H3c-technologies H3C WX6000 Series Access Controllers Uživatelský manuál stáhnout pdf (Strana 396)

100

101

38-3

Figure 38-2 Configure trusted ports in a cascaded network

DHCP Snooping Support for Option 82

Option 82 records the location information of the DHCP client. The administrator can locate the DHCP

client to further implement security control and accounting. For more information, refer to

Relay agent

option (Option 82)

If DHCP snooping supports Option 82, it will handle a client’s request according to the contents defined

in Option 82, if any. The handling strategies are described in the table below.

If a reply returned by the DHCP server contains Option 82, the DHCP snooping device will remove the

Option 82 before forwarding the reply to the client. If the reply contains no Option 82, it forwards it

directly.

If a client’s requesting

message has…

Handling

strategy

Padding

format

The DHCP snooping device will…

Drop Random Drop the message.

Keep Random Forward the message without changing Option 82.

normal

Forward the message after replacing the original

Option 82 with the Option 82 padded in normal

format.

Option 82

Replace

verbose

Forward the message after replacing the original

Option 82 with the Option 82 padded in verbose

format.

— normal

Forward the message after adding the Option 82

padded in normal format.

no Option 82

— verbose

Forward the message after adding the Option 82

padded in verbose format.

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