F01: Sub-option type (1 means circuit ID).
F02: Length.
F03: Character ‘E’.
F04: Character ‘t’.
F05: Character ‘h’.
F06: Character ‘e’.
F07: Character ‘r’.
F08: Character ‘n’.
F09: Character ‘e’.
F10: Character ‘t’.
F11: Chassis ID. The number of the chassis. For stand-alone devices, the chassis ID will
always be 1. For stacked devices, the chassis ID will be the unit ID.
F12: Slash (/).
F13: ASCII format string ‘0’.
F14: Slash (/).
F15: Port number. The incoming port number DHCP client packets. ASCII format string.
F16: Colon (:)
F17: ‘cvlan’ is the client’s VLAN ID. The value ranges from 1 to 4094. ASCII format string.
F18: Dot (.).
F19: ASCII format string ‘0’.
F20: Space.
F21: System name of the Switch. NOTE: If the System name exceeds 128 bytes, it will
only use the first 128 bytes.
F22: Slash (/).
F23: ASCII format string ‘0’.
F24: Slash (/).
F25: ASCII format string ‘0’.
F26: Slash (/).
F27: Chassis ID. This value is the same as F11.
F28: Slash (/).
F29: ASCII format string ‘0’.
F30: Slash (/).