1.1 Current WAN Infrastructure Inventory
| Item |
Details |
| Document Version |
1.0 |
| Last Updated |
December 2025 |
| Author |
Network Architecture Team |
| Organization |
Abhavtech.com |
| Classification |
Internal Use Only |
1.1.1 Overview
This section documents the complete inventory of Abhavtech.com's existing WAN infrastructure prior to the SD-WAN migration. A thorough understanding of current assets, circuit inventory, and device configurations is essential for planning a successful migration from traditional MPLS to Cisco Catalyst SD-WAN.
Inventory Objectives
- Document all WAN edge devices and their configurations
- Catalog existing MPLS circuits with provider details
- Identify Internet and backup connectivity at each site
- Map current routing protocols and topologies
- Assess hardware lifecycle and refresh requirements
- Establish baseline for migration planning
1.1.2 Site Overview and Classification
Global Site Distribution
ABHAVTECH.COM GLOBAL WAN TOPOLOGY
=================================
┌─────────────────────────────────────────────────────┐
│ AMERICAS REGION │
│ ┌─────────────┐ ┌─────────────┐ │
│ │ New Jersey │◄────────►│ Dallas │ │
│ │ (Hub) │ MPLS │ (Hub) │ │
│ └──────┬──────┘ └──────┬──────┘ │
└─────────┼────────────────────────┼──────────────────┘
│ │
│ Global MPLS Core │
│ │
┌─────────┼────────────────────────┼──────────────────┐
│ │ EMEA REGION │ │
│ ┌──────▼──────┐ ┌──────▼──────┐ │
│ │ London │◄────────►│ Frankfurt │ │
│ │ (Hub) │ MPLS │ (Hub) │ │
│ └──────┬──────┘ └──────┬──────┘ │
└─────────┼────────────────────────┼──────────────────┘
│ │
│ Global MPLS Core │
│ │
┌─────────────────────────────┼────────────────────────┼────────────────────────────────┐
│ │ INDIA REGION │ │
│ ┌─────────────┐ ┌──────▼──────┐ ┌──────▼──────┐ ┌─────────────┐ │
│ │ Bangalore │◄───►│ Mumbai │◄────────►│ Chennai │◄───►│ Delhi │ │
│ │ (Branch) │ │ (Primary DC)│ MPLS │ (DR DC) │ │ (Branch) │ │
│ └─────────────┘ └──────┬──────┘ └──────┬──────┘ └─────────────┘ │
│ │ │ │
│ ┌──────▼──────┐ │ │
│ │ Noida │◄────────────────┘ │
│ │ (Branch) │ │
│ └─────────────┘ │
└──────────────────────────────────────────────────────────────────────────────────────┘
Site Classification Matrix
| Site |
Region |
Classification |
Role |
Users |
Critical Apps |
| Mumbai |
India |
Tier-1 Hub |
Primary DC |
850 |
ERP, Core Banking, SAP |
| Chennai |
India |
Tier-1 Hub |
DR DC |
420 |
DR Systems, Backup |
| Bangalore |
India |
Tier-2 Branch |
Engineering |
380 |
DevOps, Cloud Access |
| Delhi |
India |
Tier-2 Branch |
Sales/Admin |
290 |
CRM, Office 365 |
| Noida |
India |
Tier-2 Branch |
Development |
340 |
CI/CD, Code Repos |
| London |
EMEA |
Tier-1 Hub |
Regional HQ |
180 |
Finance, Compliance |
| Frankfurt |
EMEA |
Tier-1 Hub |
EU Operations |
150 |
Trading, Analytics |
| New Jersey |
Americas |
Tier-1 Hub |
US HQ |
220 |
Executive, Legal |
| Dallas |
Americas |
Tier-1 Hub |
US Operations |
165 |
Support, Customer Ops |
Site Tier Definitions
| Tier |
Classification |
Characteristics |
HA Requirement |
| Tier-1 Hub |
Data Center/Regional HQ |
>100 users, Critical services |
Dual router, Dual circuits |
| Tier-2 Branch |
Regional Office |
50-400 users, Standard services |
Single/Dual router |
| Tier-3 Branch |
Small Office |
<50 users, Limited services |
Single router |
1.1.3 WAN Edge Router Inventory
Current Router Deployment
| Site |
Router Model |
IOS Version |
Role |
Serial Number |
Install Date |
EoL Status |
| Mumbai-R1 |
ISR4451-X |
16.12.4 |
Primary WAN |
FGL2134ABCD |
Mar 2020 |
Active |
| Mumbai-R2 |
ISR4451-X |
16.12.4 |
Secondary WAN |
FGL2134EFGH |
Mar 2020 |
Active |
| Chennai-R1 |
ISR4351 |
16.12.4 |
Primary WAN |
FGL2145IJKL |
Jun 2020 |
Active |
| Chennai-R2 |
ISR4351 |
16.12.4 |
Secondary WAN |
FGL2145MNOP |
Jun 2020 |
Active |
| Bangalore-R1 |
ISR4331 |
16.12.4 |
Primary WAN |
FGL2156QRST |
Sep 2020 |
Active |
| Delhi-R1 |
ISR4331 |
16.12.4 |
Primary WAN |
FGL2167UVWX |
Sep 2020 |
Active |
| Noida-R1 |
ISR4331 |
16.12.4 |
Primary WAN |
FGL2178YZAB |
Dec 2020 |
Active |
| London-R1 |
ISR4351 |
16.12.4 |
Primary WAN |
FGL2189CDEF |
Jan 2021 |
Active |
| London-R2 |
ISR4351 |
16.12.4 |
Secondary WAN |
FGL2189GHIJ |
Jan 2021 |
Active |
| Frankfurt-R1 |
ISR4351 |
16.12.4 |
Primary WAN |
FGL2190KLMN |
Feb 2021 |
Active |
| Frankfurt-R2 |
ISR4351 |
16.12.4 |
Secondary WAN |
FGL2190OPQR |
Feb 2021 |
Active |
| New Jersey-R1 |
ISR4451-X |
16.12.4 |
Primary WAN |
FGL2201STUV |
Mar 2021 |
Active |
| New Jersey-R2 |
ISR4451-X |
16.12.4 |
Secondary WAN |
FGL2201WXYZ |
Mar 2021 |
Active |
| Dallas-R1 |
ISR4351 |
16.12.4 |
Primary WAN |
FGL2212ABCD |
Apr 2021 |
Active |
| Dallas-R2 |
ISR4351 |
16.12.4 |
Secondary WAN |
FGL2212EFGH |
Apr 2021 |
Active |
Router Hardware Specifications
| Model |
Max Throughput |
Memory |
Flash |
NIM Slots |
Performance |
| ISR4451-X |
2 Gbps |
16 GB |
8 GB |
3 |
Enterprise aggregation |
| ISR4351 |
400 Mbps |
8 GB |
4 GB |
3 |
Branch aggregation |
| ISR4331 |
300 Mbps |
8 GB |
4 GB |
2 |
Branch office |
Network Interface Module (NIM) Inventory
| Site |
Router |
Slot 0 |
Slot 1 |
Slot 2 |
| Mumbai-R1 |
ISR4451-X |
NIM-2GE-CU |
NIM-4FXS |
NIM-ES2-8 |
| Mumbai-R2 |
ISR4451-X |
NIM-2GE-CU |
NIM-4FXS |
NIM-ES2-8 |
| Chennai-R1 |
ISR4351 |
NIM-2GE-CU |
NIM-4FXS |
Empty |
| Chennai-R2 |
ISR4351 |
NIM-2GE-CU |
NIM-4FXS |
Empty |
| Bangalore-R1 |
ISR4331 |
NIM-2GE-CU |
NIM-4G-LTE |
- |
| Delhi-R1 |
ISR4331 |
NIM-2GE-CU |
NIM-4G-LTE |
- |
| Noida-R1 |
ISR4331 |
NIM-2GE-CU |
NIM-4G-LTE |
- |
| London-R1 |
ISR4351 |
NIM-2GE-CU |
Empty |
Empty |
| London-R2 |
ISR4351 |
NIM-2GE-CU |
Empty |
Empty |
| Frankfurt-R1 |
ISR4351 |
NIM-2GE-CU |
Empty |
Empty |
| Frankfurt-R2 |
ISR4351 |
NIM-2GE-CU |
Empty |
Empty |
| New Jersey-R1 |
ISR4451-X |
NIM-2GE-CU |
NIM-4FXS |
NIM-ES2-8 |
| New Jersey-R2 |
ISR4451-X |
NIM-2GE-CU |
NIM-4FXS |
NIM-ES2-8 |
| Dallas-R1 |
ISR4351 |
NIM-2GE-CU |
Empty |
Empty |
| Dallas-R2 |
ISR4351 |
NIM-2GE-CU |
Empty |
Empty |
1.1.4 MPLS Circuit Inventory
Primary MPLS Circuits
| Circuit ID |
Site |
Provider |
CIR (Mbps) |
Port Speed |
Contract End |
Monthly Cost |
| MPLS-MUM-001 |
Mumbai |
Tata Communications |
500 |
1000 |
Dec 2026 |
$X,XXX |
| MPLS-MUM-002 |
Mumbai |
Bharti Airtel |
300 |
500 |
Mar 2026 |
$X,XXX |
| MPLS-CHE-001 |
Chennai |
Tata Communications |
300 |
500 |
Dec 2026 |
$X,XXX |
| MPLS-CHE-002 |
Chennai |
Reliance Jio |
200 |
500 |
Jun 2026 |
$X,XXX |
| MPLS-BLR-001 |
Bangalore |
Tata Communications |
200 |
300 |
Dec 2026 |
$X,XXX |
| MPLS-DEL-001 |
Delhi |
Bharti Airtel |
150 |
300 |
Mar 2026 |
$X,XXX |
| MPLS-NOI-001 |
Noida |
Tata Communications |
150 |
300 |
Dec 2026 |
$X,XXX |
| MPLS-LON-001 |
London |
BT Global |
200 |
500 |
Sep 2026 |
$X,XXX |
| MPLS-LON-002 |
London |
Vodafone |
100 |
200 |
Sep 2026 |
$X,XXX |
| MPLS-FRA-001 |
Frankfurt |
Deutsche Telekom |
200 |
500 |
Sep 2026 |
$X,XXX |
| MPLS-FRA-002 |
Frankfurt |
Colt |
100 |
200 |
Sep 2026 |
$X,XXX |
| MPLS-NJ-001 |
New Jersey |
AT&T |
300 |
500 |
Jun 2026 |
$X,XXX |
| MPLS-NJ-002 |
New Jersey |
Verizon |
200 |
300 |
Jun 2026 |
$X,XXX |
| MPLS-DAL-001 |
Dallas |
AT&T |
200 |
300 |
Jun 2026 |
$X,XXX |
| MPLS-DAL-002 |
Dallas |
Lumen |
100 |
200 |
Jun 2026 |
$X,XXX |
MPLS Circuit Summary
| Metric |
Value |
| Total Circuits |
15 |
| Total CIR Bandwidth |
3,000 Mbps |
| Total Monthly Cost |
$XX,XXX |
| Average Cost per Mbps |
$XX.XX |
| Primary Provider |
Tata Communications (5 circuits) |
| Secondary Provider |
AT&T (3 circuits) |
MPLS Service Level Agreements
| SLA Metric |
Contracted Value |
Current Performance |
| Availability |
99.95% |
99.92% |
| Latency (Regional) |
<15 ms |
12-18 ms |
| Latency (Inter-Regional) |
<150 ms |
120-180 ms |
| Jitter |
<5 ms |
3-8 ms |
| Packet Loss |
<0.1% |
0.05-0.15% |
1.1.5 Internet Circuit Inventory
Direct Internet Access (DIA) Circuits
| Circuit ID |
Site |
Provider |
Bandwidth |
Type |
IP Addresses |
Monthly Cost |
| DIA-MUM-001 |
Mumbai |
Tata |
500 Mbps |
Fiber |
/29 (6 usable) |
$X,XXX |
| DIA-MUM-002 |
Mumbai |
Airtel |
300 Mbps |
Fiber |
/29 (6 usable) |
$X,XXX |
| DIA-CHE-001 |
Chennai |
ACT |
200 Mbps |
Fiber |
/30 (2 usable) |
$XXX |
| DIA-BLR-001 |
Bangalore |
ACT |
150 Mbps |
Fiber |
/30 (2 usable) |
$XXX |
| DIA-DEL-001 |
Delhi |
Excitel |
100 Mbps |
Fiber |
/30 (2 usable) |
$XXX |
| DIA-NOI-001 |
Noida |
Spectra |
100 Mbps |
Fiber |
/30 (2 usable) |
$XXX |
| DIA-LON-001 |
London |
BT |
200 Mbps |
Fiber |
/29 (6 usable) |
$X,XXX |
| DIA-FRA-001 |
Frankfurt |
DE-CIX |
200 Mbps |
Fiber |
/29 (6 usable) |
$X,XXX |
| DIA-NJ-001 |
New Jersey |
Comcast |
300 Mbps |
Fiber |
/29 (6 usable) |
$X,XXX |
| DIA-DAL-001 |
Dallas |
Spectrum |
200 Mbps |
Fiber |
/30 (2 usable) |
$XXX |
Internet Circuit Summary
| Metric |
Value |
| Total Circuits |
10 |
| Total Bandwidth |
2,250 Mbps |
| Total Monthly Cost |
$XX,XXX |
| Average Cost per Mbps |
$X.XX |
1.1.6 Backup and Cellular Connectivity
4G/LTE Backup Circuits
| Site |
Provider |
SIM Plan |
Bandwidth |
Purpose |
Monthly Cost |
| Bangalore |
Jio |
100 GB |
Up to 50 Mbps |
WAN Backup |
$XX |
| Delhi |
Airtel |
100 GB |
Up to 50 Mbps |
WAN Backup |
$XX |
| Noida |
Jio |
100 GB |
Up to 50 Mbps |
WAN Backup |
$XX |
| Mumbai |
Vodafone |
Unlimited |
Up to 100 Mbps |
Emergency |
$XX |
| Chennai |
Airtel |
Unlimited |
Up to 100 Mbps |
Emergency |
$XX |
Cellular Backup Summary
| Metric |
Value |
| Total SIMs |
5 |
| Total Monthly Cost |
$XXX |
| Coverage |
5 of 9 sites (56%) |
| Max Bandwidth |
100 Mbps |
1.1.7 Current Routing Configuration
Routing Protocol Summary
| Protocol |
Scope |
Purpose |
| EIGRP |
Internal (LAN) |
Campus routing integration |
| BGP |
WAN Edge |
MPLS PE peering |
| OSPF |
WAN Edge |
Internet edge routing |
| Static |
Backup |
Failover routes |
BGP Autonomous System Numbers
| Site |
Local ASN |
Provider ASN |
Description |
| Mumbai |
65001 |
4755 (Tata) |
Primary MPLS PE |
| Mumbai |
65001 |
9498 (Airtel) |
Secondary MPLS PE |
| Chennai |
65002 |
4755 (Tata) |
Primary MPLS PE |
| Chennai |
65002 |
55836 (Jio) |
Secondary MPLS PE |
| London |
65003 |
5400 (BT) |
Primary MPLS PE |
| Frankfurt |
65004 |
3320 (DTAG) |
Primary MPLS PE |
| New Jersey |
65005 |
7018 (AT&T) |
Primary MPLS PE |
| Dallas |
65006 |
7018 (AT&T) |
Primary MPLS PE |
Sample BGP Configuration (Mumbai-R1)
! BGP Configuration for WAN Edge Router
router bgp 65001
bgp log-neighbor-changes
bgp graceful-restart
!
neighbor 10.255.1.1 remote-as 4755
neighbor 10.255.1.1 description Tata-MPLS-PE
neighbor 10.255.1.1 update-source GigabitEthernet0/0/0
neighbor 10.255.1.1 timers 10 30
neighbor 10.255.1.1 password 7 <encrypted>
!
address-family ipv4
network 10.10.0.0 mask 255.255.0.0
network 10.20.0.0 mask 255.255.0.0
neighbor 10.255.1.1 activate
neighbor 10.255.1.1 send-community both
neighbor 10.255.1.1 soft-reconfiguration inbound
neighbor 10.255.1.1 prefix-list ADVERTISE-ROUTES out
neighbor 10.255.1.1 prefix-list ACCEPT-ROUTES in
exit-address-family
!
ip prefix-list ADVERTISE-ROUTES seq 10 permit 10.10.0.0/16
ip prefix-list ADVERTISE-ROUTES seq 20 permit 10.20.0.0/16
ip prefix-list ACCEPT-ROUTES seq 10 permit 0.0.0.0/0
ip prefix-list ACCEPT-ROUTES seq 20 permit 10.0.0.0/8 le 24
VRF Configuration Summary
| VRF Name |
Route Distinguisher |
Route Target Import |
Route Target Export |
Sites |
| CORPORATE |
65001:100 |
65001:100 |
65001:100 |
All |
| GUEST |
65001:200 |
65001:200 |
65001:200 |
All |
| IOT |
65001:300 |
65001:300 |
65001:300 |
DC Only |
| VOICE |
65001:400 |
65001:400 |
65001:400 |
All |
| PCI |
65001:500 |
65001:500 |
65001:500 |
Mumbai, NJ |
1.1.8 SD-Access Integration Points
Existing SD-Access Border Nodes
| Site |
Border Node |
Platform |
L3 Handoff Interface |
Status |
| Mumbai |
MUM-BDR-01 |
C9500-48Y4C |
TenGigabitEthernet1/0/1 |
Operational |
| Mumbai |
MUM-BDR-02 |
C9500-48Y4C |
TenGigabitEthernet1/0/1 |
Operational |
| Chennai |
CHE-BDR-01 |
C9500-48Y4C |
TenGigabitEthernet1/0/1 |
Operational |
| Chennai |
CHE-BDR-02 |
C9500-48Y4C |
TenGigabitEthernet1/0/1 |
Operational |
| Bangalore |
BLR-BDR-01 |
C9300-48U |
GigabitEthernet1/0/48 |
Operational |
| Delhi |
DEL-BDR-01 |
C9300-48U |
GigabitEthernet1/0/48 |
Operational |
| Noida |
NOI-BDR-01 |
C9300-48U |
GigabitEthernet1/0/48 |
Operational |
Virtual Network (VN) to VRF Mapping
| Virtual Network |
VRF Name |
VLAN ID |
VNI |
SGT Range |
| Employee_VN |
CORPORATE |
1001 |
50001 |
10-99 |
| Guest_VN |
GUEST |
1002 |
50002 |
100-199 |
| IoT_VN |
IOT |
1003 |
50003 |
200-299 |
| Voice_VN |
VOICE |
1004 |
50004 |
300-399 |
| Shared_Services_VN |
PCI |
1005 |
50005 |
400-499 |
Current SD-Access to WAN Handoff
┌─────────────────────────────────────────────────────────────────────────────┐
│ CURRENT SD-ACCESS TO WAN HANDOFF │
├─────────────────────────────────────────────────────────────────────────────┤
│ │
│ ┌──────────────┐ VRF-Lite ┌──────────────┐ MPLS VPN │
│ │ SD-Access │ ═══════════════► │ ISR 4451 │ ═══════════════► │
│ │ Border Node │ │ (WAN Edge) │ Provider PE │
│ │ C9500-48Y4C │ ◄═══════════════ │ │ ◄═══════════════ │
│ └──────────────┘ └──────────────┘ │
│ │ │ │
│ │ eBGP (AS 65100) │ eBGP (AS 65001) │
│ │ 5 VRFs │ 5 VRFs │
│ │ TrustSec Inline │ No SGT (to be added) │
│ │ │ │
└─────────────────────────────────────────────────────────────────────────────┘
1.1.9 Infrastructure Management Systems
| System |
Purpose |
Version |
Integration Status |
| Cisco Prime Infrastructure |
Device Management |
3.10 |
Active |
| SolarWinds NPM |
Monitoring |
2023.4 |
Active |
| Splunk |
Log Management |
9.1 |
Active |
| ServiceNow |
ITSM |
Utah |
Active |
| Infoblox |
IPAM/DNS/DHCP |
8.6 |
Active |
| Catalyst Center |
SD-Access Management |
2.3.7.x |
Active |
| ISE |
Identity Services |
3.3 |
Active |
SNMP Configuration Summary
| Parameter |
Value |
| SNMP Version |
v3 (SNMPv2c legacy) |
| Auth Protocol |
SHA |
| Privacy Protocol |
AES-256 |
| Polling Interval |
5 minutes |
| Trap Destination |
10.10.1.50 (SolarWinds) |
Sample SNMP Configuration
! SNMPv3 Configuration
snmp-server group MONITORING v3 priv
snmp-server user npmusername MONITORING v3 auth sha <auth-pass> priv aes 256 <priv-pass>
snmp-server host 10.10.1.50 version 3 priv npmusername
snmp-server enable traps
snmp-server location Mumbai-DC-Rack-A12
snmp-server contact noc@abhavtech.com
1.1.10 Hardware Lifecycle Assessment
End-of-Life Analysis
| Platform |
EoS Announced |
EoL Date |
Security Support End |
Recommendation |
| ISR4451-X |
Not Announced |
N/A |
N/A |
Continue, SD-WAN capable |
| ISR4351 |
Not Announced |
N/A |
N/A |
Continue, SD-WAN capable |
| ISR4331 |
Not Announced |
N/A |
N/A |
Continue, SD-WAN capable |
SD-WAN Hardware Upgrade Path
| Current Platform |
SD-WAN Capable |
Recommended Upgrade |
Notes |
| ISR4451-X |
Yes (controller mode) |
C8300-2N2S-6T |
Better throughput, native SD-WAN |
| ISR4351 |
Yes (controller mode) |
C8300-1N1S-6T |
Better throughput, native SD-WAN |
| ISR4331 |
Yes (controller mode) |
C8200L-1N-4T |
Cost-effective for branches |
Recommended New Hardware
| Site Type |
Recommended Model |
Throughput |
Use Case |
| Data Center Hub |
C8500-12X4QC |
20 Gbps |
High-capacity aggregation |
| Regional Hub |
C8300-2N2S-6T |
5 Gbps |
Regional aggregation |
| Large Branch |
C8300-1N1S-6T |
2.5 Gbps |
Branch with growth |
| Small Branch |
C8200L-1N-4T |
1 Gbps |
Cost-effective branch |
1.1.11 Inventory Summary and Migration Impact
Current State Summary
| Category |
Count |
Monthly Cost |
| WAN Edge Routers |
15 |
N/A (CapEx) |
| MPLS Circuits |
15 |
$XX,XXX |
| DIA Circuits |
10 |
$XX,XXX |
| 4G/LTE Backup |
5 |
$XXX |
| Total Monthly WAN Cost |
- |
$XX,XXX |
Assets Requiring Migration
| Asset Type |
Total Count |
Migration Action |
| WAN Edge Routers |
15 |
Convert to controller mode or replace |
| MPLS Circuits |
15 |
Phase out over 12-18 months |
| DIA Circuits |
10 |
Retain and expand |
| BGP Configurations |
8 ASNs |
Migrate to OMP |
| VRF Configurations |
5 VRFs |
Map to Service VPNs |
| SD-Access Handoffs |
7 borders |
Reconfigure for SD-WAN |
Key Discovery Findings
- Hardware: All existing ISR 4000 series routers are SD-WAN capable in controller mode
- Circuits: MPLS represents 85% of WAN cost; significant savings potential with SD-WAN
- Routing: BGP configurations well-documented; VRF structure aligns with SD-WAN Service VPNs
- Integration: SD-Access border nodes prepared for VRF-Lite handoff to SD-WAN
- Management: Existing tools can integrate with SD-WAN Manager via APIs
References
| Document |
Description |
| Cisco SD-WAN Hardware Compatibility |
Platform support matrix |
| Cisco ISR 4000 Series Data Sheet |
Current router specifications |
| Cisco Catalyst 8000 Series Data Sheet |
Recommended upgrade platforms |
| Abhavtech Network Diagrams |
Internal topology documentation |
| SD-Access Documentation v3.0 |
LAN infrastructure reference |
Document Version: 1.0
Last Updated: December 2025
Classification: Internal Use Only
Abhavtech.com - SD-WAN Documentation