Stacking and Virtual Chassis: High Availability for Switches
·2 min read·271 words
Stacking and Virtual Chassis for switch high availability: Cisco StackWise-480, Juniper Virtual Chassis, Aruba VSF/VSX, and FortiSwitch Stacking. Architecture, failover, and ISSU upgrades. Expert 2026 guide.
Technologies
- Cisco StackWise-480: 480 Gbps bandwidth, up to 8 switches (C9300)
- Cisco StackWise Virtual: 2× C9500 switches operating as 1 logical unit
- Juniper Virtual Chassis: 10 EX switches, 320 Gbps
- Aruba VSF: 10 switches, 400 Gbps (CX 6300)
- Aruba VSX: 2 switches (CX 8325, 8400)
- FortiSwitch Stacking: via FortiGate FortiLink
Benefits
- Management: 1 logical entity instead of N
- High availability: failover in <1s
- Cross-switch LACP (MC-LAG without the complexity)
- ISSU (In-Service Software Upgrade)
- Scalability: add switches without redesigning the network
StackWise-480 Configuration
- Stack cables: STACK-T1-50CM or 1M
- Ring topology required
- Master election based on priority + MAC
- switch 1 priority 15 (set highest)
- show switch: view stack state
Juniper Virtual Chassis
- 2-10 EX switches managed as 1
- VCP ports (Virtual Chassis Ports): dedicated 40G links
- Master / backup / linecard roles
- Configuration: request virtual-chassis mode network-port
- show virtual-chassis
Aruba VSF
- Virtual Switching Framework (different from VSX)
- 10× CX 6200/6300 switches
- VSF links: dedicated 10G/25G links
- Configuration: vsf enable + vsf member 1
- Commander on CX: Commander + standby + members
Aruba VSX
- 2 chassis operating as 1 (vs multi-chassis VSF)
- For core/aggregation deployments
- ISL (Inter-Switch Link): 4× 100G
- KeepAlive: OOB link
- Active-active LAG across both chassis
ISSU (In-Service Software Upgrade)
- Firmware upgrades without downtime
- Rolling upgrade: upgrade 1 switch at a time within the stack
- Compatibility: specific ISSU-compatible versions
- Limitations: some major upgrades do not support ISSU
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Stacking/Virtual Chassis deployment. Cisco StackWise, Juniper VC, Aruba VSF/VSX, and FortiSwitch. Quote within 48 hours.