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User’s Manual of IGSW-2840
483
When DHCP snooping is globally enabled, configuration changes for specific VLANs have the following effects: -If DHCP
snooping is disabled on a VLAN, all dynamic bindings learned for
this VLAN are removed from the binding table.
Example
This
Example
enables DHCP snooping for VLAN 1.
Console(config)#ip dhcp snooping vlan 1
Console(config)#
Related Commands
ip dhcp snooping
ip dhcp snooping trust
ip dhcp snooping trust
This command configures the specified interface as trusted. Use the no form to restore the default setting.
Syntax
[no] ip dhcp snooping trust
Default Setting
All interfaces are untrusted
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
A trusted interface is an interface that is configured to receive only messages from within the network. An untrusted
interface is an interface that is configured to receive messages from outside the network or firewall.
Set all ports connected to DHCP servers within the local network or firewall to trusted, and all other ports outside the local
network or firewall to untrusted.
When DHCP snooping ia enabled globally using the ip dhcp snooping command (page 4-146), and enabled on a VLAN
with ip dhcp snooping vlan command (page 4-148), DHCP packet filtering will be performed on any untrusted ports within
the VLAN according to the default status, or as specifically configured for an interface with the no ip dhcp snooping trust
command.
When an untrusted port is changed to a trusted port, all the dynamic DHCP snooping bindings associated with this port
are removed.
Additional considerations when the switch itself is a DHCP client – The port(s) through which it submits a client request to
the DHCP server must be configured as trusted.
Содержание IGSW-2840
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