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General Security Measures
4-131
4
Example
DHCP Snooping Commands
DHCP snooping allows a switch to protect a network from rogue DHCP servers or
other devices which send port-related information to a DHCP server. This
information can be useful in tracking an IP address back to a physical port. This
section describes commands used to configure DHCP snooping.
Console#show network-access mac-address-table
---- ----------------- --------------- --------- -------------------------
Port MAC-Address RADIUS-Server Attribute Time
---- ----------------- --------------- --------- -------------------------
1/1 00-00-01-02-03-04 172.155.120.17 Static 00d06h32m50s
1/1 00-00-01-02-03-05 172.155.120.17 Dynamic 00d06h33m20s
1/1 00-00-01-02-03-06 172.155.120.17 Static 00d06h35m10s
1/3 00-00-01-02-03-07 172.155.120.17 Dynamic 00d06h34m20s
Console#
Table 4-42 DHCP Snooping Commands
Command
Function
Mode
Page
ip dhcp snooping
Enables DHCP snooping globally
GC
4-132
ip dhcp snooping vlan
Enables DHCP snooping on the specified VLAN
GC
4-133
ip dhcp snooping trust
Configures the specified interface as trusted
IC
4-134
ip dhcp snooping verify
mac-address
Verifies the client’s hardware address stored in the DHCP
packet against the source MAC address in the Ethernet header
GC
4-135
ip dhcp snooping
information option
Enables or disables DHCP Option 82 information relay
GC
4-136
ip dhcp snooping
information policy
Sets the information option policy for DHCP client packets that
include Option 82 information
GC
4-137
show ip dhcp snooping Shows the DHCP snooping configuration settings PE
4-138
show ip dhcp snooping
binding
Shows the DHCP snooping binding table entries
PE
4-138
Summary of Contents for 8126PL2-F
Page 1: ...MANAGEMENT GUIDE ta TigerSwitchTM 10 100 1000 L2 Lite SMB PoE Gigabit Switch SMC8126PL2 F ...
Page 2: ......
Page 6: ...vi ...
Page 22: ...Contents xxii ...
Page 26: ...Tables xxvi ...
Page 48: ...Initial Configuration 2 10 2 ...
Page 117: ...User Authentication 3 69 3 Web Click Security AAA Summary Figure 3 43 AAA Accounting Summary ...
Page 590: ...Command Line Interface 4 302 4 ...
Page 604: ...Glossary Glossary 8 ...
Page 612: ...Index 8 Index ...
Page 613: ......
Page 614: ...149100000023A R01 SMC8126PL2 F ...