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xxxvi PowerConnect B-Series FCX Configuration Guide
53-1002266-01
DHCP snooping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1349
How DHCP snooping works . . . . . . . . . . . . . . . . . . . . . . . . . . 1350
System reboot and the binding database . . . . . . . . . . . . . . .1351
Configuration notes and feature limitations . . . . . . . . . . . . .1351
Configuring DHCP snooping . . . . . . . . . . . . . . . . . . . . . . . . . .1351
Clearing the DHCP binding database. . . . . . . . . . . . . . . . . . 1352
Displaying DHCP snooping status and ports . . . . . . . . . . . . 1353
Displaying the DHCP snooping binding database . . . . . . . . 1353
Displaying DHCP binding entry and status. . . . . . . . . . . . . . 1353
DHCP snooping configuration example . . . . . . . . . . . . . . . . 1353
DHCP relay agent information (DHCP Option 82) . . . . . . . . . . . . 1354
Configuration notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1355
DHCP Option 82 sub-options . . . . . . . . . . . . . . . . . . . . . . . . 1355
Configuring DHCP option 82 . . . . . . . . . . . . . . . . . . . . . . . . . 1357
Viewing information about DHCP option 82 processing . . . 1359
IP source guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1360
Configuration notes and feature limitations . . . . . . . . . . . . 1361
Enabling IP source guard on a port . . . . . . . . . . . . . . . . . . . 1362
Defining static IP source bindings . . . . . . . . . . . . . . . . . . . . 1362
Enabling IP source guard per-port-per-VLAN . . . . . . . . . . . . 1363
Enabling IP source guard on a VE. . . . . . . . . . . . . . . . . . . . . 1363
Displaying learned IP addresses. . . . . . . . . . . . . . . . . . . . . . 1363
Chapter 40 Securing SNMP Access
SNMP overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1365
Establishing SNMP community strings . . . . . . . . . . . . . . . . . . . . 1366
Encryption of SNMP community strings. . . . . . . . . . . . . . . . 1366
Adding an SNMP community string . . . . . . . . . . . . . . . . . . . 1366
Displaying the SNMP community strings . . . . . . . . . . . . . . . 1368
Using the user-based security model. . . . . . . . . . . . . . . . . . . . . . 1369
Configuring your NMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1369
Configuring SNMP version 3 on Dell PowerConnect devices1369
Defining the engine id . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1370
Defining an SNMP group. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1370
Defining an SNMP user account. . . . . . . . . . . . . . . . . . . . . . .1371
Defining SNMP views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1373
SNMP version 3 traps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1374
Defining an SNMP group and specifying which
view is notified of traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1374
Defining the UDP port for SNMP v3 traps . . . . . . . . . . . . . . 1375
Trap MIB changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1375
Specifying an IPv6 host as an SNMP trap receiver . . . . . . . .1376
SNMP v3 over IPv6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1376
Specifying an IPv6 host as an SNMP trap receiver . . . . . . . .1376
Viewing IPv6 SNMP server addresses . . . . . . . . . . . . . . . . . .1376