BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS Budapest University of Technology and Economics Revolutionary IPv6 Access Solution Levente Kovács Authors: Cs. Lukovszki, L. Kovács, G. Kovács, A. Foglar, E. Areizaga, Z. Ghebretensaé NOC, Berlin

WPC1 — 2 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Overview  The concept  Switching frames on the information found in the IPv6 header, Most notably, the IPv6 address  The PF entity  The entity which interfaces the Ethernet switch and the Layer-2 independent IPv6 traffic  Problems  Flooding  MAC collision  Solutions  Filtering on the outputs  Benefits  Wait and see!

WPC1 — 3 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics IPv6 in Ethernet frame  IPv6 has a large address space  128bits  Ethernet is very common in access  Highly evolved  Cheap equipments  IPv6 in Ethernet results big overhead  Lavish space utilization

WPC1 — 4 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics The Revolutionary concept  IPv6 address fields contains all the relevant information for layer-2 packet forwarding  EUI Interface ID, Network ID, or other fields of the IPv6 header Ethernet header can be eliminated over the transmission links

WPC1 — 5 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics The Revolutionary node  Ethernet Switches (ESC) which implements  Bridging  VLAN  Port Function (PF)  Interfaces IPv6 traffic to the ESC  L2 framing on the transmission links can be thin  Bridging is based on IPv6

WPC1 — 6 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Address translation  Address translation IPv6->MAC  128->48 mapping  Different slice of the IPv6 address could be used for mapping  Host ID  MAC address from the EUI field of IPv6  Network ID  Acts as a router  Mixed  Others may come  Keeping in mind the rules of MAC addresses in IEEE802.3  Multicast addresses should be translated to multicast Ethernet addresses

WPC1 — 7 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Address translation methods - so far  Type A  The network ID is used  Type B  The interface/HOST ID is used

WPC1 — 8 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Problems  ESC can flood in learning state  A frame with unknown MACs arrives to the ESC  The ESC does not know the appropriate destination port(s)  ESC will send the frame to all its ports (flooding)  The whole network can be flooded  MAC collision  From different source addresses the same MACs are generated

WPC1 — 9 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Flood detection and elimination  The ESC floods when a frame first arrives  PFs must detect, and ignore this kind of frames  When both address is known at the ESC there will be no flood

WPC1 — 10 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics MAC address collision  The generated MAC addresses generated in different methods, thus it's not guaranteed by the system to generate unique pseudo MACs  Only a problem If the same MAC is generated for more then one host connected to the same node  What the ESC should do?  Flooding to all  Discard  Other scenario to come

WPC1 — 11 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Applicability in the MUSE architecture  Consists of following parts  First-mile  Aggregation network  Regional/Core network  Services network  Aggregation network  Ethernet-based aggregation  Single connected  Dual homing (for protection)

WPC1 — 12 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Applicability in the aggregation  Large, distributed, managed Ethernet network  That forwards IPv6 packets  Without routers, but Ethernet switches  PFs are on the borders  DSLAMs  ENs  Result  IP managed Ethernet forwarding

WPC1 — 13 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Conclusions  Cost effective  Cheap Ethernet switches used  No need to invest expensive equipments  Scalable  Flexible  Manageable  VLANs  PFs can be controlled from the network

WPC1 — 14 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Benefits  Overhead on the access links can be reduced (this is the main backward of IPv6)  Existing infrastructure can be reused

WPC1 — 15 MUSE/SPC CONFIDENTAL Budapest University of Technology and Economics Any question? Thank you for your attention!