Successfully Interconnecting Data Centers presentation for Cisco Connect Canada Tour 2014.

2. 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 BData 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

16. 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…

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37. Thank you.