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-# Quick Diagnostic: Why Hosts Weren't Talking
-
-## The Problem
-
-You were getting **empty MAC tables and no ping replies** when testing end-to-end connectivity between hosts. The root cause was **VLAN tagging mismatch** between hosts and leaf switches.
-
-## The Mismatch Explained
-
-### ❌ OLD Configuration (Broken)
-
-**Hosts were sending untagged traffic:**
-```yaml
-host1:
-  exec:
-    - ip link add bond0 type bond mode balance-rr
-    - ip link set eth1 master bond0
-    - ip link set eth2 master bond0
-    - ip link set bond0 up
-    - ip addr add 10.40.40.101/24 dev bond0    # ← UNTAGGED traffic!
-```
-
-**Leaf switches expected VLAN-tagged traffic:**
-```
-interface Port-Channel1
-   switchport mode access
-   switchport access vlan 40     # ← Expecting tagged VLAN 40!
-   mlag 1
-```
-
-### Traffic Flow (Broken):
-```
-Host1 (untagged)
-  ↓
-eth1/eth2 (bonds)
-  ↓
-Leaf1 Port-Channel1 (access VLAN 40)
-  ↓
-Traffic dropped because VLAN doesn't match!
-  ↗ No MAC learning
-  ↗ No connectivity
-```
-
----
-
-## ✅ NEW Configuration (Fixed)
-
-**Hosts now send VLAN-tagged traffic:**
-```yaml
-host1:
-  exec:
-    - ip link add bond0 type bond mode balance-rr
-    - ip link set eth1 master bond0
-    - ip link set eth2 master bond0
-    - ip link set bond0 up
-    # Create VLAN 40 subinterface
-    - 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  # ← TAGGED traffic!
-```
-
-**Leaf switches expect VLAN-tagged traffic:**
-```
-interface Port-Channel1
-   switchport mode access
-   switchport access vlan 40     # ← Now matches!
-   mlag 1
-```
-
-### Traffic Flow (Fixed):
-```
-Host1 (VLAN 40 tagged)
-  ↓
-bond0.40 interface (sends tagged frames)
-  ↓
-eth1/eth2 (carries tagged traffic)
-  ↓
-Leaf1 Port-Channel1 (access VLAN 40)
-  ↓
-Frames untagged and placed in VLAN 40
-  ↓
-Switches forward in VLAN 40
-  ↓
-VXLAN encapsulation for remote VTEP
-  ↓
-✓ MAC learning works
-  ✓ Connectivity established
-```
-
----
-
-## VLAN Tagging Mapping
-
-| Host | Interface | VLAN Tag | Purpose | Test |
-|------|-----------|----------|---------|------|
-| host1 | bond0.40 | 40 | L2 VXLAN test | Ping host3 |
-| host2 | bond0.34 | 34 | L3 VXLAN (VRF gold) VLAN | Ping host4 |
-| host3 | bond0.40 | 40 | L2 VXLAN test | Ping host1 |
-| host4 | bond0.78 | 78 | L3 VXLAN (VRF gold) VLAN | Ping host2 |
-
----
-
-## Why This Works
-
-### Layer 2 Switching Basics
-
-When a **Linux host sends traffic on a VLAN subinterface** (e.g., `bond0.40`):
-1. The interface **adds a VLAN tag (802.1Q)** to the Ethernet frame
-2. Frame contains: `[Dest MAC][Source MAC][**VLAN Tag (40)**][Type][Data]`
-
-When a **Leaf switch receives the tagged frame**:
-1. It reads the VLAN tag (40)
-2. The frame matches the port's access VLAN (40)
-3. Frame is **untagged** and forwarded in VLAN 40
-4. Switch learns MAC and floods/forwards appropriately
-
----
-
-## Testing the Fix
-
-```bash
-# 1. Verify host VLAN interface exists
-docker exec clab-arista-evpn-fabric-host1 ip -d link show bond0.40
-# Expected: vlan protocol 802.1Q id 40 <BROADCAST,MULTICAST,UP,LOWER_UP>
-
-# 2. Verify host has IP on VLAN interface
-docker exec clab-arista-evpn-fabric-host1 ip addr show bond0.40
-# Expected: inet 10.40.40.101/24 dev bond0.40
-
-# 3. Ping the gateway (virtual router on Leaf)
-docker exec clab-arista-evpn-fabric-host1 ping -c 1 10.40.40.1
-# Expected: Should get reply from leaf VLAN40 gateway
-
-# 4. Ping remote host
-docker exec clab-arista-evpn-fabric-host1 ping -c 4 10.40.40.103
-# Expected: 4/4 packets successful
-```
-
----
-
-## Key Files Changed
-
-1. **evpn-lab.clab.yml**
-   - Updated all 4 host definitions with VLAN subinterface configuration
-   - Each host now creates and configures its own VLAN tagged interface
-
-2. **END_TO_END_TESTING.md** (new)
-   - Comprehensive testing guide for all connectivity scenarios
-   - Troubleshooting procedures
-   - Expected results validation
-
----
-
-## Why VLAN Tagging is Required Here
-
-The topology uses **access mode port-channels on leafs** because:
-
-1. **Each host has a single VLAN** (no trunk needed)
-2. **VLAN tagging from the host side** is cleaner than reconfiguring leaf ports
-3. **Matches production design** where hosts are single-VLAN attached
-4. **Avoids manual leaf reconfiguration** after deployment
-
-Alternative approach (NOT used):
-- Could change leaf port-channels to trunk mode
-- Would require manually configuring allowed VLANs
-- More complex and less automated
-
-This is the automated, repeatable approach that avoids manual post-deployment configuration.