Multicast and Routing Guide K/KA/KB.15.15

Table 29 Relay agent management of DHCP server response packets.
Validation
disabled
Validation
enabled
Option 82 configurationResponse packet content
(the
default)
on the
relay
agent
Forward
server
Drop the
server
append, replace, or drop
1
Valid DHCP server response
packet without an Option 82
field. responseresponse
packet. packet to
a
downstream
device.
Forward
server
Forward
server
keep
2
responseresponse
packet topacket to
aa
downstream
device.
downstream
device.
Forward
server
Drop the
server
appendThe server response packet
carries data indicating a
responseresponse
packet.
given routing switch is the
primary relay agent for the packet to
original client request, but a
the associated Option 82 downstream
device.field in the response contains
a remote ID and circuit ID
Drop the
server
Drop the
server
replace or drop
1
combination that did not
originate with the given
relay agent.
response
packet.
response
packet.
Forward
server
Forward
server
keep
2
responseresponse
packet topacket to
aa
downstream
device.
downstream
device.
Forward
server
Drop the
server
appendThe server response packet
carries data indicating a
responseresponse
packet.
given routing switch is the
primary relay agent for the packet to
original client request, but a
the associated Option 82 downstream
device.field in the response contains
a Remote ID that did not
Drop the
server
Drop the
server
replace or drop
1
originate with the relay
agent.
response
packet.
response
packet.
Forward
server
Forward
server
keep
2
responseresponse
packet topacket to
aa
downstream
device.
downstream
device.
Forward
server
Forward
server
append, keep
2
, replace, or drop
1
All other server response
packets
3
responseresponse
244 Dynamic Host Configuration Protocol