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IPv4 Management and Interfaces
Cisco Small Business 300 Series Managed Switch Administration Guide 266
16
The following describes how DHCP request packets are handled when both
DHCP Snooping and DHCP Relay are enabled:
Option 82
Insertion
Disabled
Packet is sent
without Option
82
Packet is sent
with the
original
Option 82
Relay –
inserts Option
82
Bridge – no
Option 82 is
inserted
Relay –
discards the
packet
Bridge –
Packet is sent
with the
original
Option 82
Option 82
Insertion
Enabled
Relay – is sent
with Option 82
Bridge – no
Option 82 is
sent
Packet is sent
with the
original
Option 82
Relay – is sent
with Option
82
Bridge – no
Option 82 is
sent
Relay –
discards the
packet
Bridge –
Packet is sent
with the
original
Option 82
DHCP Relay
VLAN with IP Address
DHCP Relay
VLAN without IP Address
Packet arrives
without Option
82
Packet
arrives with
Option 82
Packet arrives
without
Option 82
Packet arrives
with Option
82
Option 82
Insertion
Disabled
Packet is sent
without Option
82
Packet is
sent with the
original
Option 82
Relay – inserts
Option 82
Bridge – no
Option 82 is
inserted
Relay –
discards the
packet
Bridge –
Packet is sent
with the
original
Option 82
DHCP Relay
VLAN with IP Address
DHCP Relay
VLAN without IP Address