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DHCP Relay
VLAN with IP Address
Option 82
Packet is sent
insertion
without
disabled
Option 82
Option 82
Packet is sent
insertion
without
enabled
Option 82
Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
DHCP Relay
VLAN without IP Address
Packet is sent
Relay –
with the
discards
original
Option 82
Option 82
Bridge –
Packet is sent
without
Option 82
Relay –
Relay –
Packet is sent
discards
without
Option 82
Option 82
Bridge –
Bridge –
Packet is sent
Packet is sent
without
with the
Option 82
Option 82
IP Configuration
IPv4 Management and Interfaces
Relay –
1. If reply
originates in
device,
packet is sent
without
Option 82
2. If reply
does not
originate in
device,
packet is
discarded
Bridge –
Packet is sent
with the
original
Option 82
Relay –
Packet is sent
without
Option 82
Bridge –
Packet is sent
with the
Option 82