FTAS 3.5 Release Explained: Higher Scale Validation, Faster Convergence, and Deeper Multi Tenant Assurance
February 28, 2026
Fabric Test Automation Suite
Summary
FTAS 3.5 introduces major validation enhancements focused on scale expansion, deterministic convergence, and deeper segmentation coverage across EVPN VXLAN data center fabrics. The release strengthens production confidence by validating steady state scale, failure recovery behavior, routing depth, and control plane to data plane consistency. It delivers measurable assurance for high density, multi-tenant environments operating at large route and endpoint scale.
Introduction
Modern data center fabrics must operate at massive scale while recovering predictably from failures. FTAS 3.5 strengthens scale validation, improves convergence assurance, and deepens multi-tenant coverage across EVPN VXLAN deployments.
This release focuses on reducing operational risk by validating how networks behave under stress, failure conditions, and high route density. FTAS 3.5 enables engineering and operations teams to deploy with greater production confidence.
VXLAN and EVPN Scale Validation
EVPN VXLAN fabrics are only as reliable as their control plane and data plane consistency under stress. FTAS 3.5 significantly expands validation coverage to ensure stability at scale.
MAC and ARP Scale Expansion
FTAS 3.5 validates up to 30K MAC and ARP entries. This ensures stability during large scale VM mobility, endpoint churn, and dense multi tenant deployments.
Beyond validating scale numbers, FTAS verifies control plane to data plane consistency. Advertised routes, ARP state, and forwarding entries remain synchronized across VTEPs, eliminating silent inconsistencies between BGP advertisements and hardware forwarding behavior.
EVPN Route Type 2 and ARP Synchronization
FTAS 3.5 performs comprehensive validation of EVPN Route Type 2 propagation and ARP cache synchronization across VTEPs.
Automated state comparison between control plane and forwarding plane tables ensures accurate route installation and forwarding consistency, addressing a major production risk in EVPN VXLAN fabrics.
Convergence and Failure Resiliency
Production networks must be validated for failure scenarios, not just steady state operation.
FTAS 3.5 enhances convergence testing across critical scenarios including VTEP failure recovery, spine node failover convergence, and uplink failure handling.
Each scenario validates recovery timing, forwarding stability, and packet loss characteristics. This ensures predictable behavior during maintenance windows, software upgrades, and unexpected outages.
IPv4 and IPv6 Routing Scale Enhancements
As routing tables grow, deterministic validation becomes essential to maintain system stability.
FTAS 3.5 expands routing validation coverage across IPv4 numbered underlay, IPv6 numbered underlay, and IPv6 unnumbered deployments. IPv6 unnumbered simplifies leaf spine underlay management while maintaining high scale reachability.
Scale validation now includes up to 64K host routes and up to 128K prefix routes, strengthening assurance for high density data centers, service provider edge environments, and large multi-tenant fabrics.
Multi VRF and Segmentation Validation
Modern network architectures require strong segmentation without compromising performance.
FTAS 3.5 introduces validation for port channel sub interfaces and BGP peering across multiple VRFs.
This ensures consistent behavior in segmented designs where uplink aggregation and tenant isolation must coexist reliably across large scale deployments.
Monitoring and Automation Hardening
Validation must extend beyond routing and forwarding into operational visibility and automation reliability.
FTAS 3.5 strengthens legacy monitoring validation using SNMP alongside modern automation workflows. It enhances automation stability to improve repeatability and reduce regression flakiness under high scale and failure conditions.
These improvements provide full stack validation confidence and more deterministic regression runs.
Conclusion
FTAS 3.5 elevates production grade validation for EVPN VXLAN fabrics by expanding scale coverage, verifying convergence under real world failure scenarios, strengthening multi VRF segmentation assurance, and enhancing routing scale validation across IPv4 and IPv6 deployments.
By validating scale, resiliency, and segmentation together, FTAS 3.5 ensures that modern data center fabrics are not only designed for performance but continuously verified for predictable behavior in production environments.
Frequently Asked Questions
What are the biggest changes in FTAS 3.5 compared to previous releases?
Three areas got major upgrades: scale validation, convergence testing, and multi-tenant segmentation coverage. MAC and ARP validation now goes up to 30K entries. Routing scale covers up to 128K prefix routes. Failure recovery scenarios like VTEP failure, spine failover, and uplink failure now get properly tested rather than just assumed to work.
Why does validating up to 30K MAC and ARP entries matter for production EVPN VXLAN fabrics?
Large VM mobility and dense multi-tenant deployments generate massive amounts of MAC and ARP churn. FTAS 3.5 does not just check that the numbers hold up. It verifies that what BGP is advertising matches what is actually in the hardware forwarding tables. Silent mismatches between the control plane and data plane are one of the hardest production bugs to catch and this is what closes that gap.
What failure scenarios does FTAS 3.5 test for convergence and recovery?
Three critical scenarios are covered: VTEP failure recovery, spine node failover convergence, and uplink failure handling. Each one validates recovery timing, forwarding stability, and packet loss characteristics. The point is to know exactly how the network behaves during maintenance windows, software upgrades, and unexpected outages before those events happen in production.
What routing scale improvements shipped in FTAS 3.5?
Validation now covers up to 64K host routes and up to 128K prefix routes across IPv4 numbered underlay, IPv6 numbered underlay, and IPv6 unnumbered deployments. IPv6 unnumbered simplifies leaf-spine underlay management while keeping high scale reachability intact. Teams running high-density data centers, service provider edge, or large multi-tenant fabrics now have assurance at the scale they actually operate.
How does FTAS 3.5 strengthen multi-tenant segmentation validation?
FTAS 3.5 adds validation for port channel sub-interfaces and BGP peering across multiple VRFs. In segmented designs where uplink aggregation and tenant isolation have to coexist, this checks that consistent behaviour holds up at large scale. Tenant isolation breaking quietly under load is a real production risk and this is where that gets caught in testing rather than after go-live.
What monitoring and automation improvements came with FTAS 3.5?
Legacy SNMP monitoring validation got strengthened alongside modern automation workflows. Automation stability improvements reduce regression flakiness under high scale and failure conditions so test runs produce deterministic results rather than inconsistent ones. Full stack validation confidence means the regression suite actually tells teams something useful instead of producing noise.
Why is steady state scale testing not enough on its own for production EVPN VXLAN fabrics?
Networks that pass steady state tests can still fall apart during a failure event. FTAS 3.5 explicitly validates failure recovery behaviour because that is where most production incidents actually happen. Knowing the fabric handles 128K routes cleanly is useful. Knowing it converges predictably after a spine goes down during a software upgrade is what actually builds production confidence.
Who benefits most from the improvements in FTAS 3.5?
Engineering and operations teams running high-density data centers, service provider edge environments, and large multi-tenant fabrics get the most out of it. Any team that needs to deploy EVPN VXLAN at serious scale and cannot afford silent control plane to data plane inconsistencies showing up in production is exactly who this release was built for.
Explore how FTAS 3.5 strengthens large scale EVPN VXLAN validation with deeper convergence testing and expanded routing assurance.
