6.1 Migration Strategy
6.1.1 Migration Approach Selection
| Approach |
Description |
Risk |
Duration |
Selected |
| Big Bang |
All sites simultaneously |
High |
4 weeks |
|
| Phased by Region |
Region at a time |
Medium |
32 weeks |
|
| Phased by Site |
Site at a time |
Low |
52 weeks |
|
| Phased Hybrid |
Hub sites first, branches parallel |
Medium-Low |
40 weeks |
SELECTED |
Rationale for Phased Hybrid Approach:
- Hub sites migrated sequentially (risk management)
- Branch sites migrated in parallel within regions (efficiency)
- Lessons learned from pilot applied to subsequent sites
- Resources optimized across teams
6.1.2 Migration Phases
+------------------------------------------------------------------+
| MIGRATION TIMELINE (40 WEEKS) |
+------------------------------------------------------------------+
Phase 1: Foundation (Weeks 1-6)
+----------------------------------------------------------------+
| Week 1-2 | Week 3-4 | Week 5-6 |
| DNAC | ISE | Integration |
| Install | Deploy | DNAC-ISE, Underlay Prep |
+----------------------------------------------------------------+
Phase 2: Pilot (Weeks 7-10)
+----------------------------------------------------------------+
| Week 7-8 | Week 9-10 |
| Mumbai Pilot | Validation & Refinement |
| (1 Building) | Lessons Learned |
+----------------------------------------------------------------+
Phase 3: Hub Sites (Weeks 11-22)
+----------------------------------------------------------------+
| Week 11-12 | Week 13-14 | Week 15-16 | Week 17-18 | Week 19-22 |
| Mumbai | Chennai | London | Frankfurt | NJ + Dallas|
| Full | Full | Full | Full | Full |
+----------------------------------------------------------------+
Phase 4: Branch Sites (Weeks 23-34)
+----------------------------------------------------------------+
| Week 23-26 | Week 27-30 | Week 31-34 |
| APAC Branches | EMEA Branches | Americas Branches |
| (5 sites) | (12 sites) | (15 sites) |
+----------------------------------------------------------------+
Phase 5: Optimization (Weeks 35-40)
+----------------------------------------------------------------+
| Week 35-36 | Week 37-38 | Week 39-40 |
| Performance | Training & | Documentation & |
| Tuning | Knowledge | Handover |
| | Transfer | |
+----------------------------------------------------------------+
6.1.3 Site Migration Sequence
| Order |
Site |
Type |
Devices |
Endpoints |
Duration |
Dependencies |
| 1 |
Mumbai (Pilot) |
Hub |
10 |
500 |
2 weeks |
DNAC/ISE ready |
| 2 |
Mumbai (Full) |
Hub |
52 |
4,200 |
2 weeks |
Pilot success |
| 3 |
Chennai |
Hub |
40 |
3,100 |
2 weeks |
Mumbai complete |
| 4 |
London |
Hub |
46 |
3,500 |
2 weeks |
Chennai complete |
| 5 |
Frankfurt |
Hub |
32 |
2,400 |
2 weeks |
London complete |
| 6 |
New Jersey |
Hub |
56 |
4,500 |
2 weeks |
Frankfurt complete |
| 7 |
Dallas |
Hub |
36 |
2,800 |
2 weeks |
NJ complete |
| 8-12 |
APAC Branches |
Branch |
5 each |
200-400 |
4 weeks |
Hub complete |
| 13-24 |
EMEA Branches |
Branch |
4 each |
150-300 |
4 weeks |
Hub complete |
| 25-39 |
Americas Branches |
Branch |
4 each |
150-300 |
4 weeks |
Hub complete |
6.1.4 Migration Dependencies
+------------------------------------------------------------------+
| DEPENDENCY MATRIX |
+------------------------------------------------------------------+
DNAC Installation
|
+--> ISE Deployment
| |
| +--> DNAC-ISE Integration
| |
| +--> Policy Definition
| |
+--> Underlay Provisioning |
| |
+--> Fabric Site Creation <--+
|
+--> Node Provisioning
|
+--> Host Onboarding
|
+--> User Migration
|
+--> Legacy Decommission
6.1.5 Resource Requirements
| Phase |
Network Engineers |
Security Engineers |
Project Manager |
Vendor Support |
| Phase 1 |
4 |
2 |
1 |
2 (Cisco) |
| Phase 2 |
4 |
2 |
1 |
2 (Cisco) |
| Phase 3 |
6 |
3 |
1 |
2 (Cisco) |
| Phase 4 |
8 |
2 |
1 |
1 (Cisco) |
| Phase 5 |
4 |
2 |
1 |
0 |