| WS-C4500X-16SFP+ Specification |
| Expansion Module (Optional) | 8x10 GE SFP+/SFP - C4KX-NM-8SFP+ |
| Management Port | 10/100/1000 Base-T |
| USB Port | Type A (storage and boot) up-to 4 GB |
| Dual Power Supply | Yes |
| Field Replaceable Fans | Yes (5 fans) |
| Fan Redundancy | No performance impact with single fan failure |
| System Throughput | Up to 800 Gbps |
| IPv4 Routing in Hardware | Up to 250 Mpps |
| IPv6 Routing in Hardware | Up to 125 Mpps |
| L2 Bridging in Hardware | Up to 250 Mpps |
| Media Access Control (MAC) Entries | 55K |
| Forwarding Entries | 16x10 GE Port Base SKU: IPv4: 64K, IPv6: 32K |
| Flexible Netflow Entries | 128K |
| Switched Port Analyzer (SPAN), Remote Switched Port Analyzer (RSPAN) | 8 line rate bidirectional sessions (ingress and egress) |
| Total VLANs | 4094 |
| Total Switched Virtual Interfaces (SVIs) | 4094 |
| IGMP groups | 32K |
| Multicast routes | 16x10 GE Port Base SKU: IPv4: 24K, IPv6: 12K |
| Dynamic Host Configuration Protocol (DHCP) Snooping Entries | 12K (DHCP snooping bindings) |
| ARP Entries | 47K |
| Spanning Tree Protocol Instances | 10K |
| Jumbo Frame Support for Bridged and Routed Packets | Up to 9216 bytes |
| High Availability Solution | Virtual Switching System (VSS) |
| Number of stackable switches in VSS | Up to 2 |
| VSS Throughput | Up to 1.6 Tbps |
| Virtual Switch Link | 1GE or 10GE |
| Max number of Virtual Switch Links | 8 |
| In-Service Software Upgrade | Across the switches |
| Nonstop Forwarding with Stateful Switchover | Across the switches |
| Onboard Memory (SRAM DDR-II) | 4 GB |
| Port Buffers | 32-MB Shared Memory |
| CPU | Dual Core 1.5 GHz |
| NVRAM | 2 GB |
| Optional External Memory (SD Card) | 2 GB |
| Port Queues | 8 Queues/Port |
| CPU Queues | 64 |
| QoS Entries | 128K (64K ingress and 64K in egress) Shared with ACL |
| Aggregate Rate-Limiting | Ingress port or VLAN and egress VLAN or Layer 3 port |
| Rate-Limiting Level Types | Committed Information Rate (CIR), Peak Information Rate (PIR) |
| Aggregate Traffic Rate-Limiting Policers (1K=1024) | 16K |
| Flow-Based Rate-Limiting Method; Number of Rates | Supported using flow-records in the classification criteria and policing action |
| Qos Policy Enforcement | Per Port or Per Vlan or Per Port, Per VLAN Granularity |
| Class of Service (CoS) | Yes |
| Differentiated Services Code Point (DSCP) | Yes |
| Port Security | Yes |
| IEEE 802.1x and 802.1x Extensions | Yes |
| VLAN, Router, and Port ACLs | Yes |
| Security ACL Entries (1K=1024) | 128K (64K ingress and 64K in egress) Shared with QoS |
| Unicast Reverse Path Forwarding (uRPF) Check in Hardware | Yes |
| CPU Rate Limiters (DoS Protection) Includes Control Plane Policing | Yes |
| Private VLANs | Yes |
| Micro Flow Policer | Yes. Supported using flow records in the class-map |
| CPU HW Rate Limiters by Packet Per Second (pps) and Bit Rate Policers (bps) | Supported in hardware control-plane policing (CoPP) |
| Control Plane Policing (CoPP) for Multicast | Yes |
| ACL Labels | Yes |
