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README.md

Complete IP Address Plan - Arista L5 Dual DC

🎯 Design Philosophy

Avoiding 192.168.x.x to prevent conflicts with LAN subnet (192.168.1.0/24)

We'll use RFC 1918 private address space strategically:

  • Management: 10.255.0.0/24 (out-of-band)
  • DC1 Underlay: 10.1.x.x/16 range
  • DC2 Underlay: 10.2.x.x/16 range
  • DCI: 10.253.x.x range
  • Host/Tenant Networks: 172.16.x.x/16 range

📊 IP Address Summary Table

Network Purpose Subnet Size Usage
Management (OOB) 10.255.0.0/24 254 hosts ContainerLab mgmt
DC1 Loopback0 10.1.0.0/24 254 hosts Router IDs
DC1 Loopback1 10.1.1.0/24 254 hosts VTEP addresses
DC1 P2P Links 10.1.10.0/24 127 /31s Spine-Leaf links
DC1 MLAG Peer 10.1.255.0/30 Per pair MLAG peer links
DC2 Loopback0 10.2.0.0/24 254 hosts Router IDs
DC2 Loopback1 10.2.1.0/24 254 hosts VTEP addresses
DC2 P2P Links 10.2.10.0/24 127 /31s Spine-Leaf links
DC2 MLAG Peer 10.2.255.0/30 Per pair MLAG peer links
DCI Loopback 10.253.0.1/32 1 host DCI router ID
DCI P2P Links 10.253.254.0/24 127 /31s Border-DCI links
Tenant VLANs 172.16.x.0/24 Per VLAN Host networks

🔌 Management Network (Out-of-Band)

Subnet: 10.255.0.0/24

DC1 Management IPs

Device              | Management IP  | Purpose
--------------------|----------------|------------------
spine1-DC1          | 10.255.0.11    | SSH/API access
spine2-DC1          | 10.255.0.12    | SSH/API access
spine3-DC1          | 10.255.0.13    | SSH/API access
leaf1-DC1           | 10.255.0.21    | SSH/API access
leaf2-DC1           | 10.255.0.22    | SSH/API access
leaf3-DC1           | 10.255.0.23    | SSH/API access
leaf4-DC1           | 10.255.0.24    | SSH/API access
borderleaf1-DC1     | 10.255.0.31    | SSH/API access
borderleaf2-DC1     | 10.255.0.32    | SSH/API access

DC2 Management IPs

Device              | Management IP  | Purpose
--------------------|----------------|------------------
spine1-DC2          | 10.255.0.41    | SSH/API access
spine2-DC2          | 10.255.0.42    | SSH/API access
spine3-DC2          | 10.255.0.43    | SSH/API access
leaf1-DC2           | 10.255.0.51    | SSH/API access
leaf2-DC2           | 10.255.0.52    | SSH/API access
leaf3-DC2           | 10.255.0.53    | SSH/API access
leaf4-DC2           | 10.255.0.54    | SSH/API access
borderleaf1-DC2     | 10.255.0.61    | SSH/API access
borderleaf2-DC2     | 10.255.0.62    | SSH/API access

DCI Management IP

Device              | Management IP  | Purpose
--------------------|----------------|------------------
DCI                 | 10.255.0.100   | SSH/API access

Host Management IPs

Device              | Management IP  | Purpose
--------------------|----------------|------------------
host1-DC1           | 10.255.0.201   | SSH access
host2-DC1           | 10.255.0.202   | SSH access
host1-DC2           | 10.255.0.211   | SSH access
host2-DC2           | 10.255.0.212   | SSH access

🏢 DC1 - Data Center 1 IP Plan

Loopback0 Addresses (Router IDs)

Subnet: 10.1.0.0/24

Device              | Loopback0      | Mask | Router ID
--------------------|----------------|------|----------
spine1-DC1          | 10.1.0.11      | /32  | 10.1.0.11
spine2-DC1          | 10.1.0.12      | /32  | 10.1.0.12
spine3-DC1          | 10.1.0.13      | /32  | 10.1.0.13
leaf1-DC1           | 10.1.0.21      | /32  | 10.1.0.21
leaf2-DC1           | 10.1.0.22      | /32  | 10.1.0.22
leaf3-DC1           | 10.1.0.23      | /32  | 10.1.0.23
leaf4-DC1           | 10.1.0.24      | /32  | 10.1.0.24
borderleaf1-DC1     | 10.1.0.31      | /32  | 10.1.0.31
borderleaf2-DC1     | 10.1.0.32      | /32  | 10.1.0.32

Loopback1 Addresses (VTEP)

Subnet: 10.1.1.0/24

Device              | Loopback1      | Mask | Notes
--------------------|----------------|------|------------------------
leaf1-DC1           | 10.1.1.21      | /32  | Shared with leaf2
leaf2-DC1           | 10.1.1.21      | /32  | Shared with leaf1 (MLAG)
leaf3-DC1           | 10.1.1.23      | /32  | Shared with leaf4
leaf4-DC1           | 10.1.1.23      | /32  | Shared with leaf3 (MLAG)
borderleaf1-DC1     | 10.1.1.31      | /32  | Shared with borderleaf2
borderleaf2-DC1     | 10.1.1.31      | /32  | Shared with borderleaf1 (MLAG)

Note: Spines don't need Loopback1 (not VTEPs)

Point-to-Point Links (Spine-Leaf)

Subnet: 10.1.10.0/24 (using /31 subnets)

Spine1-DC1 Links

Link                              | Leaf Side    | Spine Side   | Subnet
----------------------------------|--------------|--------------|--------
leaf1-DC1:eth3 - spine1-DC1:eth2  | 10.1.10.0    | 10.1.10.1    | /31
leaf2-DC1:eth3 - spine1-DC1:eth3  | 10.1.10.2    | 10.1.10.3    | /31
leaf3-DC1:eth3 - spine1-DC1:eth4  | 10.1.10.4    | 10.1.10.5    | /31
leaf4-DC1:eth3 - spine1-DC1:eth5  | 10.1.10.6    | 10.1.10.7    | /31
border1-DC1:eth3 - spine1-DC1:eth6| 10.1.10.8    | 10.1.10.9    | /31
border2-DC1:eth3 - spine1-DC1:eth7| 10.1.10.10   | 10.1.10.11   | /31

Spine2-DC1 Links

Link                              | Leaf Side    | Spine Side   | Subnet
----------------------------------|--------------|--------------|--------
leaf1-DC1:eth4 - spine2-DC1:eth2  | 10.1.10.12   | 10.1.10.13   | /31
leaf2-DC1:eth4 - spine2-DC1:eth3  | 10.1.10.14   | 10.1.10.15   | /31
leaf3-DC1:eth4 - spine2-DC1:eth4  | 10.1.10.16   | 10.1.10.17   | /31
leaf4-DC1:eth4 - spine2-DC1:eth5  | 10.1.10.18   | 10.1.10.19   | /31
border1-DC1:eth4 - spine2-DC1:eth6| 10.1.10.20   | 10.1.10.21   | /31
border2-DC1:eth4 - spine2-DC1:eth7| 10.1.10.22   | 10.1.10.23   | /31

Spine3-DC1 Links

Link                              | Leaf Side    | Spine Side   | Subnet
----------------------------------|--------------|--------------|--------
leaf1-DC1:eth5 - spine3-DC1:eth2  | 10.1.10.24   | 10.1.10.25   | /31
leaf2-DC1:eth5 - spine3-DC1:eth3  | 10.1.10.26   | 10.1.10.27   | /31
leaf3-DC1:eth5 - spine3-DC1:eth4  | 10.1.10.28   | 10.1.10.29   | /31
leaf4-DC1:eth5 - spine3-DC1:eth5  | 10.1.10.30   | 10.1.10.31   | /31
border1-DC1:eth5 - spine3-DC1:eth6| 10.1.10.32   | 10.1.10.33   | /31
border2-DC1:eth5 - spine3-DC1:eth7| 10.1.10.34   | 10.1.10.35   | /31

MLAG Peer Links (VLAN 4094)

Subnet: 10.1.255.0/24 (using /30 subnets)

MLAG Pair           | Device          | VLAN 4094 IP | Subnet
--------------------|-----------------|--------------|--------
Leaf Pair 1         | leaf1-DC1       | 10.1.255.1   | /30
                    | leaf2-DC1       | 10.1.255.2   | /30
Leaf Pair 2         | leaf3-DC1       | 10.1.255.5   | /30
                    | leaf4-DC1       | 10.1.255.6   | /30
Border Leaf Pair    | borderleaf1-DC1 | 10.1.255.9   | /30
                    | borderleaf2-DC1 | 10.1.255.10  | /30

🏢 DC2 - Data Center 2 IP Plan

Loopback0 Addresses (Router IDs)

Subnet: 10.2.0.0/24

Device              | Loopback0      | Mask | Router ID
--------------------|----------------|------|----------
spine1-DC2          | 10.2.0.11      | /32  | 10.2.0.11
spine2-DC2          | 10.2.0.12      | /32  | 10.2.0.12
spine3-DC2          | 10.2.0.13      | /32  | 10.2.0.13
leaf1-DC2           | 10.2.0.21      | /32  | 10.2.0.21
leaf2-DC2           | 10.2.0.22      | /32  | 10.2.0.22
leaf3-DC2           | 10.2.0.23      | /32  | 10.2.0.23
leaf4-DC2           | 10.2.0.24      | /32  | 10.2.0.24
borderleaf1-DC2     | 10.2.0.31      | /32  | 10.2.0.31
borderleaf2-DC2     | 10.2.0.32      | /32  | 10.2.0.32

Loopback1 Addresses (VTEP)

Subnet: 10.2.1.0/24

Device              | Loopback1      | Mask | Notes
--------------------|----------------|------|------------------------
leaf1-DC2           | 10.2.1.21      | /32  | Shared with leaf2
leaf2-DC2           | 10.2.1.21      | /32  | Shared with leaf1 (MLAG)
leaf3-DC2           | 10.2.1.23      | /32  | Shared with leaf4
leaf4-DC2           | 10.2.1.23      | /32  | Shared with leaf3 (MLAG)
borderleaf1-DC2     | 10.2.1.31      | /32  | Shared with borderleaf2
borderleaf2-DC2     | 10.2.1.31      | /32  | Shared with borderleaf1 (MLAG)

Point-to-Point Links (Spine-Leaf)

Subnet: 10.2.10.0/24 (using /31 subnets)

Same pattern as DC1, but using 10.2.10.x range:

  • Spine1 links: 10.2.10.0 - 10.2.10.11
  • Spine2 links: 10.2.10.12 - 10.2.10.23
  • Spine3 links: 10.2.10.24 - 10.2.10.35

MLAG Peer Links (VLAN 4094)

Subnet: 10.2.255.0/24 (using /30 subnets)

MLAG Pair           | Device          | VLAN 4094 IP | Subnet
--------------------|-----------------|--------------|--------
Leaf Pair 1         | leaf1-DC2       | 10.2.255.1   | /30
                    | leaf2-DC2       | 10.2.255.2   | /30
Leaf Pair 2         | leaf3-DC2       | 10.2.255.5   | /30
                    | leaf4-DC2       | 10.2.255.6   | /30
Border Leaf Pair    | borderleaf1-DC2 | 10.2.255.9   | /30
                    | borderleaf2-DC2 | 10.2.255.10  | /30

🌐 DCI (Data Center Interconnect) IP Plan

DCI Loopback

Device              | Loopback0      | Mask | Router ID
--------------------|----------------|------|----------
DCI                 | 10.253.0.1     | /32  | 10.253.0.1

DCI Point-to-Point Links

Subnet: 10.253.254.0/24 (using /31 subnets)

Link                                | Borderleaf Side | DCI Side     | Subnet
------------------------------------|-----------------|--------------|--------
borderleaf1-DC1:eth12 - DCI:eth1    | 10.253.254.0    | 10.253.254.1 | /31
borderleaf2-DC1:eth12 - DCI:eth2    | 10.253.254.2    | 10.253.254.3 | /31
borderleaf1-DC2:eth12 - DCI:eth3    | 10.253.254.4    | 10.253.254.5 | /31
borderleaf2-DC2:eth12 - DCI:eth4    | 10.253.254.6    | 10.253.254.7 | /31

🖥️ Tenant/Host Networks

VLAN Allocation

Subnet: 172.16.x.0/24 (one /24 per VLAN)

VLAN ID | VLAN Name    | Subnet          | Gateway      | Purpose
--------|--------------|-----------------|--------------|------------------
100     | TENANT-A     | 172.16.100.0/24 | 172.16.100.1 | Tenant A workloads
200     | TENANT-B     | 172.16.200.0/24 | 172.16.200.1 | Tenant B workloads
300     | DMZ          | 172.16.300.0/24 | 172.16.300.1 | DMZ services
4094    | MLAG-PEER    | (see above)     | N/A          | MLAG peer link

Host IP Assignments

Host Device    | VLAN | IP Address      | Gateway      | Bond Interface
---------------|------|-----------------|--------------|---------------
host1-DC1      | 100  | 172.16.100.10/24| 172.16.100.1 | bond0
host2-DC1      | 200  | 172.16.200.10/24| 172.16.200.1 | bond0
host1-DC2      | 100  | 172.16.100.20/24| 172.16.100.1 | bond0
host2-DC2      | 200  | 172.16.200.20/24| 172.16.200.1 | bond0

📋 BGP ASN Allocation

DC1 ASNs

Device Type         | Devices                      | ASN
--------------------|------------------------------|--------
Spines              | spine1-3 DC1                 | 65100
Leaf Pair 1         | leaf1-DC1, leaf2-DC1         | 65101
Leaf Pair 2         | leaf3-DC1, leaf4-DC1         | 65102
Border Leaf Pair    | borderleaf1-2 DC1            | 65103

DC2 ASNs

Device Type         | Devices                      | ASN
--------------------|------------------------------|--------
Spines              | spine1-3 DC2                 | 65200
Leaf Pair 1         | leaf1-DC2, leaf2-DC2         | 65201
Leaf Pair 2         | leaf3-DC2, leaf4-DC2         | 65202
Border Leaf Pair    | borderleaf1-2 DC2            | 65203

DCI ASN

Device              | ASN   | Purpose
--------------------|-------|--------------------------------
DCI                 | 65000 | Neutral AS for inter-DC routing

🔍 IP Address Validation

No Conflicts With Your LAN ✅

Your LAN:       192.168.1.0/24
Our Plan:       10.x.x.x and 172.16.x.x
Conflict Risk:  NONE ✅

Subnets Summary

Purpose              | Subnet Range      | Total IPs
---------------------|-------------------|----------
Management           | 10.255.0.0/24     | 254
DC1 Infrastructure   | 10.1.0.0/16       | 65,534
DC2 Infrastructure   | 10.2.0.0/16       | 65,534
DCI                  | 10.253.0.0/16     | 65,534
Tenant Networks      | 172.16.0.0/16     | 65,534

🚀 Quick Reference Commands

Test Management Connectivity

# DC1 Spines
ping 10.255.0.11
ping 10.255.0.12
ping 10.255.0.13

# DC1 Leafs
ping 10.255.0.21
ping 10.255.0.22

# DCI
ping 10.255.0.50

SSH Access

# Access spine1-DC1
ssh admin@10.255.0.11

# Access leaf1-DC1
ssh admin@10.255.0.21

# Access DCI
ssh admin@10.255.0.50

Verify Underlay from any leaf

# Check loopback reachability (should reach all loopbacks)
ping 10.1.0.11 source 10.1.0.21

# Check BGP neighbors
show ip bgp summary

# Verify ECMP paths
show ip route 10.1.1.23

💡 Design Highlights

  1. Clean Separation: Each DC has its own /16 (10.1.x.x and 10.2.x.x)
  2. Consistent Numbering: Same pattern in both DCs
  3. Easy Troubleshooting: IP tells you the location/role
    • .0.x = Loopback0 (router-id)
    • .1.x = Loopback1 (VTEP)
    • .10.x = P2P links
    • .255.x = MLAG peer links
  4. Scalable: Room for growth in each range
  5. No LAN Conflicts: Completely avoids 192.168.x.x space

This addressing plan is production-ready and automation-friendly! 🎯

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