Catalyst 9300 \/ 9300X<\/strong><\/td>\n| StackWise-480 \/ StackWise-1T<\/td>\n | 8 switches<\/strong><\/td>\n| 480 Gbps (9300) \/ 1 Tbps (9300X)<\/td>\n | Integrated stack ports; cables required<\/td>\n<\/tr>\n | \nCatalyst 9300L<\/strong><\/td>\n| StackWise-320<\/td>\n | 8 switches<\/strong><\/td>\n| 320 Gbps<\/td>\n | Optional kit (C9300L-STACK-KIT<\/code>)<\/td>\n<\/tr>\n\nCatalyst 9200<\/strong><\/td>\n| StackWise-160<\/td>\n | 8 switches<\/strong><\/td>\n| 160 Gbps<\/td>\n | Optional kit (C9200-STACK-KIT<\/code>)<\/td>\n<\/tr>\n\nCatalyst 9200L<\/strong><\/td>\n| StackWise-80<\/td>\n | 8 switches<\/strong><\/td>\n| 80 Gbps<\/td>\n | Optional kit (C9200L-STACK-KIT<\/code>)<\/td>\n<\/tr>\n\nCatalyst 3850<\/strong><\/td>\n| StackWise-480<\/td>\n | 9 switches<\/strong><\/td>\n| 480 Gbps<\/td>\n | Integrated stack ports; cables required<\/td>\n<\/tr>\n | \nCatalyst 3650<\/strong><\/td>\n| StackWise-160<\/td>\n | 9 switches<\/strong><\/td>\n| 160 Gbps<\/td>\n | Optional module (C3650-STACK-KIT<\/code>)<\/td>\n<\/tr>\n\nCatalyst 3750-X \/ 3750-E<\/strong><\/td>\n| StackWise Plus<\/td>\n | 9 switches<\/strong><\/td>\n| 64 Gbps<\/td>\n | Integrated stack ports; cables required<\/td>\n<\/tr>\n | \nCatalyst 2960-X \/ 2960-XR<\/strong><\/td>\n| FlexStack-Plus<\/td>\n | 8 switches<\/strong><\/td>\n| 80 Gbps<\/td>\n | Optional module (C2960X-STACK<\/code>)<\/td>\n<\/tr>\n\nCatalyst 2960-S<\/strong><\/td>\n| FlexStack<\/td>\n | 4 switches<\/strong><\/td>\n| 40 Gbps<\/td>\n | Optional module (CAB-STK<\/code>)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nWhile physical backplane stacking dominates the access layer (closets and Intermediate Distribution Frames), enterprise aggregation and core tiers require a different approach to unified control: StackWise Virtual.<\/p>\n
\n<\/span>Physical StackWise vs. StackWise Virtual: Access vs. Core Stacking Limits<\/span><\/h2>\nWhen scaling beyond access closets, traditional backplane stacking becomes physically impractical due to cable length limitations. Cisco addresses this by separating stacking into two paradigms: physical backplane StackWise (up to 8 or 9 members) and StackWise Virtual (2 members).<\/p>\n StackWise Virtual (SVL) is designed for distribution and core layers. It replaces proprietary stack cables with standard 10G, 25G, 40G, or 100G Ethernet links, grouping two modular or fixed switches into a single logical device across separate physical locations.<\/p>\n \n\n\n| Feature \/ Criteria<\/th>\n | Physical StackWise (e.g., StackWise-480\/160)<\/th>\n | Cisco StackWise Virtual (SVL)<\/th>\n<\/tr>\n<\/thead>\n | \n\nMaximum Stack Members<\/strong><\/td>\n8 switches<\/strong> (Catalyst 9200\/9300) or 9 switches<\/strong> (Catalyst 3850)<\/td>\n2 switches<\/strong> (fixed virtual pair)<\/td>\n<\/tr>\n\nSupported Platforms<\/strong><\/td>\n| Catalyst 9200, 9300, 3850, 3650, 2960-X<\/td>\n | Catalyst 9400, 9500, 9600, select 9300X models<\/td>\n<\/tr>\n | \nInterconnect Medium<\/strong><\/td>\n| Dedicated, proprietary StackWise cables<\/td>\n | Standard Ethernet optics\/cables (10G\/25G\/40G\/100G)<\/td>\n<\/tr>\n | \nPhysical Distance<\/strong><\/td>\n| Max 3 meters (confined to same rack or adjacent racks)<\/td>\n | Meters to kilometers (spans separate rooms, floors, or data halls)<\/td>\n<\/tr>\n | \nDeployment Layer<\/strong><\/td>\n| Campus Access Layer (wiring closets, high port density)<\/td>\n | Campus Distribution and Core Layers<\/td>\n<\/tr>\n | \nTopology Design<\/strong><\/td>\n| Closed-loop dual ring with Spatial Reuse Protocol (SRP)<\/td>\n | Point-to-point StackWise Virtual Link (SVL) with DAD<\/td>\n<\/tr>\n | \nControl Plane Redundancy<\/strong><\/td>\n| 1 Active, 1 Standby, remaining units are Members (SSO)<\/td>\n | 1 Active, 1 Standby (SSO over SVL); dual forwarding<\/td>\n<\/tr>\n | \nBandwidth Scaling<\/strong><\/td>\n| Fixed backplane speed (80 Gbps to 1 Tbps total ring throughput)<\/td>\n | Variable; determined by the number and speed of SVL uplinks<\/td>\n<\/tr>\n | \nPower Sharing<\/strong><\/td>\n| Supports Cisco StackPower (up to 4 members pooled)<\/td>\n | Not supported; switches maintain independent power supplies<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Before procuring stack cables or designing a high-density closet, you must verify what hardware models can legally coexist within the same stack ring.<\/p>\n
\n<\/span>Compatibility Rules: Can You Mix Different Cisco Switch Models in a Stack?<\/span><\/h2>\nA frequent source of deployment failure is attempting to stack switches that do not share architectural parity. Cisco enforces strict boundaries regarding which hardware, software, and licensing configurations can form a stack.<\/p>\n <\/span>Can I stack switches from different Catalyst families together?<\/span><\/h3>\nNo.<\/strong> You cannot stack across different product lines. For example, you cannot stack a Catalyst 9200 with a Catalyst 9300, nor can you stack a Catalyst 3850 with a Catalyst 3650. Their internal switching ASICs, packet headers, and stack ring protocols are fundamentally incompatible.<\/p>\n<\/span>Can I mix standard modular switches with their “L” (fixed uplink) counterparts?<\/span><\/h3>\nNo.<\/strong> You cannot stack a Catalyst 9300 with a Catalyst 9300L, nor can you stack a Catalyst 9200 with a Catalyst 9200L.
\n* The Catalyst 9300 uses built-in StackWise-480 ports, whereas the 9300L uses external StackWise-320 modules.
\n* The Catalyst 9200 uses StackWise-160, while the 9200L runs StackWise-80. Because the backplane hardware and transmission speeds differ, the stack ring cannot initialize.<\/p>\n<\/span>Can I mix Catalyst 9300 and Catalyst 9300X models in the same stack?<\/span><\/h3>\nYes.<\/strong> This is an officially supported exception. A Catalyst 9300 (StackWise-480) and a Catalyst 9300X (StackWise-1T) can join the same stack. However, the entire stack ring throttles down to StackWise-480<\/strong>. The 9300X loses its 1 Tbps backplane capability across the shared ring, matching the performance of the lowest common denominator.<\/p>\n<\/span>Can I mix 24-port, 48-port, PoE+, UPOE, and multigigabit models within the same family?<\/span><\/h3>\nYes.<\/strong> Within the same product line (e.g., all standard 9300 models), you can freely mix port configurations. A single stack can contain a 24-port data-only switch, a 48-port PoE+ switch, a 24-port UPOE multigigabit switch, and an SFP+ fiber access switch without restriction.<\/p>\n<\/span>What are the software and licensing restrictions for switch stacking?<\/span><\/h3>\nEvery switch in a physical stack must comply with two rules:
\n1. Identical Software Version:<\/strong> All switches must run the exact same Cisco IOS-XE version and train. A version mismatch causes the newly added switch to enter a V-Mismatch<\/code> state, disabling its data plane until upgraded.
\n2. Identical License Level:<\/strong> You cannot mix Network Essentials with Network Advantage. Every member must be licensed at the same tier to ensure identical Layer 2\/Layer 3 feature availability across the unified control plane.<\/p>\n
\n<\/span>Stacking Hardware Matrix: Required Modules, Adapters, and Cables<\/span><\/h2>\nBuilding a functional Cisco switch stack requires matching each switch SKU with its correct stacking kit and cable assembly. Stacking accessories are typically not bundled by default and must be explicitly ordered.<\/p>\n ========================================================================================\nCISCO CATALYST STACKING HARDWARE MATRIX\n========================================================================================\n\nPLATFORM: Cisco Catalyst 9200 Series (Modular Uplinks)\n - Technology: StackWise-160\n - Stack Kit SKU: C9200-STACK-KIT= (Includes 2x Data Stack Adapters, 1x 0.5m Cable)\n - Data Cables:\n * STACK-T4-50CM (0.5 Meter \/ 1.6 ft)\n * STACK-T4-1M (1.0 Meter \/ 3.3 ft)\n * STACK-T4-3M (3.0 Meter \/ 9.8 ft)\n\nPLATFORM: Cisco Catalyst 9200L Series (Fixed Uplinks)\n - Technology: StackWise-80\n - Stack Kit SKU: C9200L-STACK-KIT= (Includes 2x Data Stack Adapters, 1x 0.5m Cable)\n - Data Cables: Uses same Type 4 cables as 9200 (STACK-T4-50CM, STACK-T4-1M, STACK-T4-3M)\n\nPLATFORM: Cisco Catalyst 9300 Series (Modular Uplinks) & Catalyst 9300X\n - Technology: StackWise-480 (9300) \/ StackWise-1T (9300X)\n - Stack Ports: Built-in integrated ports (No modular adapter required)\n - Data Cables:\n * STACK-T1-50CM (0.5 Meter \/ 1.6 ft)\n * STACK-T1-1M (1.0 Meter \/ 3.3 ft)\n * STACK-T1-3M (3.0 Meter \/ 9.8 ft)\n\nPLATFORM: Cisco Catalyst 9300L Series (Fixed Uplinks)\n - Technology: StackWise-320\n - Stack Kit SKU: C9300L-STACK-KIT= (Includes 2x Data Stack Adapters, 1x 0.5m Cable)\n - Data Cables:\n * STACK-T3-50CM (0.5 Meter \/ 1.6 ft)\n * STACK-T3-1M (1.0 Meter \/ 3.3 ft)\n * STACK-T3-3M (3.0 Meter \/ 9.8 ft)\n\nPLATFORM: Cisco Catalyst 3850 Series\n - Technology: StackWise-480\n - Stack Ports: Built-in integrated ports\n - Data Cables: Uses Type 1 cables (STACK-T1-50CM, STACK-T1-1M, STACK-T1-3M)\n\nPLATFORM: Cisco Catalyst 2960-X \/ 2960-XR Series\n - Technology: FlexStack-Plus\n - Stack Module SKU: C2960X-STACK= (FlexStack-Plus hot-swappable module)\n - Data Cables:\n * CAB-STK-E-0.5M (0.5 Meter)\n * CAB-STK-E-1M (1.0 Meter)\n * CAB-STK-E-3M (3.0 Meter)\n\n========================================================================================\nCISCO STACKPOWER SPECIFICATION (CATALYST 9300 MODULAR & CATALYST 3850)\n========================================================================================\n - Max Power Pool Members: 4 physical switches\n - Cables Required:\n * CAB-SPWR-30CM (30 cm StackPower cable - intra-rack)\n * CAB-SPWR-150CM (150 cm StackPower cable - cross-rack or end-of-stack loop)\n<\/code><\/pre>\nImportant Architecture Note on StackPower:<\/strong> Although the data stack for the Catalyst 9300 or 3850 supports up to 8 or 9 switches<\/strong>, the StackPower ring supports a maximum of 4 switches<\/strong>. If you deploy an 8-switch Catalyst 9300 data stack with StackPower, you must divide the physical switches into two separate 4-switch power pools<\/strong>.<\/p><\/blockquote>\n
\n<\/span>Step-by-Step Configuration Guide: Cabling, Numbering, and CLI Verification<\/span><\/h2>\nOnce compatible hardware and cables are secured, the stack must be physically linked into a closed-loop ring and configured via Cisco IOS-XE.<\/p>\n <\/span>Step 1: Cable the Stack in a Closed-Loop Ring<\/span><\/h3>\nPhysical StackWise relies on counter-rotating rings to provide full bandwidth and failover resiliency.<\/p>\n \n- Connect Port 1<\/strong> of Switch 1 to Port 2<\/strong> of Switch 2.<\/li>\n
- Connect Port 1<\/strong> of Switch 2 to Port 2<\/strong> of Switch 3.<\/li>\n
- Continue this sequential pattern down to the final switch.<\/li>\n
- Complete the loop: Connect Port 1<\/strong> of the final switch back to Port 2<\/strong> of Switch 1.<\/li>\n<\/ol>\n
Connecting all switches in a complete ring ensures that if any single cable or switch fails, the stack drops to half-bandwidth ring mode without losing data transmission or splitting into isolated islands.<\/p>\n <\/span>Step 2: Set Switch Priorities (Elect the Active and Standby)<\/span><\/h3>\nBy default, all switches boot with a priority of 1. Configure the designated primary switch with a priority of 15<\/strong> (highest possible) and your backup switch with 14<\/strong>.<\/p>\nSwitch# configure terminal\nSwitch(config)# switch 1 priority 15\nSwitch(config)# switch 2 priority 14\nSwitch(config)# exit\nSwitch# write memory\n<\/code><\/pre>\n<\/span>Step 3: Renumber Stack Members (Optional)<\/span><\/h3>\nIf a newly joined switch assumes an incorrect member number (e.g., ports showing as GigabitEthernet3\/0\/1<\/code> instead of GigabitEthernet2\/0\/1<\/code>), renumber the unit:<\/p>\nSwitch# switch 3 renumber 2\nWARNING: Changing the switch number may result in a configuration change for that switch.\nDo you want to continue?[y\/n] [confirm] y\n<\/code><\/pre>\nNote: A switch must be reloaded for its new member number to take effect.<\/em><\/p>\n<\/span>Step 4: Pre-Provision Offline Switches<\/span><\/h3>\nTo configure interfaces on stack members before they arrive or are cabled, pre-provision the chassis on the Active switch:<\/p>\n Switch(config)# switch 3 provision c9300-48p\nSwitch(config)# switch 4 provision c9300-24t\n<\/code><\/pre>\n<\/span>Step 5: Verify Stack Health and Topology<\/span><\/h3>\nAfter cabling and powering on all members, execute these essential verification commands from privileged EXEC mode:<\/p>\n 1. Verify Member Roles and Operational State<\/h4>\nSwitch# show switch\nSwitch\/Stack Mac Address : d4c1.9e12.aa00 - Local Mac Address\nMac persistency wait time: Indefinite\n H\/W Current\nSwitch# Role Mac Address Priority Version State\n------------------------------------------------------------\n*1 Active d4c1.9e12.aa00 15 V02 Ready\n 2 Standby d4c1.9e12.bb00 14 V02 Ready\n 3 Member d4c1.9e12.cc00 1 V02 Ready\n 4 Member d4c1.9e12.dd00 1 V02 Ready\n<\/code><\/pre>\n
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