Extreme Fabric Connect

Why Fabric Connect?

Segmentation is the part of the IT infrastructure that everybody agrees with and few maintain, because on a classic network it means touching every switch for every change. A fabric moves that work to the edge — which is the entire argument for this class of technology, and worth testing against your own change process.

Traditional networks require VLAN config on every switch. Spanning Tree blocks redundant paths. Segmentation is a manual process prone to errors. Network changes require touching every device.

Fabric Connect is software-defined networking based on IEEE 802.1aq (SPB). Automatic segmentation - VLANs defined centrally, propagated automatically. All paths active - no Spanning Tree blocking. Zero config per switch for new services.

How does it work?

SPB Foundation

IEEE 802.1aq standard:

• Shortest Path Bridging
• IS-IS control plane
• All paths active
• Sub-second failover
• Loop-free by design

Service Abstraction

Services independent of topology:

• I-SID (Service Instance ID)
• Define once, propagate everywhere
• L2 and L3 services
• Automatic path calculation
• Zero per-switch config

Elastic Edge

Fabric to the edge:

• Fabric Attach for edge devices
• AP, IoT, cameras auto-join
• Dynamic VLAN assignment
• Simplified edge deployment
• Consistent policy

Main features

Automatic Fabric

• Self-configuring topology
• Device discovery
• Path optimization
• Load balancing
• Built-in resilience

Hyper-Segmentation

• Thousands of segments
• Microsegmentation ready
• Policy-based
• Application isolation
• Zero Trust foundation

Multi-tenancy

• Isolated tenant networks
• Shared infrastructure
• Service provider ready
• Campus multi-tenant
• Secure separation

Operations

• Simplified troubleshooting
• Visual topology maps
• Service tracing
• Centralized management
• Fabric-wide visibility

Architecture

             Fabric Core (SPB)
                   │
    ┌──────────────┼──────────────┐
    │              │              │
 Switch A      Switch B      Switch C
    │              │              │
 ┌──┴──┐       ┌──┴──┐       ┌──┴──┐
 │I-SID│       │I-SID│       │I-SID│
 │ 100 │       │ 100 │       │ 200 │
 └─────┘       └─────┘       └─────┘

 Services auto-propagate across fabric

Fabric Connect vs Traditional

Aspect	Fabric Connect	Traditional
Segmentation	Automatic (I-SID)	Manual VLANs
Path usage	All paths active	STP blocked
Failover	Sub-second	30-50 seconds
New VLAN	Define once	Config all switches
Complexity	Linear	Exponential

Who is it for?

• Large enterprise with multiple locations
• University campuses
• Data center operators
• Service providers with multi-tenant needs

Benefits

For IT: a new service configured at the edge instead of on every switch, no per-switch VLAN setup, simpler operations

For security: Native segmentation, hyper-segmentation ready, Zero Trust foundation

For business: Faster service deployment, reduced outages, lower OpEx

Specification

Standard	IEEE 802.1aq (SPB)
Control Plane	IS-IS
Segments	16 million I-SIDs
Failover	Sub-second

FAQ

What is SPB? Shortest Path Bridging (IEEE 802.1aq). Standard replacing Spanning Tree. All paths active, loop-free.

How is it different from VXLAN? SPB is IEEE standard, simpler in operation. VXLAN requires overlay management. Fabric Connect = SPB underlay.

Can I have thousands of VLANs? Yes. I-SID scales to 16 million. Practically unlimited segmentation.

Which switches support Fabric Connect? 5000 and 7000 series. 4000 series as edge with Fabric Attach.

What is Fabric Attach? Protocol for edge devices (AP, switches) to automatically join fabric and receive proper VLAN.

How fast is failover? Sub-second. IS-IS convergence much faster than STP (30-50 sec).

Does Fabric Connect require ExtremeCloud IQ? Not required, but recommended. ExtremeCloud IQ provides visibility and fabric management.

How to migrate from traditional network? Gradual migration. Fabric Connect can coexist with legacy. Phased approach.

Does it support L3 routing? Yes. L2 and L3 services. IP shortcuts for optimal routing in fabric.

What about support? Extreme Networks support for software. nFlo offers fabric design, migration planning, and deployment.