customize Page Language	155
JWAC Customize Page	156
Multiple Authentication	156
Any (MAC, 802.1X or WAC) Mode	157
Any (MAC, 802.1X or JWAC) Mode	157
802.1X & IMPB Mode	158
IMPB & WAC/JWAC Mode	158
Authorization Network State Settings	159
Multiple Authentication Settings	159
Guest VLAN	160
IGMP Access Control Settings (IGMP Authentication)	161
ACL	162
Access Profile List	162
CPU Access Profile List	176
Time Range Settings	189
Monitoring	190
Device Environment	190
Cable Diagnostic	191
CPU Utilization	191
Port Utilization	193
Packet Size	194
Packets	196
Received (RX)	196
UMB_cast (RX)	198
Transmitted (TX)	199
Errors	201
Received (RX)	201
Transmitted (TX)	203
Port Access Control	205
Authenticator State	205
Authenticator Statistics	207
Authenticator Session Statistics	209
Authenticator Diagnostics	211
RADIUS Authentication	213
RADIUS Account Client	214
Browse ARP Table	216
Browse VLAN	216
Browse Router Port	217
Browse MLD Router Port	217
Browse Session Table	218
IGMP Snooping Group	218
MLD Snooping Group	219
WAC Authenticating State	220
JWAC Host Table	221
MAC Address Table	222
System Log	223
MAC-based Access Control Authentication State	224
Save Services and Tools	225
Save Configuration ID 1	225
Save Configuration ID 2	226
Save Log	226
Save All	226
Configuration File Backup & Restore	227
Upload Log File	227
Reset	227
Download Firmware	228
Reboot System	228
Appendix A – Mitigating ARP Spoofing Attacks Using Packet Content ACL	229
How ARP Spoofing Attacks a Network	232
Prevent ARP Spoofing via Packet Content ACL	233
Appendix B – Switch Log Entries	236
Appendix C – Trap Logs	247
Appendix D – Password Recovery Procedure	250
Appendix E – Glossary	251

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xStack

DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch

Figure 5 - 1. Safeguard Engine example

For every consecutive checking interval that reveals a packet flooding issue, the Switch will double the time it will discard ingress

ARP and IP broadcast packets and packets from untrusted IP addresses. In the example above, the Switch doubled the time for

dropping ARP and IP broadcast packets when consecutive flooding issues were detected at 5-second intervals. (First stop = 5

seconds, second stop = 10 seconds, third stop = 20 seconds) Once the flooding is no longer detected, the wait period for dropping

ARP and IP broadcast packets will return to 5 seconds and the process will resume.

Fuzzy

mode, once the Safeguard Engine has entered the Exhausted mode, the Safeguard Engine will decrease the packet flow

by half. After returning to Normal mode, the packet flow will be increased by 25%. The switch will then return to its interval

checking and dynamically adjust the packet flow to avoid overload of the Switch.

NOTICE:

When Safeguard Engine is enabled, the Switch will allot bandwidth to various

traffic flows (ARP, IP) using the FFP (Fast Filter Processor) metering table to control the

CPU utilization and limit traffic. This may limit the speed of routing traffic over the network.

Users can enable the Safeguard Engine or configure advanced Safeguard Engine settings for the Switch.

To view the following window, click

Security > Safeguard Engine

Figure 5 - 2. Safeguard Engine window

To enable the Safeguard Engine option, click the Enabled radio button next to Safeguard Engine State at the top of the window.

To configure the advanced settings for the Safeguard Engine, set the following parameters and click

Apply