DHCP Unique Identifier Content
 
 
  A 
DHCP unique identifier (DUID) consists of a
   two-octet type code followed by a variable number of octets that make up the actual identifier. A
   DUID can be no more than 128 octets long (not including the type code). The following types are
   currently defined: 
    - Link-layer address plus time
- Vendor-assigned unique ID based on Enterprise Number 
- Link-layer address 
ExtremeXOS uses Link-layer address plus time as its default client DUID. To
   configure DHCPv6 client identifier type for the client use:
  configure dhcp ipv6 client identifier-type [ link-layer |
    link-layer-plus-time | vendor-specific ]