Transcript Revolutionary IPv6 Access Solution

Revolutionary IPv6 Access Solution
Levente Kovács
Authors: Cs. Lukovszki, L. Kovács, G. Kovács, A. Foglar, E. Areizaga, Z. Ghebretensaé
NOC, Berlin
BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
Budapest University of Technology and Economics
Overview

The concept


The PF entity


Switching frames on the information found in the IPv6 header, Most notably, the
IPv6 address
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 — 2
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
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Highly evolved
 Cheap equipments


IPv6 in Ethernet results big overhead
Lavish space utilization
WPC1 — 3
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 — 4
MUSE/SPC CONFIDENTAL
Budapest University of Technology and Economics
The Revolutionary node

Ethernet Switches (ESC) which
implements
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Bridging
 VLAN

Port Function (PF)
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Interfaces IPv6 traffic to the ESC
L2 framing on the transmission
links can be thin

Bridging is based on IPv6
WPC1 — 5
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 — 6
MUSE/SPC CONFIDENTAL
Budapest University of Technology and Economics
Address translation methods - so far

Type A


The network ID is used
Type B
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The interface/HOST ID is
used
WPC1 — 7
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 — 8
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
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When both address is known at the ESC there will be
no flood
HOST A MAC
address is
registered
flooding is
stopped
X
HOST A
X
WPC1 — 9
HOST A
HOST B
ESC
PF
HOST D
HOST B
HOST C MAC
address is
registered
ESC
PF
PF
Revolutionary
Node
HOST C
HOST D
MUSE/SPC CONFIDENTAL
PF
Revolutionary
Node
HOST C
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
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What the ESC should do?



Flooding to all
Discard
Other scenario to come
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HOST A
MAC-A
HOST B
MAC-B
PF
HOST C
MAC-C
MUSE/SPC CONFIDENTAL
PF
HOST D
MAC-B
Budapest University of Technology and Economics
Applicability in the MUSE architecture

Consists of following parts
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First-mile
 Aggregation network
 Regional/Core network
 Services network

Application
Service
Provider
Home
Network
Home
Gateway
Aggregation network

Ethernet-based aggregation
 Single connected
 Dual homing (for protection)
WPC1 — 11
First-Mile
Access
Node
Access
Node
MUSE/SPC CONFIDENTAL
NSP Edge
Node
NAP Edge
Node
Internet
ISP Edge
Node
NAP Edge
IP/MPLS
Node
Regional
Network
Ethernet
Aggregation
Network
Budapest University of Technology and Economics
Applicability in the aggregation
Ethernet Aggregation Network

Large, distributed, managed
Ethernet network

That forwards IPv6 packets

Without routers, but Ethernet
switches
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PFs are on the borders
Ethernet
Switches
NAP
Edge Node
Access Node
NAP
Edge Node
Access Node
ESC
ESC
Ingress PF
AAL
DSLAMs
 ENs
Egress PF
Revolutionary model of aggregation network
PF
ESC ESC ESC ESC
IPv6
Eth

Eth
Phy
ATM
Eth
P P
Eth
P P
Eth
P P
Eth
P P
PF
ESC
Eth
P P
IPv6
Eth Eth
Phy Phy

Result

IP managed Ethernet forwarding
DSL
WPC1 — 12
MUSE/SPC CONFIDENTAL
Budapest University of Technology and Economics
Conclusions

Cost effective
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Cheap Ethernet switches used
 No need to invest expensive equipments
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Scalable
Flexible
Manageable

VLANs
 PFs can be controlled from the network
WPC1 — 13
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 — 14
MUSE/SPC CONFIDENTAL
Budapest University of Technology and Economics
Any question?
Thank you for your attention!
[email protected]
WPC1 — 15
MUSE/SPC CONFIDENTAL
Budapest University of Technology and Economics