evpn-vxlan-fabric
EVPN/VXLAN Fabric
Primary Backends
pyats-networkpyats-routingpyats-topologynetbox-reconcile
Focus Areas
- VTEP reachability and loopback consistency
- VXLAN VNI to VLAN mapping
- EVPN route types 2, 3, and 5
- Anycast gateway consistency
- Multihoming and Ethernet Segment state
- Underlay routing health vs overlay symptoms
When to Use
- EVPN MAC/IP reachability issues
- Silent hosts or asymmetric flooding complaints
- Anycast gateway or ARP suppression problems
- Leaf-spine underlay failures impacting overlay forwarding
- Data-center fabric audit and documentation
Workflow: Overlay Reachability
- Verify underlay reachability between VTEPs.
- Check BGP EVPN session health and route-type presence.
- Validate VNI mapping, bridge domains, and anycast gateway settings.
- Cross-check local MAC learning against EVPN advertisements.
- Reconcile intended VLAN/VNI mappings against NetBox or ACI intent.
Workflow: Multihoming / ESI Trouble
- Confirm the access device and leaf pair are both healthy.
- Validate Ethernet Segment identifiers and DF election state.
- Check for duplicate MAC movement or split-horizon symptoms.
- Verify LACP state, access VLANs, and host-facing port consistency.
Important Rules
- Always validate the underlay before blaming the overlay
- Do not push fabric config without approved change control
- Use route-type evidence, not assumptions, to explain forwarding
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