Configuring DHCP Snooping Relay Information Sub-options

You can configure DHCP relay agent sub-options such as the Subscriber ID (SID), Circuit ID (CID) or Remote ID (RID) options.

Enable DHCP snooping and DHCP option 82 on a VLAN.
```
device(config)# ip dhcp snooping vlan 1
```

Enter interface configuration mode for port 1/1/4.
```
device(config)# interface ethernet 1/1/4
```

Enable interface 1/1/4 to insert the SID, CID, or RID information in the DHCP packets.
```
device(config-if-e1000-1/1/4)# dhcp snooping relay information subscriber-id Brcd01
```
In the example, the SID is Brcd01.

The following example enables interface 1/1/4 to insert the CID information in the DHCP packets.

device(config-if-e1000-1/1/4)# dhcp snooping relay information circuit-id circuit01

The following example enables interface 1/1/4 to insert the RID information in the DHCP packets.

device(config-if-e1000-1/1/4)# dhcp snooping relay information remote-id remote01