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11.DCI互连 Nexus Overlay Transport Virtualization (OTV)_v1.0

Nexus&Overlay&Transport&Virtualization& (OTV)

Victor

4th November

Objectives

!This&session&features&a&detailed&analysis&of&the&architectural&aspects&and& deployment&benefits&behind&OTV

!The&attendees&will&learn&how&OTV&is&aimed&at&providing&Layer&2&connectivity& beyond&the&Layer&3&boundary&while&maintaining&the&failure&containment&and& operational&simplicity&that&the&Layer&3&boundary&provides

!The&attendees&will&get&a&deep&knowledge&of&how&the&OTV&controlDplane&and& dataDplane&work&to&provide&the&VLAN&extension

2

Session-Non/objectives

!This&session&does¬&include:

!In&depth&discussion&of&Path&Optimization&technologies&(DNS,&LISP,&etc.)

!Storage&extension&considerations&associated&to&DCI&deployments

!Workload&mobility&application&specific&deployment&considerations

3

Agenda

!Distributed&Data&Centers:&Goals&and&Challenges

!OTV Technical Overview

!OTV&Architecture&Principles

!OTV&Design&Considerations&&&New&Features

5

Distributed-Data-Centers-Goals

!

Ensure&business&continuity !Distributed&applications !Seamless&workload&mobility&!Maximize&compute&resources

EoMPLS

VPLS Dark&Fiber Data-Center-Interconnect

Traditional&Layer&2&Extensions

!VSS&&&vPC&or&FabricPath

–Applies&easily&for&dual&site&interconnection –Over&dark&fiber&or&protected&DDWDM –Easy&crypto&using&endDtoDend&802.1AE

!OTV&–Overlay&Transport&Virtualization

–MAC&in&IP

!EoMPLS &&VPLS&&&ADVPLS&&&HDVPLS

–PE&style

–MultiDtenants

–Most&deployed&today

Ethernet

MPLS

IP

7

Flooding-Behavior

x 2

Site-A

Site-B

Site-C

MAC-1-propagation

MAC-1

!Traditional&Layer&2&VPN&technologies&rely&on&flooding&to&propagate&MAC&reachability !The&flooding&behavior&causes&failures&to&propagate&to&every&site&in&the&Layer&2&VPN

Our$goal…

Providing&layer&2&connectivity,&yet&restrict&the&reach&of&the&unknown&unicast&flooding&domain&in&order&to&contain&failures&and&preserve&the&resiliency

Pseudo/Wires-Maintenance-

!Before&any&learning&can&happen&a&full&mesh&of&pseudoDwires/

tunnels&must&be&in&place

!For&N&sites,&there&will&be&N*(N(1)/2pseudoDwires.&Complex&to&add&and&remove&sites

!HeadDend&replication&for&multicast&and&broadcast.&SubDoptimal&BW&utilization

Our$goal…$$providing&pointDtoDcloud&provisioning&and&optimal&bandwidth&

utilization&in&order&to&reduce&cost

8

9

Multi/homing

L2&Site

L2&Site L2&VPN

Activ e

Activ e

Our$goal…$natively&providing&automatic&detection&of&multiDhoming&without&the&need&

of&extending&the&STP domains,&together&with&a&more&efficient&loadDbalancing

!Requires&additional&protocols&(BGP,&ICC,&EEM)&!STP&often&extended !Malfunctions&impact&all&sites

Challenges-in-Traditional-Layer-2-VPNs

Unknown Unicast

for MAC propagation

Unicast Flooding reaches

11

OTV-Changes-the-Game

LAN-Extensions-Evolution:-Any-Workload,-Anytime,-Anywhere

!Full&mesh&of&circuits&(pseudoDwires)!MAC&learning&based&on&flooding !Tunnels&and&PseudoDwires&!Operationally&Challenging

Loop&prevention&and&multiDhoming&must&be&provided&separately

!Packet&switched&connectivity !MAC&learning&by&control&protocol !Dynamic&Encapsulation !Operational&simplification

Automatic&loop&prevention&&&multiD homing

B A

C

D B A C D

L2

L3Data-Center-II

Data-Center-I

Circuits Packet B A C D B A C D L2

L3Data-Center-II

Data-Center-I

Traditional&L2VPNs

MAC&Routing

+&Data&Plane&Flooding

+&Control&Protocol&Learning

Technology&Pillars

Multipoint&Connectivity

PointDtoDCloud&Model

Dynamic&Encapsulation

Preserve&Failure&Boundary

BuiltDin&Loop&Prevention

Automated&MultiDHoming

Site&Independence

Protocol&Learning

OTV-–Overlay-Transport-Virtualization

!Simplifying&Data&Center&Interconnect

?Nexus-7000First&platform&to&support&OTV&(since&5.0&NXOS&Release)

Agenda

!Distributed&Data&Centers:&Goals&and&Challenges

!OTV Technical Overview

–Control&Plane&and&Data&Plane

–Failure&Isolation

–MultiDhoming

–Mobility

–L2&Multicast&Forwarding

–QoS&and&Scalability

–Path&Optimization

!OTV&Architecture&Principles

!OTV&Design&Considerations&&&New&Features

Terminology

OTV&Devices&and&Interfaces

Core&Device

Aggregation&Device

OTV&Internal&

Interfaces

Terminology

OTV&Devices&and&Interfaces

Core&Device

Aggregation&Device

19

OTV-Control-Plane

!No-unknown-unicast-flooding-(selective-unicast-flooding-in-6.2)!Control-Plane-Learning-with-proactive-MAC-advertisement !Background&process&with&no&specific&configuration&!ISDIS&used&between&OTV&Edge&Devices

Building&the&MAC&Tables

West

OTV IP&A

IP&B

IP&C

East

South

MAC&Addresses Advertisements

OTV

OTV

OTV-Control-Plane

Neighbor&Discovery&and&Adjacency&Formation

!Before&any&MAC&address&can&be&advertised&the&OTV&Edge&Devices&must:?Discover&each&other

?Build&a&neighbor&relationship&with&each&other

!Neighbor&Relationship&built&over&a&transport&infrastructure:

?MulticastDenabled&(all&shipping&releases)

?UnicastDonly&(from&NXDOS&release&5.2&&&IOSDXE&3.9)

20

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