Netgear Switch Discovery Protocol

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NTDS (Netgear Switch Discovery Protocol)
Communication protocol
PurposeNetgear level 2 switch management
Port(s)63321, 63322, 63323, 63324

Netgear Switch Discovery Protocol (NSDP) is a management protocol for several network device families, designed by Netgear.

Message structure[edit]

Common message header[edit]

Offset Length Meaning
0x0000 1 Proto version – always 0x01
0x0001 1 Operation code: may be 0x01 – read request, 0x02 – read response, 0x03 – write request, 0x04 – write response
0x0002 2 Operation result
0x0004 4 Unknown
0x0008 6 host MAC-address
0x000e 6 network device MAC-address (value 00:00:00:00:00:00 is used as multicast address, request will be proceeded by all devices, which would receive it)
0x0014 2 Unknown
0x0016 2 Sequence number (value increments with every next request)
0x0018 4 Protocol signature NSDP
0x001С 4 Unknown
0x0020 N Message body – the sequence of TLV records
0x0020 + N 4 End of message marker 0xFFFF0000

Message body record structure[edit]

Message body records are type–length–value (TLV) structures. Type field may be one of following values in the table(list in incomplete):

Type Meaning
0x0001 Device model
0x0003 Device given name
0x0004 Device MAC-address
0x0005 Device system location
0x0006 Device current IP-address (may be unsupported by certain devices)
0x0007 Device IP-network mask (may be unsupported by certain devices)
0x0008 Router IP-address (may be unsupported by certain devices)
0x000a administration password
0x000b DHCP Mode (Refresh DHCP = 2, DHCP = 1, Static = 0)
0x000d Device Firmware version slot 1 (may be unsupported by certain devices)
0x000e Device Firmware version slot 2 (may be unsupported by certain devices)
0x000f Next active firmware slot after reboot (01 = 1, 02 = 2, may be unsupported by certain devices)
0x0c00 Speed/link status of ports
0x1000 Port Traffic Statistic
0x2800 Get VLAN info
0x2c00 Delete VLAN (write only)

Protocol flow examples[edit]

Network devices discovery (MAC-address an device model discovery):

   Host with MAC=XX:XX:XX:XX:XX:XX from UDP-port 63321 or 63323 sending packet to broadcast IP-address and UDP-port 63322 or 63324
   Header    @0x00000000 0x01 0x01 0x000000000000 0xXXXXXXXXXXXX 0x000000000000 0x0000 0x0001 0x4E534450 0x00000000
   Body      @0x00000020 0x0001 0x0000 0x0004 0x0000
   Marker    @0x00000028 0xFFFF0000
   EACH Device responds with message like
   Header    @0x00000000 0x01 0x02 0x000000000000 0xXXXXXXXXXXXX 0xYYYYYYYYYYYY 0x0000 0x0001 0x4E534450 0x00000000
   Body      @0x00000020 0x0001 0x0028 0x47 0x53 0x31 0x30 0x35 0x45 0x20*0x22 0x0004 0x0006 0xYYYYYYYYYYYY
   Marker    @0x00000058 0xFFFF0000

Device support for protocol[edit]

  • GS105E ProSAFE Plus
  • GS108E ProSAFE Plus
  • GS724T
  • GS748T
  • FS116E (IP-network description and Firmware version TLVs are not supported)
  • FS726TP (uses 63323 and 63324 UDP-ports for interconnection)

Devices firmware update[edit]

Device firmware update is made with TFTP protocol, but you need to send NSDP request to turn on TFTP-server first.

See also[edit]

External links[edit]