HP 6120G/XG HP ProCurve Series 6120 Blade Switches Multicast and Routing Guide - Page 105

mgmt-vlan, validate ], fields, con s the routing switch to forward

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IP Routing Features Configuring DHCP Relay drop: Configures the routing switch to unconditionally drop any client DHCP packet received with existing Option 82 field(s). 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 field(s), configures the routing switch to forward the packet as-is, without replacing or adding to the existing Option 82 field(s). [ validate ]: This option operates when the routing switch is config­ ured 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 informa­ tion, refer to "Validation of Server Response Packets" on page 3-56. 3-59

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IP Routing Features
Configuring DHCP Relay
drop:
Configures the routing switch to unconditionally drop any
client DHCP packet received with existing Option 82 field(s).
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 field(s), configures the routing switch to forward the
packet as-is, without replacing or adding to the existing
Option 82 field(s).
[ validate ]:
This option operates when the routing switch is config-
ured 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 informa-
tion, refer to
“Validation of Server Response Packets” on page 3-56
.
3-59