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arista-evpn-vxlan-clab/evpn-lab.clab.yml
Damien 1080bf07bb Complete Lab Fixes - L2 and L3 VXLAN Fully Operational (#14) 
## Summary

This PR merges all fixes and improvements from the troubleshooting journey to make the Arista EVPN-VXLAN lab fully operational with both L2 and L3 VXLAN connectivity.

## What's Changed

### 🎯 Major Achievements
- ✅ **L2 VXLAN fully operational** - host1 ↔ host3 connectivity verified
- ✅ **L3 VXLAN fully operational** - host2 ↔ host4 connectivity verified (VRF gold)
- ✅ **LACP bonding working** - dual-homed hosts with proper Port-Channel negotiation
- ✅ **All BGP/EVPN sessions established** - complete underlay and overlay working

### 🔧 Infrastructure Fixes

#### BGP & Routing
- Added `ip routing` command to all spine and leaf switches
- Fixed duplicate BGP network statements on leaf3, leaf4, leaf7, leaf8
- Activated EVPN neighbors on spine switches
- Added loopback network advertisements to BGP

#### MLAG Configuration
- Configured MLAG peer-link in trunk mode (not access) for VLAN 4090/4091
- Added dual-active detection via management interface
- Configured virtual router MAC for MLAG pairs

#### Switch Port Configuration
- Port-Channel1 configured in **trunk mode** on all leaf switches
- Added `switchport trunk allowed vlan` for host VLANs (34, 40, 78)
- Removed `no shutdown` from Port-Channel interfaces

### 🖥️ Host Networking - Complete Redesign

#### Image Change
- **Old:** `alpine:latest` (had bonding syntax issues)
- **New:** `ghcr.io/hellt/network-multitool` (networking tools pre-installed)

#### LACP Bonding Configuration
Proper LACP setup following network-multitool best practices:
```yaml
- ip link add bond0 type bond mode 802.3ad
- ip link set dev bond0 type bond xmit_hash_policy layer3+4
- ip link set dev eth1 down
- ip link set dev eth2 down
- ip link set eth1 master bond0
- ip link set eth2 master bond0
- ip link set dev eth1 up
- ip link set dev eth2 up
- ip link set dev bond0 type bond lacp_rate fast
- ip link set dev bond0 up
```

#### VLAN Configuration
- **L2 VXLAN hosts (host1, host3):** VLAN 40 tagged on bond0
- **L3 VXLAN hosts (host2, host4):** VLANs 34 and 78 tagged on bond0

#### Routing Strategy
- Kept management default route (172.16.0.254 via eth0)
- Added **specific routes** for L3 VXLAN networks instead of default routes:
  - host2: `ip route add 10.78.78.0/24 via 10.34.34.1`
  - host4: `ip route add 10.34.34.0/24 via 10.78.78.1`

### 📁 Files Changed

#### Switch Configurations (Updated)
- `configs/spine1.cfg` - Added ip routing, EVPN activation
- `configs/spine2.cfg` - Added ip routing, EVPN activation
- `configs/leaf1.cfg` - Port-Channel trunk mode, VLAN config
- `configs/leaf2.cfg` - Port-Channel trunk mode, VLAN config
- `configs/leaf3.cfg` - Added ip routing, loopback ads, Port-Channel config
- `configs/leaf4.cfg` - Added ip routing, loopback ads, Port-Channel config
- `configs/leaf5.cfg` - Port-Channel trunk mode, VLAN config
- `configs/leaf6.cfg` - Port-Channel trunk mode, VLAN config
- `configs/leaf7.cfg` - Added ip routing, loopback ads, Port-Channel config
- `configs/leaf8.cfg` - Added ip routing, loopback ads, Port-Channel config

#### Topology (Updated)
- `evpn-lab.clab.yml` - Updated all host configurations with network-multitool image and proper LACP/VLAN setup

#### Documentation (New)
- `hosts/README.md` - Host interface configuration guide
- `hosts/host1_interfaces` - Interface file for host1 (not currently used, kept for reference)
- `hosts/host2_interfaces` - Interface file for host2 (not currently used, kept for reference)
- `hosts/host3_interfaces` - Interface file for host3 (not currently used, kept for reference)
- `hosts/host4_interfaces` - Interface file for host4 (not currently used, kept for reference)

## Testing & Verification

### ✅ L2 VXLAN (VLAN 40)
```
host1 (10.40.40.101) → host3 (10.40.40.103)
- Connectivity: VERIFIED ✓
- VXLAN tunnel: VTEP1 ↔ VTEP3
- MAC learning: Working via EVPN Type-2
```

### ✅ L3 VXLAN (VRF gold)
```
host2 (10.34.34.102) → host4 (10.78.78.104)
- Connectivity: VERIFIED ✓
- Ping results: 0% packet loss, TTL=62
- Routing: Via EVPN Type-5 through fabric
```

### ✅ Infrastructure Status
- BGP Underlay: All sessions ESTAB
- EVPN Overlay: All neighbors ESTAB
- MLAG: All 4 pairs operational
- Port-Channels: LACP negotiated on all hosts

## Related Issues

Fixes #1 - Lab deployment and configuration fixes
Fixes #2 - BGP EVPN neighbors stuck in Connect state
Fixes #3 - Ready for deployment with EVPN activation
Fixes #4 - Lab convergence in progress
Fixes #5 - BGP EVPN neighbors stuck in Active state
Fixes #11 - Host LACP bonding configuration
Fixes #13 - L3 VXLAN default route issue

## Key Technical Learnings

1. **Arista EOS requires explicit `ip routing`** before BGP can function
2. **MLAG peer-link must be trunk mode** to allow VLAN 4090/4091 traversal
3. **VLAN tagging location matters** - hosts tag, switches use trunk mode
4. **network-multitool image** superior to Alpine for LACP bonding
5. **Specific routes better than default routes** when management network present
6. **LACP rate fast** ensures quick negotiation with Arista switches

## Deployment

After merging, deploy with:
```bash
cd ~/arista-evpn-vxlan-clab
sudo containerlab destroy -t evpn-lab.clab.yml --cleanup
sudo containerlab deploy -t evpn-lab.clab.yml
```

No manual post-deployment configuration needed - everything works from initial deployment!

## Breaking Changes

⚠️ **Host image changed** from `alpine:latest` to `ghcr.io/hellt/network-multitool`
⚠️ **Host configuration completely redesigned** - old exec commands replaced

## Reviewers

@Damien - Please review and merge when ready

---

**This PR represents the complete troubleshooting journey and brings the lab to production-ready status with full L2 and L3 VXLAN functionality.** 🚀

Reviewed-on: #14
Co-authored-by: Damien <damien@arnodo.fr>
Co-committed-by: Damien <damien@arnodo.fr>
2025-11-30 10:24:29 +00:00

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name: arista-evpn-fabric
mgmt:
network: evpn-mgmt
ipv4-subnet: 172.16.0.0/24
ipv4-gw: 172.16.0.254
topology:
kinds:
arista_ceos:
image: ceos:4.35.0F
nodes:
# Spine Switches
spine1:
kind: arista_ceos
mgmt-ipv4: 172.16.0.1
startup-config: configs/spine1.cfg
spine2:
kind: arista_ceos
mgmt-ipv4: 172.16.0.2
startup-config: configs/spine2.cfg
# Leaf Switches - VTEP1 (AS 65001)
leaf1:
kind: arista_ceos
mgmt-ipv4: 172.16.0.25
startup-config: configs/leaf1.cfg
leaf2:
kind: arista_ceos
mgmt-ipv4: 172.16.0.50
startup-config: configs/leaf2.cfg
# Leaf Switches - VTEP2 (AS 65002)
leaf3:
kind: arista_ceos
mgmt-ipv4: 172.16.0.27
startup-config: configs/leaf3.cfg
leaf4:
kind: arista_ceos
mgmt-ipv4: 172.16.0.28
startup-config: configs/leaf4.cfg
# Leaf Switches - VTEP3 (AS 65003)
leaf5:
kind: arista_ceos
mgmt-ipv4: 172.16.0.29
startup-config: configs/leaf5.cfg
leaf6:
kind: arista_ceos
mgmt-ipv4: 172.16.0.30
startup-config: configs/leaf6.cfg
# Leaf Switches - VTEP4 (AS 65004)
leaf7:
kind: arista_ceos
mgmt-ipv4: 172.16.0.31
startup-config: configs/leaf7.cfg
leaf8:
kind: arista_ceos
mgmt-ipv4: 172.16.0.32
startup-config: configs/leaf8.cfg
# Host devices - DUAL-HOMED with LACP bonding to MLAG pairs
host1:
kind: linux
mgmt-ipv4: 172.16.0.101
image: ghcr.io/hellt/network-multitool
cap-add:
- NET_ADMIN
exec:
- ip link add bond0 type bond mode 802.3ad
- ip link set dev bond0 type bond xmit_hash_policy layer3+4
- ip link set dev eth1 down
- ip link set dev eth2 down
- ip link set eth1 master bond0
- ip link set eth2 master bond0
- ip link set dev eth1 up
- ip link set dev eth2 up
- ip link set dev bond0 type bond lacp_rate fast
- ip link set dev bond0 up
- ip link add link bond0 name bond0.40 type vlan id 40
- ip link set bond0.40 up
- ip addr add 10.40.40.101/24 dev bond0.40
host2:
kind: linux
mgmt-ipv4: 172.16.0.102
image: ghcr.io/hellt/network-multitool
cap-add:
- NET_ADMIN
exec:
- ip link add bond0 type bond mode 802.3ad
- ip link set dev bond0 type bond xmit_hash_policy layer3+4
- ip link set dev eth1 down
- ip link set dev eth2 down
- ip link set eth1 master bond0
- ip link set eth2 master bond0
- ip link set dev eth1 up
- ip link set dev eth2 up
- ip link set dev bond0 type bond lacp_rate fast
- ip link set dev bond0 up
- ip link add link bond0 name bond0.34 type vlan id 34
- ip link set bond0.34 up
- ip addr add 10.34.34.102/24 dev bond0.34
- ip route add 10.78.78.0/24 via 10.34.34.1
host3:
kind: linux
mgmt-ipv4: 172.16.0.103
image: ghcr.io/hellt/network-multitool
cap-add:
- NET_ADMIN
exec:
- ip link add bond0 type bond mode 802.3ad
- ip link set dev bond0 type bond xmit_hash_policy layer3+4
- ip link set dev eth1 down
- ip link set dev eth2 down
- ip link set eth1 master bond0
- ip link set eth2 master bond0
- ip link set dev eth1 up
- ip link set dev eth2 up
- ip link set dev bond0 type bond lacp_rate fast
- ip link set dev bond0 up
- ip link add link bond0 name bond0.40 type vlan id 40
- ip link set bond0.40 up
- ip addr add 10.40.40.103/24 dev bond0.40
host4:
kind: linux
mgmt-ipv4: 172.16.0.104
image: ghcr.io/hellt/network-multitool
cap-add:
- NET_ADMIN
binds:
- hosts/host4_interfaces:/etc/network/interfaces
exec:
- ip link add bond0 type bond mode 802.3ad
- ip link set dev bond0 type bond xmit_hash_policy layer3+4
- ip link set dev eth1 down
- ip link set dev eth2 down
- ip link set eth1 master bond0
- ip link set eth2 master bond0
- ip link set dev eth1 up
- ip link set dev eth2 up
- ip link set dev bond0 type bond lacp_rate fast
- ip link set dev bond0 up
- ip link add link bond0 name bond0.78 type vlan id 78
- ip link set bond0.78 up
- ip addr add 10.78.78.104/24 dev bond0.78
- ip route add 10.34.34.0/24 via 10.78.78.1
links:
# Spine1 to Leaf connections (underlay fabric)
- endpoints: ["spine1:eth1", "leaf1:eth11"]
- endpoints: ["spine1:eth2", "leaf2:eth11"]
- endpoints: ["spine1:eth3", "leaf3:eth11"]
- endpoints: ["spine1:eth4", "leaf4:eth11"]
- endpoints: ["spine1:eth5", "leaf5:eth11"]
- endpoints: ["spine1:eth6", "leaf6:eth11"]
- endpoints: ["spine1:eth7", "leaf7:eth11"]
- endpoints: ["spine1:eth8", "leaf8:eth11"]
# Spine2 to Leaf connections (underlay fabric)
- endpoints: ["spine2:eth1", "leaf1:eth12"]
- endpoints: ["spine2:eth2", "leaf2:eth12"]
- endpoints: ["spine2:eth3", "leaf3:eth12"]
- endpoints: ["spine2:eth4", "leaf4:eth12"]
- endpoints: ["spine2:eth5", "leaf5:eth12"]
- endpoints: ["spine2:eth6", "leaf6:eth12"]
- endpoints: ["spine2:eth7", "leaf7:eth12"]
- endpoints: ["spine2:eth8", "leaf8:eth12"]
# MLAG Peer Links (leaf pairs)
- endpoints: ["leaf1:eth10", "leaf2:eth10"]
- endpoints: ["leaf3:eth10", "leaf4:eth10"]
- endpoints: ["leaf5:eth10", "leaf6:eth10"]
- endpoints: ["leaf7:eth10", "leaf8:eth10"]
# Host connections - DUAL-HOMED with LACP to MLAG pairs
# host1 dual-homed to leaf1 + leaf2
- endpoints: ["leaf1:eth1", "host1:eth1"]
- endpoints: ["leaf2:eth1", "host1:eth2"]
# host2 dual-homed to leaf3 + leaf4
- endpoints: ["leaf3:eth1", "host2:eth1"]
- endpoints: ["leaf4:eth1", "host2:eth2"]
# host3 dual-homed to leaf5 + leaf6
- endpoints: ["leaf5:eth1", "host3:eth1"]
- endpoints: ["leaf6:eth1", "host3:eth2"]
# host4 dual-homed to leaf7 + leaf8
- endpoints: ["leaf7:eth1", "host4:eth1"]
- endpoints: ["leaf8:eth1", "host4:eth2"]
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