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DHCP Vendor IDs
Add support to automatically map LAN interfaces using DHCP vendor ID (option 60).
The local DHCP server will forward these types of requests to a remote DHCP server.
For example, imagine there are 4 PVCs (0/33, 0/36, 0/37, 0/38), VPI/VCI=0/33 is
for PPPoE while the other PVCs are for IP set-top box use, and the LAN interfaces are
ENET1, ENET2, ENET3, and ENET4. The Interface Grouping configuration will be:
1. Default: ENET1, ENET2, ENET3, and ENET4.
2. Video: nas_0_36, nas_0_37, and nas_0_38. The DHCP vendor ID is "Video".
The local DHCP server is running on "Default" and the remote DHCP server is
running on PVC 0/36 (i.e. for set-top box use only). LAN side clients can get IP
addresses from the CPE's DHCP server and access the Internet via PPPoE (0/33).
If a set-top box is connected to ENET1 and sends a DHCP request with vendor ID
"Video", the local DHCP server will forward this request to the remote DHCP server.
The Interface Grouping configuration will automatically change to the following:
1. Default: ENET2, ENET3, and ENET4.
2. Video: nas_0_36, nas_0_37, nas_0_38, and ENET1.
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