7.11 Hardware Refresh Strategy¶
7.11.1 Current Hardware Assessment¶
Existing Equipment Inventory¶
current_inventory:
wan_routers:
hub_sites:
mumbai:
device: "Cisco ASR 1002-HX"
quantity: 2
age: "4 years"
eos_date: "2026-06"
status: "Operational"
chennai:
device: "Cisco ASR 1001-X"
quantity: 1
age: "5 years"
eos_date: "2025-12"
status: "End of life approaching"
london:
device: "Cisco ISR 4451"
quantity: 1
age: "3 years"
eos_date: "2027-06"
status: "Operational"
newjersey:
device: "Cisco ISR 4451"
quantity: 1
age: "3 years"
eos_date: "2027-06"
status: "Operational"
branch_sites:
bangalore:
device: "Cisco ISR 4331"
quantity: 1
age: "4 years"
delhi:
device: "Cisco ISR 4321"
quantity: 1
age: "5 years"
noida:
device: "Cisco ISR 4321"
quantity: 1
age: "4 years"
frankfurt:
device: "Cisco ISR 4331"
quantity: 1
age: "3 years"
dallas:
device: "Cisco ISR 4331"
quantity: 1
age: "3 years"
Hardware Refresh Analysis¶
refresh_analysis:
decision_factors:
sd_wan_support:
factor: "Native SD-WAN capability"
current_state: "Legacy routers - limited SD-WAN support"
recommendation: "Replace with Catalyst 8000 series"
performance:
factor: "Throughput and feature capacity"
current_state: "Adequate for MPLS"
recommendation: "Upgrade for DIA + encryption overhead"
lifecycle:
factor: "Hardware end-of-life"
current_state: "Some devices approaching EoS"
recommendation: "Replace before EoS"
refresh_decision: "Full refresh to Catalyst 8000 series"
rationale:
- "Native SD-WAN support"
- "Higher throughput for encryption"
- "Consistent platform across sites"
- "Extended lifecycle"
7.11.2 Target Hardware Selection¶
WAN Edge Platform Selection¶
platform_selection:
hub_sites:
primary_choice: "Catalyst 8500-12X4QC"
rationale:
- "High throughput (40 Gbps)"
- "Multiple 10G/40G interfaces"
- "HA support"
- "Future growth capacity"
specifications:
throughput: "40 Gbps with services"
interfaces: "12x 10G SFP+, 4x 40G QSFP"
memory: "32 GB"
storage: "480 GB SSD"
power: "Dual AC/DC"
regional_branches:
primary_choice: "Catalyst 8300-2N2S-4T"
rationale:
- "Right-sized for branch"
- "Multiple WAN interfaces"
- "Cost-effective"
specifications:
throughput: "10 Gbps with services"
interfaces: "2x NIM, 4x 1G"
memory: "16 GB"
small_branches:
primary_choice: "Catalyst 8200L-1N-4T"
rationale:
- "Entry-level SD-WAN"
- "Compact form factor"
- "Cost-optimized"
specifications:
throughput: "2 Gbps with services"
interfaces: "4x 1G"
memory: "8 GB"
Hardware Bill of Materials¶
hardware_bom:
wan_edges:
c8500_12x4qc:
description: "Catalyst 8500-12X4QC"
quantity: 8
unit_price: 35000
total: 280000
deployment:
- "Mumbai Hub (2)"
- "Chennai Hub (2)"
- "London Hub (2)"
- "New Jersey Hub (2)"
c8300_2n2s_4t:
description: "Catalyst 8300-2N2S-4T"
quantity: 5
unit_price: 12000
total: 60000
deployment:
- "Bangalore (1)"
- "Delhi (1)"
- "Noida (1)"
- "Frankfurt (1)"
- "Dallas (1)"
accessories:
sfp_modules:
description: "10G SFP+ SR/LR"
quantity: 48
unit_price: 500
total: 24000
power_cables:
description: "Country-specific power cables"
quantity: 26
total: 1000
console_cables:
description: "USB console cables"
quantity: 13
total: 500
spare_inventory:
c8300_spare:
quantity: 1
purpose: "Branch replacement"
location: "Mumbai warehouse"
total_hardware: 365500
7.11.3 Legacy Equipment Disposition¶
Decommission Plan¶
decommission_plan:
timeline:
phase_1: "Branch routers - Week 16-18"
phase_2: "Hub routers - Week 19-22"
disposition_options:
trade_in:
partner: "Cisco"
program: "Cisco Refresh"
estimated_value: 25000
resale:
channel: "Authorized reseller"
estimated_value: 15000
internal_reuse:
purpose: "Lab equipment"
quantity: 2
recycling:
method: "Certified e-waste recycler"
compliance: "WEEE/RoHS"
data_sanitization:
requirement: "NIST 800-88 compliant"
method: "Configuration wipe + factory reset"
verification: "Documented attestation"
7.12 Circuit Migration Procedures¶
7.12.1 Circuit Inventory¶
Current Circuit Portfolio¶
circuit_inventory:
mpls_circuits:
provider: "Tata Communications"
contract_end: "June 2026"
total_monthly: 81000
circuits:
- id: "TATA-MUM-001"
site: "Mumbai"
type: "MPLS"
bandwidth: "1 Gbps"
monthly: 15000
status: "Active"
- id: "TATA-CHE-001"
site: "Chennai"
type: "MPLS"
bandwidth: "500 Mbps"
monthly: 9000
status: "Active"
# ... additional circuits
new_circuits:
internet_dia:
provider_primary: "Jio Business"
provider_secondary: "ACT Fibernet"
circuits:
- id: "JIO-MUM-001"
site: "Mumbai"
type: "Internet DIA"
bandwidth: "1 Gbps"
monthly: 2500
status: "Ordered"
- id: "ACT-CHE-001"
site: "Chennai"
type: "Internet DIA"
bandwidth: "500 Mbps"
monthly: 1500
status: "Ordered"
lte_backup:
provider: "Airtel Business"
type: "4G/5G"
monthly_per_site: 200
7.12.2 Circuit Provisioning¶
New Circuit Provisioning Process¶
circuit_provisioning:
timeline:
order_lead_time: "4-6 weeks"
installation: "1-2 weeks"
testing: "1 week"
process:
step_1:
name: "Requirements definition"
duration: "Week 1"
activities:
- "Define bandwidth requirements"
- "Specify SLA requirements"
- "Identify delivery locations"
step_2:
name: "RFQ and selection"
duration: "Week 2-3"
activities:
- "Issue RFQ to providers"
- "Evaluate proposals"
- "Select providers"
step_3:
name: "Contract and order"
duration: "Week 4"
activities:
- "Contract negotiation"
- "Place orders"
- "Confirm delivery dates"
step_4:
name: "Installation"
duration: "Week 5-8"
activities:
- "Provider installation"
- "CPE configuration"
- "Initial testing"
step_5:
name: "Acceptance testing"
duration: "Week 9"
activities:
- "Speed testing"
- "Latency verification"
- "SLA baseline"
Circuit Testing Procedures¶
circuit_testing:
speed_test:
tool: "iPerf3"
duration: "10 minutes"
direction: "Bidirectional"
acceptance: ">95% contracted bandwidth"
latency_test:
tool: "ping"
samples: 1000
acceptance:
regional: "<50ms"
intercontinental: "<150ms"
packet_loss_test:
tool: "ping"
duration: "24 hours"
acceptance: "<0.1%"
path_diversity_test:
tool: "traceroute"
verification: "Different physical paths"
7.12.3 MPLS Circuit Termination¶
Termination Process¶
mpls_termination:
notice_requirements:
contract_clause: "60-day notice required"
written_notice: "Formal letter to provider"
termination_sequence:
week_minus_8:
- "Review contract termination clauses"
- "Confirm sites ready for termination"
- "Prepare termination notices"
week_minus_6:
- "Submit formal termination notices"
- "Confirm receipt acknowledgment"
week_minus_4:
- "Final traffic verification"
- "Confirm no MPLS dependency"
week_minus_1:
- "Schedule circuit disconnection"
- "Arrange CPE return if applicable"
week_0:
- "Circuit disconnected by provider"
- "Verify final billing"
- "Document completion"
termination_schedule:
branch_circuits: "Week 15-16"
hub_circuits: "Week 18-20"
mumbai_primary: "Week 22"
7.13 Post-Migration Optimization¶
7.13.1 Optimization Framework¶
Optimization Phases¶
optimization_framework:
phase_1_stabilization:
duration: "Weeks 1-4 post-migration"
focus:
- "Monitoring and alerting tuning"
- "Issue resolution"
- "Performance baseline"
activities:
- "Review alarm thresholds"
- "Tune BFD timers"
- "Optimize routing policies"
phase_2_enhancement:
duration: "Weeks 5-8 post-migration"
focus:
- "Policy optimization"
- "Application performance"
- "Cost optimization"
activities:
- "Implement Cloud OnRamp for SaaS"
- "Fine-tune QoS policies"
- "Enable DIA where appropriate"
phase_3_advanced:
duration: "Weeks 9-12 post-migration"
focus:
- "Advanced features"
- "Automation"
- "Documentation"
activities:
- "Implement automated remediation"
- "Deploy API integrations"
- "Complete documentation"
7.13.2 Performance Optimization¶
Application Performance Tuning¶
application_optimization:
saa_optimization:
office_365:
current: "Backhauled via hub"
optimized: "Direct via Cloud OnRamp"
expected_improvement: "40% latency reduction"
salesforce:
current: "Via hub"
optimized: "Cloud OnRamp SaaS"
expected_improvement: "35% latency reduction"
sap:
current: "Private WAN"
optimized: "Optimized path with QoS"
expected_improvement: "Consistent performance"
qos_optimization:
voice_video:
dscp: "EF (46)"
queue: "LLQ 30%"
result: "Guaranteed quality"
business_critical:
dscp: "AF31 (26)"
queue: "CBWFQ 40%"
result: "Priority bandwidth"
default:
dscp: "BE (0)"
queue: "Fair queue 30%"
result: "Best effort"
Path Optimization¶
path_optimization:
aar_tuning:
latency_thresholds:
voice: 150 # ms
video: 200 # ms
business: 300 # ms
loss_thresholds:
voice: 1 # percent
video: 2 # percent
business: 5 # percent
jitter_thresholds:
voice: 30 # ms
video: 50 # ms
multi_path:
load_balancing:
method: "ECMP"
paths: 4
failover:
detection: "BFD"
switchover: "<1 second"
7.13.3 Cost Optimization¶
Post-Migration Cost Review¶
cost_optimization:
circuit_right_sizing:
review_period: "90 days post-migration"
analysis:
- "Peak utilization"
- "P95 utilization"
- "Growth trends"
actions:
- "Downgrade underutilized circuits"
- "Upgrade constrained circuits"
- "Negotiate better rates"
mpls_reduction:
phase_1:
sites: "All branches"
action: "Terminate MPLS"
savings: "$XX,XXX/month"
phase_2:
sites: "Secondary hub circuits"
action: "Terminate MPLS backup"
savings: "$XX,XXX/month"
phase_3:
sites: "Primary hub circuits"
action: "Reduce MPLS to minimum"
savings: "$XX,XXX/month"
license_optimization:
review:
- "Feature utilization"
- "License tier appropriateness"
- "Term optimization"
7.13.4 Documentation Updates¶
Post-Migration Documentation¶
documentation_updates:
network_documentation:
topology_diagrams:
- "Updated network diagrams"
- "SD-WAN overlay topology"
- "Integration diagrams"
configuration:
- "Template documentation"
- "Policy documentation"
- "Integration configuration"
operational_documentation:
runbooks:
- "Day 2 operations runbook"
- "Troubleshooting guide"
- "Escalation procedures"
procedures:
- "Change management"
- "Incident response"
- "Backup and recovery"
training_materials:
- "Updated training decks"
- "Lab exercises"
- "Quick reference guides"
7.13.5 Success Metrics¶
KPI Tracking¶
success_metrics:
technical_kpis:
availability:
target: "99.95%"
measurement: "Monthly"
latency:
target: "Within 10% of baseline"
measurement: "Daily average"
packet_loss:
target: "<0.1%"
measurement: "Daily"
business_kpis:
cost_savings:
target: "$XX,XXX/month"
measurement: "Monthly"
provisioning_time:
target: "<5 days for new site"
measurement: "Per deployment"
user_satisfaction:
target: ">90% satisfied"
measurement: "Quarterly survey"
operational_kpis:
mttr:
target: "<2 hours for P1"
measurement: "Per incident"
change_success:
target: ">95%"
measurement: "Monthly"
Document version: 1.0 Last updated: 2025 Classification: Internal Use