Cisco 350 Series Administration Manual page 386

IP Configuration
IPv4 Management and Interfaces
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
Packet Type Arriving from Untrusted
Ingress Interface
DHCPOFFER Filter.
DHCPREQUEST Forward to trusted
interfaces only.
DHCPACK Filter.
DHCPNAK Filter.
DHCPDECLINE Check if there is
information in the
database. If the
information exists and
does not match the
interface on which the
message was received,
the packet is filtered.
Otherwise the packet is
forwarded to trusted
interfaces only, and the
entry is removed from
database.
DHCPRELEASE Same as
DHCPDECLINE.
DHCPINFORM Forward to trusted
interfaces only.
DHCPLEASEQUE Filtered.
RY
Arriving from Trusted Ingress
Interface
Forward the packet according to
DHCP information. If the destination
address is unknown the packet is
filtered.
Forward to trusted interfaces only.
Same as DHCPOFFER and an entry is
added to the DHCP Snooping Binding
database.
Same as DHCPOFFER. Remove entry
if exists.
Forward to trusted interfaces only
Same as DHCPDECLINE.
Forward to trusted interfaces only.
Forward.
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