Chapter 9
| General Security Measures
DHCPv4 Snooping
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ip dhcp snooping
database flash
This command writes all dynamically learned snooping entries to flash memory.
Command Mode
Privileged Exec
Command Usage
This command can be used to store the currently learned dynamic DHCP snooping
entries to flash memory. These entries will be restored to the snooping table when
the switch is reset. However, note that the lease time shown for a dynamic entry
that has been restored from flash memory will no longer be valid.
Example
Console#ip dhcp snooping database flash
Console#
show ip dhcp
snooping
This command shows the DHCP snooping configuration settings.
Command Mode
Privileged Exec
Example
Console#show ip dhcp snooping
Global DHCP Snooping Status: enabled
DHCP Snooping Information Option Status: enabled
DHCP Snooping Information Option Sub-option Format: extra subtype included
DHCP Snooping Information Option Remote ID: MAC Address (ascii encoded)
DHCP Snooping Information Option TR101 Board ID: none
DHCP Snooping Information Policy: replace
DHCP Snooping is configured on the following VLANs:
1,
Verify Source MAC-Address: enabled
DHCP Snooping rate limit: unlimited
Interface Trusted Circuit-ID mode Circuit-ID Value
---------- ---------- --------------- --------------------------------
Eth 1/1 No Vlan-Unit-Port ---
Eth 1/2 No Vlan-Unit-Port ---
Eth 1/3 No Vlan-Unit-Port ---
Eth 1/4 No Vlan-Unit-Port ---
Eth 1/5 No Vlan-Unit-Port ---
.
.
.
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