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BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
Budapest University of Technology and Economics
Revolutionary IPv6 Access Solution
Levente KovácsAuthors: Cs. Lukovszki, L. Kovács, G. Kovács, A. Foglar, E. Areizaga, Z. Ghebretensaé
NOC, Berlin
WPC1 — 2 MUSE/SPC CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest 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
ESC
PF PF
Revolutionary Node
HOST A HOST B
HOST CHOST D
HOST A MAC address is registered
ESC
PF PF
Revolutionary Node
HOST A HOST B
HOST CHOST D
X
X
flooding is stopped
HOST C MAC address is registered
WPC1 — 10 MUSE/SPC CONFIDENTALBudapest 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
HOST AMAC-A HOST B
MAC-B
HOST DMAC-BHOST C
MAC-C
PF PF
WPC1 — 11 MUSE/SPC CONFIDENTALBudapest University of Technology and Economics
Applicability in the MUSE architecture
NAP Edge Node
NAP Edge Node
Application ServiceProvider
ISP Edge Node
NSP Edge Node
Internet
HomeGateway
Access Node
Access Node
First-Mile
EthernetAggregation
Network
IP/MPLSRegional Network
Home Network
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 CONFIDENTALBudapest 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
Access Node
Access Node
ESC
ESC
Ingress PF Egress PF
IPv6
Eth Eth Eth
Phy PAAL
ATM
DSL
P
Eth
P P
Eth
P P
IPv6
Eth EthEth
PhyP P Phy
Eth
P P
Ethernet Aggregation Network
Ethernet Switches
NAP Edge Node
NAP Edge Node
PF PFESC ESC ESCESCESC
Revolutionary model of aggregation network
WPC1 — 13 MUSE/SPC CONFIDENTALBudapest 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 CONFIDENTALBudapest 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 CONFIDENTALBudapest University of Technology and Economics
Any question?
Thank you for your attention!
