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Add detailed information to README

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Expanded the README to provide more details about the configuration,
including:

- AS Numbers
- IP Addressing (Management, Loopback, Underlay P2P, Host)
- VXLAN Network Identifiers (VNI)
- Features Implemented
- Test Connectivity
This commit is contained in:
Damien Arnodo
2025-11-30 19:16:56 +00:00
parent db54e56b41
commit 1a084d0c3f
1 changed files with 58 additions and 13 deletions
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README.md
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@@ -5,6 +5,7 @@ A production-ready Arista BGP EVPN-VXLAN data center fabric topology using Conta
## 🎯 Overview
This lab demonstrates a complete EVPN-VXLAN data center fabric with:
- **2 Spine switches** (BGP Route Reflectors)
- **8 Leaf switches** forming 4 VTEPs (MLAG pairs)
- **BGP EVPN overlay** with L2/L3 VXLAN
@@ -65,6 +66,7 @@ docker exec -it clab-arista-evpn-fabric-leaf1 Cli
## 📋 Configuration Details
### AS Numbers
- **Spine**: AS 65000
- **VTEP1 (Leaf1/2)**: AS 65001
- **VTEP2 (Leaf3/4)**: AS 65002
@@ -74,12 +76,14 @@ docker exec -it clab-arista-evpn-fabric-leaf1 Cli
### IP Addressing
#### Management Network
- Subnet: `172.16.0.0/24`
- Spine1: `172.16.0.1`
- Spine2: `172.16.0.2`
- Leaf1-8: `172.16.0.25-32`
#### Loopback Interfaces
- **Router-ID Loopbacks (Lo0)**: `10.0.250.0/24`
- Spine1: `10.0.250.1/32`
- Spine2: `10.0.250.2/32`
@@ -92,6 +96,7 @@ docker exec -it clab-arista-evpn-fabric-leaf1 Cli
- VTEP4: `10.0.255.14/32`
#### Underlay P2P Links
- Spine1 to Leafs: `10.0.1.0/31`, `10.0.1.2/31`, ... `10.0.1.14/31`
- Spine2 to Leafs: `10.0.2.0/31`, `10.0.2.2/31`, ... `10.0.2.14/31`
- MLAG iBGP peering: `10.0.3.0/31`, `10.0.3.2/31`, `10.0.3.4/31`, `10.0.3.6/31`
@@ -99,32 +104,70 @@ docker exec -it clab-arista-evpn-fabric-leaf1 Cli
#### Host Network Addressing
| Host | VLAN | VRF | IP Address | Gateway | Type |
|------|------|-----|------------|---------|------|
| ----- | ---- | ------- | --------------- | ---------- | -------- |
| host1 | 40 | default | 10.40.40.101/24 | - | L2 VXLAN |
| host2 | 34 | gold | 10.34.34.102/24 | 10.34.34.1 | L3 VXLAN |
| host3 | 40 | default | 10.40.40.103/24 | - | L2 VXLAN |
| host4 | 78 | gold | 10.78.78.104/24 | 10.78.78.1 | L3 VXLAN |
**Notes:**
- Host1 and Host3 are in VLAN 40 (L2 VXLAN only) and can communicate at Layer 2
- Host2 and Host4 are in VRF "gold" with different subnets, communicating via EVPN Type-5 routes (L3 VXLAN)
- All hosts use LACP bonding (802.3ad) with dual-homing to MLAG leaf pairs
### VXLAN Network Identifiers (VNI)
#### L2 VNI (VLAN to VNI Mapping)
| VLAN | Description | VNI | VTEPs | Route Target | Route Distinguisher |
| ---- | ------------- | ------ | ------------------------------- | ------------ | -------------------------- |
| 40 | test-l2-vxlan | 110040 | VTEP1, VTEP3 (Leaf1/2, Leaf5/6) | 40:110040 | 65001:110040, 65003:110040 |
**L2 VNI Details:**
- VLAN 40 is stretched across VTEP1 (Leaf1/2) and VTEP3 (Leaf5/6) for pure Layer 2 connectivity
- Hosts in VLAN 40 (host1 and host3) communicate at Layer 2 across the EVPN fabric
- EVPN Type-2 (MAC/IP) routes are used for MAC address learning and distribution
#### L3 VNI (VRF to VNI Mapping)
| VRF | Description | VNI | VTEPs | Route Target | VLANs |
| ---- | ------------------------------- | ------ | ------------------------------- | ------------ | ------ |
| gold | L3 VRF for inter-subnet routing | 100001 | VTEP2, VTEP4 (Leaf3/4, Leaf7/8) | 1:100001 | 34, 78 |
**L3 VNI Details:**
- VRF "gold" uses VNI 100001 for Layer 3 VXLAN routing between different subnets
- VLAN 34 (10.34.34.0/24) on VTEP2 and VLAN 78 (10.78.78.0/24) on VTEP4 are both in VRF gold
- EVPN Type-5 (IP Prefix) routes are used for inter-subnet routing
- Each VTEP advertises its local subnets via EVPN, enabling routed connectivity between host2 and host4
#### VNI Summary
| VNI Type | VNI | Purpose | EVPN Route Type |
| -------- | ------ | ----------------------------- | ------------------ |
| L2 VNI | 110040 | Layer 2 extension for VLAN 40 | Type-2 (MAC/IP) |
| L3 VNI | 100001 | Layer 3 routing for VRF gold | Type-5 (IP Prefix) |
### Features Implemented
✅ **Underlay**
- BGP IPv4 Unicast
- ECMP with 4 paths
- eBGP between Spine-Leaf
- iBGP between MLAG pairs
✅ **Overlay**
- BGP EVPN address family
- VXLAN data plane
- EVPN Type-2 (MAC/IP routes)
- EVPN Type-5 (IP Prefix routes)
✅ **High Availability**
- MLAG dual-homing
- Dual-active detection
- Anycast VTEP gateway
@@ -167,6 +210,7 @@ show mlag interfaces
### Test Connectivity
#### L2 VXLAN Testing (VLAN 40)
Test Layer 2 connectivity between host1 and host3 across the EVPN fabric:
```bash
@@ -181,6 +225,7 @@ docker exec -it clab-arista-evpn-fabric-host3 ping -c 4 10.40.40.101
```
#### L3 VXLAN Testing (VRF gold)
Test Layer 3 connectivity between host2 and host4 in VRF "gold":
```bash