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Configure DHCPv6 snooping Option18/37

The DHCPv6 snooping function supports Option18 and Option37. Option18 and Option37 both support the default filling format and extended filling format.

Configuration Condition

Before configuring the DHCP snooping Option18 and Option37, first complete the following task:

  • Enable the DHCPv6 snooping function

Configure Option18

The content of Interface ID includes default filling format and extended filling format. The default content filling format of Interface ID is as follows:

The default content filling format of Interface ID

Figure 8-1 The default content filling format of Interface ID

The extended filling format needs the filling format to be configured to take effect in the user configuration format. The extended filling format of Interface ID is as follows:

The extended filling format of Interface ID

Figure 8-2 The extended filling format of Interface ID

Table 8-6 Configure Option18

Step

Command

Description

Enter global configuration mode

configure terminal

-

Enter the L2 Ethernet interface configuration mode

interface interface-name

Either

After entering the L2 Ethernet interface configuration mode, the subsequent configuration just takes effect on the current port. After entering the aggregation group configuration mode, the subsequent configuration just takes effect on the aggregation group.

Enter the aggregation group configuration mode

interface link-aggregation link-aggregation-id

Enable Option18 function

ipv6 dhcp snooping option interface-id enable

Mandatory

By default, Option18 is disabled.

Configure the content of Interface ID

ipv6 dhcp snooping option format interface-id string

Optional

By default, the Interface ID content in Option18 is interface id – duid format.

Configure Option37

The content of Remote ID includes default filling format and extended filling format. The default content filling format of Remote ID is as follows:

The default content filling format of Remote ID

Figure 8-3 The default content filling format of Remote ID

The extended filling format needs the filling format to be configured to take effect in the user configuration format. The extended filling format of Remote ID is as follows:

The non-default content filling format of Remote ID
Figure 8-4 The non-default content filling format of Remote ID

Table 8-7 Configure Option37

Step

Command

Description

Enter global configuration mode

configure terminal

-

Enter the L2 Ethernet interface configuration mode

interface interface-name

Either

After entering the L2 Ethernet interface configuration mode, the subsequent configuration just takes effect on the current port. After entering the aggregation group configuration mode, the subsequent configuration just takes effect on the aggregation group.

Enter the aggregation group configuration mode

interface link-aggregation link-aggregation-id

Enable Option37 function

ipv6 dhcp snooping option remote-id enable

Mandatory

By default, the Option37 function is disabled.

Configure the content of Remote ID

ipv6 dhcp snooping option format remote-id { string | hostname }

Mandatory

By default, the Remote ID content in Option37 is enterprise num - interface id –duid format.

Configure the Processing Policy of Option18/37 Packet

After configuring the processing policy of the Option18/37 packet, you can adopt different processing policies for the DHCPv6 request packet with Option18/37.

Table 8-8 Configure the processing policy of the Option18/37 packet

Step

Command

Description

Enter global configuration mode

configure terminal

-

Enter the L2 Ethernet interface configuration mode

interface interface-name

Either

After entering the L2 Ethernet interface configuration mode, the subsequent configuration just takes effect on the current port. After entering the aggregation group configuration mode, the subsequent configuration just takes effect on the aggregation group.

Enter the aggregation group configuration mode

interface link-aggregation link-aggregation-id

Configure the processing policy of the Option18/37 packet

ipv6 dhcp snooping option policy replace

Mandatory

By default, do not replace the Option18/37 content in the DHCPv6 request packet.