Accurate(yetlong(winded(1tle:( Exposing(network,(VMedge(and( … · 2018. 7. 27. ·...

Accurate yet long winded 1tle:

Exposing network, VM edge and power topology via LLDP and BGP-‐

LinkState -‐-‐ and possible implica1ons

5/23/13 BField / Comcast (NANOG June 2013)

Brian Field / Comcast

1

Applying web principles to the network

[control plane focus]

Brian Field / Comcast

5/23/13 BField / Comcast (NANOG June 2013) 2

Conway’s Law •  “Any organiza+on that designs a system (defined broadly) will produce a design whose structure is a copy of the organiza+on's communica+on structure.”

•  What does this mean? –  Think Reese’s peanut buEer cups–chocolate and peanut buEer – two great tastes that taste great together

–  Conway’s law would suggest org structures hamper crea+on of Reese’s peanut buEer cups


What has made the web so successful?

–  HTTP – open –  Apache – open source –  Linux– open source –  COTS hw – cheap


HTTP

Apache

Linux

COTS hw

Web stack4

Web model versus router model


HTTP

Apache

Linux

COTS hw

BGP, ISIS, PIM, etc.

Proprietary CLI

Proprietry OS/chassis

Proprietary ASICs

Web stack Router stack 5

Is this SDN?

•  “open” API

•  manage (“hide”) proprietary router environment

•  Can we do be`er?


HTTP

Apache

Linux

COTS hw


Proprietary CLI


Proprietary ASICs

SDN APIs

Web stack Router stack

6

Service Providers and virtualiza1on •  Virtualiza1on

–  COTS hw –  Many servers, many

loca1ons

•  Apps as VMs

•  App could run across mul1ple CPs (cloud providers)

•  Agility


Router

VM-X

VM-Y

PS-1

PS-2

PDU-42

PDU-43

powercords

Virtualizationservers

networklinks

VM-Y

VM-Z

PS-1

PS-2

powerdistribution

units

Applying applica1on thinking to the network

1.  Router VM in every COTS hw virtualiza1on

server

2.  Rethink how we build/encode network control informa1on

3.  Bigdata thinking applied to network–per web transac1on mining -‐> per packet mining


Background to Rethinking how we build/encode network control informa1on

•  Network/Ops: – What App/VMs are really running in site X right now?

•  Facility: – Not all sites and servers are iden1cally configured power-‐wise

•  Applica1on: – Are my VMs running in an environment that has sufficient network/server/power redundancy?

BField / Comcast (NANOG June 2013) 5/28/13 9

Three infrastructure topologies related to cloud applica1ons

1.  Network topology 2.  VM “edge” topology 3.  “power” topology

•  Who owns audi1ng these topologies? – What if my app spans mul1ple cloud providers?


Who owns audi1ng these topologies?

•  Past: –  Some org or the network folks

•  This isn’t a Comcast problem, this isn’t a cloud provider problem this is an applica1on problem

•  Put audi1ng onus on the apps

Ø It’s hard to audit info that is dynamic and isn’t learned in real-‐+me


How do we dynamically expose these infrastructure topologies?

•  IGP •  LLDP •  BGP LinkState


Two key protocols

•  BGP LinkState –  New AF –  Export IGP and TE state north bound

–  Part of IETF I2RS WG –  dral-‐iem-‐idr-‐ls-‐distribu1on-‐02

•  LLDP –  Link Layer Discovery Protocol

–  TLV based ethernet protocol

–  Supported in linux and recent router code


Step 1: Expose network topology


Network

Router

BGP

Link S

tate

route reflector

BGP Link State

Tools, Apps

Router

IGP

VM-X

VM-Y

real-time network state

PS-1

PS-2

PDU-42

PDU-43

powercords


networklinks

VM-Y

VM-Z

PS-1

PS-2

powerdistribution

units

Step 2: Expose VM edge topology


Network

Router

BGP

Link S

tate

route reflector

BGP Link State

Tools, Apps

Router

IGP

VM-X

VM-YLLDP


real-time VM state

PS-1

PS-2

PDU-42

PDU-43

powercords


networklinks

VM-Y

VM-Z

LLDP

LLDPPS-1

PS-2

powerdistribution

units

LLDP

Step 3: Expose power topology


Network

Router

BGP

Link S

tate

route reflector

BGP Link State

Tools, Apps

Router

IGP

VM-X

VM-YLLDP


real-time VM state

PS-1

PS-2

PDU-42

PDU-43

LLDP

real-time power-server state

powercords


networklinks

VM-Y

VM-Z

LLDP

LLDPPS-1

PS-2

LLDP

LLDP

powerdistribution

units

LLDP

LLDP

LLDP

LLDP

What are we lel with?

•  A real-‐1me database of: – Where all services are running

–  App/VM-‐>server-‐>router interface mapping

–  PDU-‐>Power Supply-‐>server mapping

•  Applica1on Value: –  Be`er VM placement –  Enable app audi1ng

RouterB

GP

Link

Sta

te

route reflector

BGP Link State

Tools, Apps


real-time VM statereal-time power-server state


Lots more info to encode into BGP LinkState

•  Encode this new informa1on in bits/bytes? •  Is it 1me to think about something a bit more current?

•  Like XML/JSON? – Hey, the web guys developed and use that stuff don’t they?

– Aren’t they pre`y successful at what they do?


Web thinking applied to network control protocols -‐> Make BGP RESTful

•  Proposal: –  Encode BGP LinkState using XML/JSON –  Convert BGP LinkState primi1ves to be RESTful

•  Result: –  BGP LinkState operates like a web app

•  Apply web’s solware methodology, scale and efficiency in the network control protocol space.

•  Does this apply to the IGPs too?


Remember I men1oned router VMs?


Network

Router

BGP

Link State

route reflector

BGP Link State

Tools, Apps

Router

IGP

VM-XVM-Y


real-time VM state

PS-1

PS-2

PDU-42

PDU-43

LLDP

real-time power-server state

powercords


networklinks

LLDP

powerdistribution

units

router VM

IGPLLDP

LLD

PLLDP

Open source router code!

LLDP

Which is be`er?

•  Virtualiza1on applied to rou1ng is the evolu1onary 1pping point in the network space

•  open API (SDN) vs. open source (router VM)



open source router code

Linux

COTS hw

Router VM stack


Proprietary CLI


Proprietary ASICs

SDN APIs

SDN Router stack

Applying web principles to the network [making peanut bu`er cups]

Thanks! [email protected]


Accurate(yetlong(winded(1tle:( Exposing(network,(VMedge(and( … · 2018. 7. 27. ·...

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Transcript of Accurate(yetlong(winded(1tle:( Exposing(network,(VMedge(and( … · 2018. 7. 27. ·...