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IP Configuration
IPv4 Management and Interfaces
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
The following describes how DHCP Reply packets are handled when DHCP Snooping is
disabled:
DHCP Relay
VLAN with IP Address
Packet arrives
without Option
82
Option 82
Packet is sent
insertion
without Option
disabled
82
Option 82
Packet is sent
insertion
without Option
enabled
82
DHCP Relay
VLAN without IP Address
Packet arrives
Packet arrives
with Option 82
without Option
82
Packet is sent
Relay – discards
with the original
Option 82
Option 82
Bridge – Packet
is sent without
Option 82
Relay – Packet
Relay – discards
is sent without
Option 82
Option 82
Bridge – Packet
Bridge – Packet
is sent without
is sent with the
Option 82
Option 82
15
Packet arrives
with Option 82
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
270
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