Multicast and Routing Guide K/KA/KB.15.15

associated with the client DHCP packet and
the switch remote ID. The default switch
remote ID is the MAC address of the switch
on which the packet was received from the
client.
To use the incoming VLAN's IP address or
the Management VLAN IP address (if
configured) for the remote ID instead of the
switch MAC address, use the ip or
mgmt-vlan option (below.)
drop Configures the routing switch to
unconditionally drop any client DHCP packet
received with existing Option 82 fields. This
means that such packets will not be
forwarded. Use this option where access to
the routing switch by untrusted clients is
possible.
If the routing switch receives a client DHCP
packet without an Option 82 field, it adds
an Option 82 field to the client and forwards
the packet. The added Option 82 field
includes the switch circuit ID (inbound port
number*) associated with the client DHCP
packet and the switch remote ID. The default
switch remote ID is the MAC address of the
switch on which the packet was received
from the client.
To use the incoming VLAN's IP address or
the Management VLAN IP address (if
configured) for the remote ID instead of the
switch MAC address, use the ip or
mgmt-vlan option (below.)
keep For any client DHCP packet received with
existing Option 82 fields, configures the
routing switch to forward the packet as-is,
without replacing or adding to the existing
Option 82 fields.
validate Operates when the routing switch is
configured with append, replace, or drop
as a forwarding policy. With validate
enabled, the routing switch applies stricter
rules to an incoming Option 82 server
response to determine whether to forward
or drop the response. For more information,
see “Validation of server response packets”
(page 243).
[ ip | mac | mgmt-vlan ] Specifies the remote ID suboption that the
switch uses in Option 82 fields added or
appended to DHCP client packets. The type
of remote ID defines DHCP policy areas in
the client requests sent to the DHCP server.
If a remote ID suboption is not configured,
234 Dynamic Host Configuration Protocol