• Expansion Module (Optional)
• 8×10 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
• 32×10 GE Port Base SKU: IPv4: 256K, IPv6: 128K
• 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
• 32×10 GE Port Base SKU: IPv4: 32K, IPv6: 32K
• 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

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