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IPv4 Management and Interfaces
Cisco Small Business 300 Series Managed Switch Administration Guide 272
16
DHCP Snooping Along With DHCP Relay
If both DHCP Snooping and DHCP Relay are globally enabled, then if DHCP
Snooping is enabled on the client's VLAN, DHCP Snooping rules contained in the
DHCP Snooping Binding database are applied, and the DHCP Snooping Binding
database is updated in the client's and DHCP server’s VLAN, for packets that are
relayed.
DHCP Default Configuration
The following describes DHCP Snooping and DHCP Relay default options.
DHCP Default Options
Configuring DHCP Work Flow
To configure DHCP Relay and DHCP Snooping:
DHCPRELEASE Same as
DHCPDECLINE.
Same as DHCPDECLINE.
DHCPINFORM Forward to trusted
interfaces only.
Forward to trusted interfaces
only.
DHCPLEASEQUE
RY
Filtered. Forward.
Packet Type Arriving from
Untrusted Ingress
Interface
Arriving from Trusted Ingress
Interface
Option Default State
DHCP Snooping Enabled
Option 82 Insertion Not enabled
Option 82 Passthrough Not enabled
Verify MAC Address Enabled
Backup DHCP Snooping Binding
Database
Not enabled
DHCP Relay Disabled