Successfully Interconnecting Data Centers

Ronnie Scott

Technology Solutions Architect

Sept 2014

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The Intent

The Reality

Delivering On The Promise

Agenda

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Data Center B Data Center A

Layer 2 vs Layer 3 Interconnects Layer 3

Subnet A

10.0.1.0

Subnet B

10.0.2.0

IP Readdressing

Required

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Virtual Data Center

Layer 2 vs Layer 3 Interconnects Layer 2

Subnet A

10.0.1.0

Subnet A

10.0.1.0

NO IP Readdressing

Required

Tunnel

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Layer 1, 2, or 3 Transport

• Dark Fiber

• Lambda (CWDM / DWDM)

Layer 1 Transport

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• Cost

• Distance

• Optics

• Administration

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• MPLS (EoMPLS)

• Metro Ethernet

• Wireless

Layer 1, 2, or 3 Transport Layer 2 Transport

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• Latency

• Bandwidth

• Frame Size

• Spanning Tree

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• Any WAN Service

Layer 1, 2, or 3 Transport Layer 3 Transport

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• Latency

• Bandwidth

• Frame Size

• Tunneling

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Virtual Data Center

Multiple Site Meshes

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Spanning Tree

• Loop Flooding

• TCN Flooding

• Broadcast/ARP Flooding

• Slow Convergence Time

• Interface Blocking

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Virtual Data Center

Spanning Tree Example Network Flooding

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Split Brain

• Potential Data Corruption

• Incorrect DR Take Over

• Loss Of Network State

• Loss Of Application Tiers

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Virtual Data Center

Split Brain Example Data Inconsistency

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Branch 1 Branch 2

vPC

DC Edge

Internal DC Zone(s) DC Core VDC (Routed)

DC Aggregation Layer VDC

Compute Access Layer

FW CLUSTER

Entanglement

HOT vMotion!

in

in

out

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Asymmetric Routing

• Traffic Management

• Network Service State Issues

• Troubleshooting

• Latency/Performance

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Virtual Data Center

Assymetric Routing Example Loss Of State

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Branch

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Virtual Data Center

• Physically Diverse Paths

• Physically Separate Devices

• No Shared Fate Domain

Best Practice Dual Redundant and Diverse Paths

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Virtual Data Center

• VPC

• OTV

• VXLAN

Best Practice Avoid Spanning Tree

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• FabricPath

• NVGRE

• MPLS

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Virtual Data Center

• Broadcast Suppression

• ARP Filtering

Best Practice Contain Fault Domain

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• L2 Routing (ISIS)

• Gateway Management

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Symmetric Routing - Inbound

• Explicit Routes

• NAT / Gateway Devices

• LISP

• DNS

• IP Readdressing

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Symmetric Routing - Outbound

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• Weighted Routing

• Default Gateway Prioritization

• NAT / Gateway Devices

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Optimal Routing

• GSLB

• SLB Clustering

• FW Clustering

• LISP

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Virtual Data Center

Latency Ensuring Synchronization Completion

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• Storage Replication

• Application Synchronization

• Virtual Machine Migration

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Virtual Data Center

Jumbo Frames Ensuring Packet Delivery

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• No PMTUD

• No “Could Not Fragment”

• Dramatic IP Performance Degadation

101100110…

www.cisco.com/go/vmdc

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Thank you.