1. Backbone Router PlugFest demo
draft-thubert-6lowpan-backbone-router
draft-chakrabarti-nordmark-6man-efficient-nd
Pascal Thubert & Thomas Watteyne
6lo WG Meeting
89th IETF Meeting
London

2. Tomorrow’s meetings of interest
GMT Thursday Morning extra session
Meeting Room tisch PlugFest
GMT Thursday Afternoon Session I
Buckingham INT 6tisch IPv6 over the TSCH mode of
IEEE e
GMT Thursday Afternoon Session II
Viscount RTG roll Routing Over Low power and
Lossy networks
GMT Friday Afternoon Session 1
Viscount APP core Constrained RESTful Environments 2 2 2

3. 6TiSCH: Architecture RPL Authentication for Network Access
Centralized route and track computation and installation
Management and Setup
Discovery
Pub/Sub
Authentication for Network Access 
Distributed route and track computation and installation
Distributed route and track computation and installation
Backbone Router (proxy)
PCEP/PCE
CoAP/DTLS
PANA
6LoWPAN ND
RPL
Time Slot scheduling and track G-MPLS forwarding
TCP
UDP
ICMP
RSVP
IPv6
6LoWPAN HC
6top
IEEE e TSCH 3

4. (SmartMesh IP starter kit)
Backbone router demo
IPv6 host
draft-thubert-6lowpan-backbone-router
efficient ND (WiND) (IPv6 ND suppress)
host
Ethernet
Ethernet
SmartMesh IP
IEEE e TSCH
6LoWPAN
Cisco IE3000
(industrial switch)
bridge
serial
DustLink
6LoWPAN compaction
interface to manager ND
Linear Technology DC9000
(SmartMesh IP starter kit)
Classical ND
Efficient ND
SmartMesh IP

5. LP Node 6LR 6LBR 6BBR Router/Server Router/Server Router/Server
Ethernet
Mesh
Radio 1 Hop
Ethernet
6LoWPAN ND
Route over or
Mesh under
Efficient ND
Classical ND
NS (ARO)
Route update
NS (ARO)
NS (ARO)
NS DAD
Create proxy state
NS lookup
NA (~O)

6. What’s a Backbone Router?
Common ND based abstraction over a backbone
Scales DAD operations (distributes 6LoWPAN ND LBR)
Scales the subnetwork (high speed backbone)
Allows interaction with nodes on the backbone or in other subnets running different operations

7. Questions?

8. Initial time ---+---------------------- | External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
(root) (6LBR)
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o

9. Initial time A single subnet model for the backbone and the
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
A single subnet model
for the backbone and the
wireless sensor networks
Default
Route
In RIB
Subnet
Route
In RIB
Subnet
Route
In RIB
Subnet
Route
In RIB
Subnet
Route
In RIB
Subnet
Route
In RIB

10. Registration (1st step)
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
(6LBR) (6LBR)
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
Registration has:
Lifetime
Unique ID
TID (SeqNum)
DAD
DAD NS
(ARO)
DAR

11. Registration (2nd step one second later)
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
(6LBR) (6LBR)
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
The BR maintains
a binding state
to the WSN node
for the registration
lifetime
Opt NA(O)
Opt NA(O) NA
(ARO)
DAC

12. Duplication DAD option has: Unique ID TID (SeqNum) Defend with NA if:
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
(root) (6LBR)
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
DAD option has:
Unique ID
TID (SeqNum)
Defend with NA if:
Different OUID
Newer TID
DAD NA
DAC
(KO)
DAR

13. Mobility DAD option has: Unique ID TID (SeqNum) Defend with NA if:
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
DAD option has:
Unique ID
TID (SeqNum)
Defend with NA if:
Different OUID
Newer TID
NOT Available Yet
DAD NA
DAC
(OK)
DAR

14. Resolution NA option has: Unique ID TID (SeqNum) NA NS packet
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
NA option has:
Unique ID
TID (SeqNum) NA NS
packet

15. Resolution (2) packet NS NA ---+----------------------
| External Network |
| | Router | | PCE/
| | | | NME
| |
| Subnet backbone |
| | |
| | Backbone | | Backbone | | Backbone
| | router | | router | | router
o o o o o o
o o o o o o o o o o o o o o
o o o o o o o o o o o o o o o
o o o o o o o o o o
o o o o o o o
packet NS NA

16. Enhancing the Address Registration Option
Used to resolve conflicts
Added in Efficient ND: TID to detect movement
Needed In RPL: Object Unique ID if use RPL for DAD
| Type | Length = 2 | Status | Reserved |
| Reserved |T| TID | Registration Lifetime |
| |
Unique Interface Identifier