H3C Technologies H3C S5560 Series Switches - Manual (Page 214)

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Figure 80 Option 37 format
Figure 80 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.
DHCPv6 snooping configuration task list
Tasks at a glance
(Required.) Configuring basic DHCPv6 snooping
(Optional.) Configuring Option 18 and Option 37
(Optional.) Configuring DHCPv6 snooping entry auto backup
(Optional.) Setting the maximum number of DHCPv6 snooping entries
(Optional. ) Configuring DHCPv6 packet rate limit
(Optional.) Enabling DHCPv6-REQUEST check
Configuring basic DHCPv6 snooping
Follow these guidelines when you configure basic DHCPv6 snooping:
• To make sure DHCPv6 clients can obtain valid IPv6 addresses, specify the ports connected to
authorized DHCPv6 servers as trusted ports. The trusted ports and the ports connected to DHCPv6
clients must be in the same VLAN.