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Network Virtualization – a view from the bottom
Jorge Carapinha, PT Inovação
Javier Jimenez, Telefonica I+D
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona
• Minimizing cost of ownership
• New revenues
– Reselling infrastructure to 3rd parties
– “Next-generation” managed services
• Flexible deployment of new technologies
Why NV matters to operators
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 2
• Technology diversity instead of “one size fits all”
solution (as advocated by today’s IP-based
convergence)
• From the user (VPN customer) standpoint, […] the VR [must] be as
equivalent to a physical router as possible. In other words, with very
minor and very few exceptions, the VR should appear for all purposes
(configuration, management, monitoring, troubleshooting) like a
dedicated physical router.
• A VR […] simply has to provide the illusion that a dedicated router is
available to satisfy the needs of the network(s) to which it is
NV 1st wave – Virtual Routers
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 3
available to satisfy the needs of the network(s) to which it is
connected.
[RFC2917 - A Core MPLS IP VPN Architecture, September 2000]
Building VR-based VPNs
VPN A
VPN A
VPN B
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 4
VPN A
VPN B
VPN C
VPN C
Virtual link
L3 VPN: RFC 4364 model (BGP/MPLS VPN)
VRF
VRF
VRF
VRF
CE
siteCE
site
MP-BGP
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 5
PE PEP
VRF VRF
CE
siteCE
site
customers VPN service providercustomers
P
Network Virtualisation – general overview
Virtual Network n
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 6
Physical network
Virtual Network 2
Virtual Network 1
4WARD Network Virtualisation business
model
Virtual Network
Virtual Network
Operator (VNO)
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 7
Virtual Network
Provider (VNP)
Physical
Infrastructure
Provider (InP)
Physical
Infrastructure
Provider (InP)
Physical
Infrastructure
Provider (InP)
Types of substrate nodes
Network domain
Other domains
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 8
Edge nodeCore VN-
capable node
Core transport
nodeBorder node
• Scalability
• Efficient and dynamic resource management
• Seamless VN / infrastructure separation
• Strict inter-VN isolation
Network Virtualisation key challenges
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 9
• Node scalability (# of VNs per physical node)
• Global architecture scalability
– State information maintained in core nodes
– Virtual link aggregation favours separation of
transport and virtualized nodes
– Trade-off between fine-grained resource control (VN
Scalability
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 10
– Trade-off between fine-grained resource control (VN
isolation) and link aggregation (scalability)
Resource management
aF
A
B
C
D E
F
G
Hl
A
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 11
Physical link
Virtual link
C
D
G
H
E
b
c
d
e
f
g
h
i
j
k
m
n
o
p
B
Seamless VN/infrastructure separation
Virtual Network
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 12
Physical Network 1 Physical Network 2
Virtual Network isolation
Virtual Network 1
Virtual Network 2
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 13
Physical network
Virtual Network 1
• Network virtualization is a promising concept for
operators in several contexts and scenarios
• VPNs can be seen as precursors of full-blown network
virtualization and should provide useful lessons
• Issues to be faced before network virtualization can be
deployed in large scale commercial scenarios
Conclusions
ACM SIGCOMM VISA’2009 Workshop, 17/08/09, Barcelona 14
deployed in large scale commercial scenarios
– Scalability
– Resource management
– VN / infrastructure separation
– VN isolation.