Cisco Catalyst C9300-48UXB-E Full Official English Description
1. Product Brief Overview
The Cisco Catalyst C9300-48UXB-E is a 1 rack-unit (1RU) stackable higher-scale deep-buffer Multigigabit UPOE enterprise access switch within Catalyst 9300 fixed uplink portfolio, factory pre-installed with perpetual Network Essentials base software license.
The “UXB” identifier represents Multigigabit UPOE with higher-scale ASIC and doubled deep packet buffer, delivering enlarged MAC, ACL and multicast table capacity compared to standard C9300-48UX non-deep-buffer models. It carries identical copper port hardware and fixed SFP+ uplink layout as C9300-48UXB-A, only differentiated by the entry-level Network Essentials license tier.
This switch is designed for mid-density campus access, branch offices, education classrooms and retail sites with bursty wireless, IP camera and IoT traffic that require deep congestion buffering, without demand for full advanced routing, SD-Access or premium security functions. It runs Cisco IOS XE, supporting StackWise-480 stacking and StackPower shared PoE power pooling.
2. Port Hardware Specification
Downlink Ports (48× Multigigabit Shielded RJ45 UPOE)
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Auto-negotiation speeds: 100 Mbps / 1 Gbps / 2.5 Gbps / 5 Gbps / 10 Gbps Multigigabit Ethernet
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Port speed partition: 36 ports maximum 2.5 Gbps throughput; 12 dedicated high-speed ports support full 10 Gbps operation over Cat5e / Cat6A twisted pair cabling
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PoE standard: Cisco proprietary UPOE (Universal Power over Ethernet), up to 60W DC power output per port
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Connector type: Shielded RJ45, full 4-pair power delivery for high-power endpoints
Fixed Integrated Uplink Interfaces (Non-modular built-in)
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4 fixed SFP+ uplink slots, compatible with 1G SFP and 10G SFP+ copper / optical transceivers
Management & Auxiliary Interfaces
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1× RJ45 out-of-band Ethernet management port
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1× RJ45 serial console port, compatible with USB-C console adapter accessory
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1× USB Type-A storage port for offline firmware upload, config backup and log file export
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Rear StackWise-480 dedicated stacking ports for inter-switch logical stacking ring
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Rear StackPower power stacking ports to aggregate PoE power budget across stacked members
3. Switching & Forwarding Performance (Higher-Scale Deep Buffer ASIC)
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Full-duplex non-blocking switching capacity: 580 Gbps
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Combined IPv4 / IPv6 packet forwarding rate: 431.54 Mpps (Million Packets Per Second)
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Maximum MAC address table entries: 128,000 (2× capacity of standard UX models)
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Maximum IPv4 unicast routes (Network Essentials limit): 10,000 static / RIP / EIGRP Stub routes
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Maximum IPv6 unicast routes: 4,000
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Layer 2 / Layer 3 multicast group capacity: 32,000 entries
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Expanded ACL entry scale for heavy traffic filtering policies
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Dynamic shared deep packet buffer pool: 32 MB (double the 16 MB buffer of baseline C9300-48UX variants), minimizes packet drops during bursty Wi-Fi, video surveillance and IoT peak loads
4. Memory & Storage
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System DRAM: 8 GB DDR4
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Onboard flash storage: 4 GB eMMC, stores IOS XE system images, startup/running configurations and system event logs
5. PoE & Power Supply Specifications
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Factory default PSU: PWR-C1-1100WAC-P auto-ranging AC power supply
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Total available UPOE power budget with single 1100W PSU: 490W
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Dual hot-swappable redundant AC power supply bays for power fault tolerance
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StackPower technology: Aggregate PoE power resources across up to 8 stacked switches, dynamically redistribute power to high-consumption 60W UPOE endpoints
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AC input voltage range: 100–240 VAC, auto-sensing 50/60 Hz
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Multi-mode per-port power delivery: IEEE 802.3af PoE (15.4W), IEEE 802.3at PoE+ (30W), Cisco UPOE (60W)
6. Stacking Capability
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Stacking architecture: Cisco StackWise-480
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Full-duplex ring stacking bandwidth: 480 Gbps
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Maximum stack members: Up to 8 mixed Catalyst 9300 higher-scale and standard switches in one logical stack
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Supported high availability functions: Stateful Switchover (SSO), Nonstop Forwarding (NSF), basic In-Service Software Upgrade (ISSU)
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Redundant ring topology provides automatic failover against stacking cable link failures
7. Physical Mechanical Specifications
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Form factor: Standard 1RU rack-mount chassis
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Dimensions (H × W × D): 1.73 in × 17.5 in × 22.2 in (4.4 cm × 44.5 cm × 56.4 cm)
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Unit weight with single 1100W PSU installed: ~9.3 kg / 20.5 lbs
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Front panel indicators: Per-port link/activity LED, global system power LED, stack status LED, PoE fault alarm LED
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Rear panel layout: StackWise stacking connectors, StackPower power stacking ports, dual PSU slots, dual hot-swappable variable-speed fan trays
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Cooling system: Redundant smart fan trays with temperature-based automatic speed adjustment for quiet, efficient thermal management
8. Software License Tier: Network Essentials (-E Suffix)
Network Essentials is the base perpetual license preloaded on C9300-48UXB-E, delivering fundamental switching features with clear restrictions on advanced routing, security, telemetry and automation functions.
Included Core Feature Set
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Complete Layer 2 switching suite: 4096 VLANs, STP/RSTP/MSTP, LACP, VTPv3, Private VLANs, Voice VLAN, jumbo frame support up to 9198 bytes
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Limited basic Layer 3 routing: Static routing, RIP, EIGRP Stub, restricted OSPF with route entry caps
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Entry-level endpoint security: 802.1X authentication, MAB, web-based authentication, port security, DHCP Snooping, DAI, IP Source Guard, 128-bit MACsec link encryption
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Fundamental QoS tools: Class-based marking, policing, standard multi-queue scheduling for voice, video and IoT traffic
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Basic monitoring: SPAN / RSPAN, limited Flexible NetFlow without Encrypted Traffic Analytics (ETA)
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Baseline high availability: SSO, NSF, cross-stack LACP aggregation, simplified ISSU workflow
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Limited programmability: Basic NETCONF/YANG, lightweight Python Guest Shell, partial Cisco DNA Center zero-touch provisioning integration
Features Not Native to Network Essentials (Require Upgrade to Network Advantage)
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Full enterprise advanced routing protocols: Full-scale OSPF, EIGRP, BGP, PIM sparse/dense multicast, Policy-Based Routing (PBR)
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SD-Access fabric campus virtualization, TrustSec SGT end-to-end segmentation
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Hardware-accelerated AES-256 MACsec encryption across all ports
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Encrypted Traffic Analytics (ETA), full 64k Flexible NetFlow flow monitoring entries
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Hierarchical QoS (HQoS), IP SLA responder, Embedded Event Manager (EEM) automation
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Full automation stack: Complete RESTCONF APIs, advanced DNA Center assurance, Application Visibility & Control (AVC)
9. Base Operating System & Core Security Capabilities
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Operating System: Cisco IOS XE 17.x release train optimized for higher-scale deep-buffer UXB ASIC
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Platform security foundations: Secure Boot, firmware digital signature validation, encrypted local credentials, TACACS+/RADIUS AAA authentication, Control Plane Policing (CoPP)
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Mobility & IoT optimizations: Fast Wi-Fi client roaming, AP traffic priority queuing, configurable UPOE power scheduling
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Manageability suite: SNMP v3, SSHv2, TLS 1.3 HTTPS, local syslog, remote log forwarding, zero-touch provisioning (ZTP)
10. Typical Deployment Scenario
The C9300-48UXB-E targets small-to-medium branch offices, K12 classroom buildings, low-density retail chains and basic campus access floors with high-burst wireless and surveillance traffic. Its 32 MB deep packet buffer eliminates congestion loss during simultaneous peak connections of Wi-Fi 6/6E APs and multi-megapixel IP cameras, while expanded MAC table capacity supports thousands of concurrent wired/wireless endpoints per stack.
Fixed 4×SFP+ uplinks deliver cost-effective 10G fiber aggregation to upstream distribution switches. The Network Essentials license keeps upfront cost low for environments that only require basic Layer 2 switching and minimal Layer 3 routing, without demands for fabric segmentation, advanced inter-site routing or full enterprise security analytics suites. Hardware can be upgraded to Network Advantage license later to unlock premium SD-Access, routing and security features as network scale grows.
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