Transcript Broadband Access Network

Rethinking Access Networks with
High Performance
Virtual Software BRASes
Roberto Bifulco, Thomas Dietz, Felipe Huici, Mohamed Ahmed,
Joao Martins, Saverio Niccolini, Hans-Joerg Kolbe
[email protected]
NEC Europe Ltd.,
NEC Laboratories Europe
Heidelberg, Germany
Acknowledgements
▐ NEC Laboratories Europe, Heidelberg, Germany
▐ The work has been partially funded by the European FP-7 projects
Broadband Access Network
subscribers
HGW
DC
services
DSLAM
EDGE
ROUTER
HGW
BRAS
HGW
HGW
DSLAM
IP
PPP
PPPoE
Ethernet+VLAN
IP
Ethernet
SDH/PDH (DSL)
SDH, WDM, ….
aggregation network
core network (IP)
Internet
Broadband Access Network
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PPPoE/PPP sessions management
Header encapsulation/decapsulation
Interface to AAA
Traffic shaping
Access control
ARP proxy
IP Forwarding
IP addresses assignment
IGMP processing
Broadband Access Network
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PPPoE/PPP sessions management
Header encapsulation/decapsulation
Interface to AAA  Expensive
Traffic shaping  Monolithic architecture
Access control  Single point of failure
 Hard to change
ARP proxy
IP Forwarding
IP addresses assignment
IGMP processing
Network Function Virtualization
▐ Decouple Network Functions from the hardware that provides
them!
VM
Network Function Virtualization
▐ From Hardware to Software
 Do we need to maintain the same monolithic approach?
▐ Server virtualization technologies are IT-oriented
 Network functions require optimized I/O
Network Function Virtualization
▐ From Hardware to Software
 Do we need to maintain the same monolithic approach?
▐ Server virtualization technologies are IT-oriented
 Network functions require optimized I/O
Tiny, Fast VMs
Fast
SOFTWARE
VSWITCH
Fast I/O
Fast I/O
Modular Network Functions
▐ Exploit successful approaches:
 The Click Modular Router
Element
Putting all together: ClickOS
[1] Netmap: http://info.iet.unipi.it/~luigi/papers/20120503-netmap-atc12.pdf
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© NEC Corporation 2013
WTF?
What’s The Function?
BRAS on ClickOS
An early performance
EVALUATION
ClickOS: VNF instantiation
▐ Cut of VM boot time down to less than 30 msec
 Up to 200 msec when running 400 VMs on a single PC
▐ Instantaneous processing of middlebox functions
 ~20 msec when several VMs are already running
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© NEC Corporation 2013
all measurements made on a
single PC, Intel i7, 3,2GHz, 6
cores, 4GB RAM
Networking performance with 128 VMs
all measurements made on a
single PC, Intel i7, 3,2GHz, 6
cores, 4GB RAM
▐ Line rate (10 Gbps) for all packet sizes (256 bytes and greater)
 4.8 Mpps for 64 bytes packets
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© NEC Corporation 2013
all measurements made on a
single PC, Intel i7, 3,2GHz, 6
cores, 4GB RAM
PPP Control Plane
▐ Session setup rates
 Reached >1000 sessions/s
• Current BRAS technology reaches about 300s/s
• Same result with multiple (up to 25) VMs on the same server
 Not able to measure further because of limitations of test equipment
* ACK: Thanks to Xantaro Gmbh and Carsten Michel for the test-bed setup
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© NEC Corporation 2013
Evaluation (summary)
▐ Linux VM performance (without any network function)
 ~1% of 10Gbps for 256B packets
 ~1-10 sec boot time
 several MB memory footprint (hundreds..)
▐ ClickOS performance
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100% of 10Gbps for all packet sizes bigger than 256B (100x faster)
~30 msec boot time (30x faster)
5 MB memory footprint (at least 10x smaller)
Able to run hundreds VMs on a single PC
▐ PPP control plane
 Session establishment rate: >1000 sessions/s
 Memory requirement: 1MB to support 1000 sessions
▐ PPP data plane
 100% of 10Gbps for all packet sizes bigger than 512B
Conclusion
▐ We introduced ClickOS, an innovative technology to build VNF
▐ We built a BRAS VNF based on ClickOS
▐ We provided a early performance evaluation of our prototype
 100% of 10Gbps for all packet sizes bigger than 256B for plain
ClickOS
 100% of 10Gbps for all packet sizes bigger than 512B for PPP data
plane
 ~30 msec boot time (30x faster)
 5 MB memory footprint (at least 10x smaller)
 Able to run hundreds VMs on a single PC
 Session establishment rate: >1000 sessions/s
 Memory requirement: 1MB to support 1000 sessions
▐ …
Future work
▐ We shown how to decompose network functions, in order to
enable a new way of composing them again!!
PPP decapsulation
PPPoE
IPoE
PPPoE
Controller
Subscribers
HGW
DSLAM
PPP termination
HGW
HGW
▐ An enabler to build Service Chains
▐ There is still room for performance optimizations
▐ Standard activities
 ETSI NFV, …