Cisco SX350 Series Administration Manual page 359

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DHCP Relay
VLAN with IP Address
Option 82 Relay – is sent
Insertion with Option 82
Enabled
Bridge – no
Option 82 is sent
The following describes how DHCP request packets are handled when both DHCP Snooping
and DHCP Relay are enabled:
DHCP Relay
VLAN with IP Address
Packet arrives
without Option 82
Option 82 Packet is sent
Insertion without Option 82
Disabled
Option 82 Relay – is sent
Insertion with Option 82
Enabled
Bridge – Option
82 is added
(if port is trusted,
behaves as if
DHCP Snooping is
not enabled)
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
DHCP Relay
VLAN without IP Address
Packet is sent Relay – is sent
with the original with Option 82
Option 82
Bridge – no
Option 82 is
sent
DHCP Relay
VLAN without IP Address
Packet arrives Packet arrives
with Option 82 without Option
82
Packet is sent Relay – inserts
with the Option 82
original Option
Bridge – no
82
Option 82 is
inserted
Packet is sent Relay – is sent
with the with Option 82
original Option
Bridge – Option
82
82 is inserted
(if port is
trusted, behaves
as if DHCP
Snooping is not
enabled)
IP Configuration
IPv4 Management and Interfaces
Relay – discards
the packet
Bridge – Packet
is sent with the
original Option
82
Packet arrives
with Option 82
Relay – discards
the packet
Bridge – Packet
is sent with the
original Option
82
Relay –discards
the packet
Bridge – Packet
is sent with the
original Option
82