SMC Networks 7824M/FSW - annexe 1 Management Manual page 509

• unit - Stack unit. (Range: 1)
• port - Port number. (Range: 1-28)
• lease-time - The time after which an entry is removed from the table.
(Range: 0-4294967295, where 0 indicates a permanent entry)
Default Setting
None
Command Mode
Global Configuration
Command Usage
• If DHCP snooping is enabled globally, and also enabled on the VLAN
where the DHCP packet is received on a trusted port, a dynamic
DHCP snooping entry is added to the binding table. An entry is added
or removed dynamically whenever a client has gotten or released an IP
address from a DHCP server.
• Table entries can also be statically configured using the ip dhcp
binding command. Table entries includes a MAC address, IP address,
lease time, entry type (Dynamic-DHCP-Binding,
Static-DHCP-Binding), VLAN identifier, and port identifier.
• If the DHCP snooping is disabled globally, all dynamic bindings are
removed from the binding table; all static bindings are retained in the
binding table but will have no effect until DHCP snooping is globally
re-enabled.
• If DHCP snooping is enabled globally, and then disabled on a VLAN,
all dynamic bindings learned for this VLAN are removed from the
binding table; all static bindings configured for this VLAN are retained
in the binding table but will have no effect until snooping is re-enabled
on the VLAN.
• A static DHCP snooping entry can be added in the binding table under
any of the following conditions:
- If there is no binding with same VLAN ID and MAC address.
- If there is a binding with same VLAN ID and MAC address, and the
entry type is static IP source guard binding, static DHCP snooping
binding, or dynamic DHCP snooping binding, the new entry will
replace the old one.
DHCP S
NOOPING
C
OMMANDS
22-15