Cisco 350 Series Administration Manual page 383

16
296
DHCP Relay
VLAN with IP Address
Option 82 Packet is sent
insertion without Option
disabled 82
Option 82 Packet is sent
insertion without Option
enabled 82
The following describes how DHCP reply packets are handled when both DHCP Snooping
and DHCP Relay are enabled
DHCP Relay
VLAN with IP Address
Packet arrives
without Option
82
Packet is sent
with the original
Option 82
Relay – Packet
is sent without
Option 82
Bridge – Packet
is sent with the
Option 82
Packet arrives
with Option 82
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
IPv4 Management and Interfaces
DHCP Relay
VLAN without IP Address
Relay – discards Relay –
Option 82
1. If reply
Bridge – Packet originates in
is sent without device, packet is
Option 82 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 – discards Relay – Packet
Option 82 is sent without
Option 82
Bridge – Packet
is sent without Bridge – Packet
Option 82 is sent with the
Option 82
DHCP Relay
VLAN without IP Address
Packet arrives Packet arrives with
without Option Option 82
82
IP Configuration