Users Guide

Dell PowerConnect 55xx Systems User Guide 565
DHCPOFFER Filter. Forward the packet
according to DHCP
information. If the
destination address is
unknown the packet is
filtered.
DHCPREQUEST Forward to trusted
interfaces only.
Forward to trusted
interfaces only.
DHCPACK Filter. Same as DHCPOFFER
and an entry is added to
the Binding database.
DHCPNAK Filter. Same as DHCPOFFER.
Remove entry if exists.
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.
Forward to trusted
interfaces only
DHCPRELEASE Same as
DHCPDECLINE.
Same as
DHCPDECLINE.
DHCPINFORM Forward to trusted
interfaces only.
Forward to trusted
interfaces only.
DHCPLEASEQUERY Filtered. Forward.
Table 19-1. DHCP Packet Handling when DHCP Snooping is Enabled (Continued)
Packet Type Arriving from Untrusted
Ingress Interface
Arriving from Trusted
Ingress Interface