DHCPv6 snooping support for Option 37

Option 37, also called the remote-ID option, is used to identify the client.

The DHCPv6 snooping device adds Option 37 to the received DHCPv6 request message before forwarding it to the DHCPv6 server. This option provides client information about address allocation.

Figure 83 shows the Option 37 format, which includes the following fields:

• Option code—Option code.

• Option length—Size of the option data.

• Enterprise number—Enterprise number.

• Port index—Port that receives the DHCPv6 request from the client.

• VLAN ID—ID of the outer VLAN.

• Second VLAN ID—ID of the inner VLAN.

• DUID—DUID of the DHCPv6 client.

	NOTE: The Second VLAN ID field is optional. If the received DHCPv6 request does not contain a second VLAN, Option 37 also does not contain it.