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L3LS_Unnumbered_DCI_Type5.unl
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README.md
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README.md

Layer 3 Leaf-Spine Fabric

Description

This virtual lab provides a full Layer 3 Leaf-Spine fabric in a 2 datacenter setup with VXLAN/EVPN. For optimization Layer 2 VNIs (Type 1 to 4) are not spread across datacenter border leafs and rather only EVPN Type-5 prefixes are exchanged. The underlay is completely built with BGP unnumbered.

Reachability between the sites is only given via L3 EVPN routing (eg. 192.168.101.0/24 <> 192.168.111.0/24), but not inside the same L2 broadcast domain (VNI isolation).

Topology

Topology

Features used

Underlay

  • IPv6 LLA
  • BGP (in data center)
  • MLAG

Overlay

  • VXLAN
    • Single attached behind MLAG
    • MLAG
    • Multi-homing A-A
  • EVPN
    • Layer 2
    • Layer 3 (S-IRB)
    • Multi-homing A-A
  • Route Filtering based on Route Target

Image

Addressing scheme

Loopback

Site 1

Device ASN Loopback 0 (EVPN) Loopback 1 (VTEP)
spine1 65100 10.255.0.101/32 n/a
spine2 65100 10.255.0.102/32 n/a
leaf1a 65100.1 10.255.0.111/32 10.255.1.110/32
10.255.1.111/32 (sec)
leaf1b 65100.1 10.255.0.112/32 10.255.1.110/32
10.255.1.112/32 (sec)
leaf2 65100.2 10.255.0.113/32 10.255.1.113/32
leaf3 65100.3 10.255.0.114/32 10.255.1.114/32
border1 65100.51 10.255.0.151/32 10.255.1.151/32
border2 65100.52 10.255.0.152/32 10.255.1.151/32

Site 2

Device ASN Loopback 0 (EVPN) Loopback 1 (VTEP)
spine1 65200 10.255.0.201/32 n/a
spine2 65200 10.255.0.202/32 n/a
leaf1a 65200.1 10.255.0.211/32 10.255.1.210/32
10.255.1.211/32 (sec)
leaf1b 65200.1 10.255.0.212/32 10.255.1.210/32
10.255.1.212/32 (sec)
leaf2 65200.2 10.255.0.213/32 10.255.1.213/32
leaf3 65200.3 10.255.0.214/32 10.255.1.214/32
border1 65200.51 10.255.0.251/32 10.255.1.251/32
border2 65200.52 10.255.0.252/32 10.255.1.252/32

DCI

Device ASN Loopback 0 (EVPN) Loopback 1 (VTEP)
border1 65000 10.255.0.11/32 n/a
border2 65000 10.255.0.12/32 n/a
border3 65000 10.255.0.13/32 n/a
border4 65000 10.255.0.14/32 n/a

EVPN L2 VPN Tenant Configuration

VLAN RT MAC VNI Tenant
100 100:100 100 n/a
101 100:100 101 Tenant-A
200 200:200 200 n/a
201 200:100 201 Tenant-B

EVPN L3 VPN Tenant Configuration

VRF RT IP VNI Site 1 Site 2
Tenant-A 1000:1000 1000 192.168.101.0/24 192.168.111.0/24
Tenant-B 2000:2000 2000 192.168.201.0/24 192.168.211.0/24

Host addressing

Site 2

Host Interface IP address VRF
host1 Po1.100 192.168.100.11/24 Tenant-A-100
host1 Po1.101 192.168.101.11/24 Tenant-A-101
host1 Po1.200 192.168.200.11/24 Tenant-B-200
host1 Po1.201 192.168.201.11/24 Tenant-B-201
host2 Po1.100 192.168.100.12/24 Tenant-A-100
host2 Po1.101 192.168.101.12/24 Tenant-A-101
host2 Po1.200 192.168.200.12/24 Tenant-B-200
host2 Po1.201 192.168.201.12/24 Tenant-B-201

Site 2

Host Interface IP address VRF
host1 Po1.100 192.168.100.13/24 Tenant-A-100
host1 Po1.101 192.168.111.13/24 Tenant-A-101
host1 Po1.200 192.168.200.13/24 Tenant-B-200
host1 Po1.201 192.168.211.13/24 Tenant-B-201
host2 Po1.100 192.168.100.14/24 Tenant-A-100
host2 Po1.101 192.168.111.14/24 Tenant-A-101
host2 Po1.200 192.168.200.14/24 Tenant-B-200
host2 Po1.201 192.168.211.14/24 Tenant-B-201