Cisco 500 Series Administration Manual page 364

IP Configuration
IPv4 Management and Interfaces
Cisco 500 Series Managed Switch Administration Guide
Packet Type
DHCPRELEASE
DHCPINFORM
DHCPLEASEQUE
RY
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
Option
DHCP Snooping
Option 82 Insertion
Option 82 Passthrough
Verify MAC Address
Backup DHCP Snooping
Binding Database
DHCP Relay
Configuring DHCP Work Flow
To configure DHCP Relay and DHCP Snooping:
Arriving from
Untrusted Ingress
Interface
Same as
DHCPDECLINE.
Forward to trusted
interfaces only.
Filtered.
Default State
Enabled
Not enabled
Not enabled
Enabled
Not enabled
Disabled
Arriving from Trusted Ingress
Interface
Same as DHCPDECLINE.
Forward to trusted interfaces
only.
Forward.
18
362