H3C Implementation Of Option 18 And Option 37; Option 18 For Dhcpv6 Snooping - H3C MSR 2600 Configuration Manual

Figure 89 Trusted and untrusted ports

H3C implementation of Option 18 and Option 37

Option 18 for DHCPv6 snooping

Option 18, also called the interface-ID option, is used by the DHCPv6 relay agent to determine the
interface to use to forward RELAY-REPLY message.
In H3C implementation, the DHCPv6 snooping device adds Option 18 to the received DHCPv6 request
message before forwarding it to the DHCPv6 server. The server then assigns IP address to the client
based on the client information in Option 18.
Figure 90 Option 18 format
Figure 90 shows the Option 18 fields:
Option code—Option code.
•
• Option length—Size of the option data.
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.
•
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