The Cisco Catalyst 3750-X Series introduces Cisco StackPower technology, innovative power interconnect system that allows the power supplies in a stack to be shared as a common resource among all the switches. Cisco StackPower unifies the individual power supplies installed in the switches and creates a pool of power, directing that power where it is needed. This feature is available in all Cisco Catalyst 3750-X Series Switches feature sets. Up to four switches can be configured in a StackPower stack with the special connector at the back of the switch using the StackPower cable, which is different than the StackWise cables. StackPower can be deployed in either power sharing mode or redundancy mode. In power sharing mode, the power of all the power supplies in the stack is aggregated and distributed among the switches in the stack. In redundant mode, when the total power budget of the stack is calculated, the wattage of the largest power supply is not included. That power is held in reserve and used to maintain power to switches and attached devices when one power supply fails, enabling the network to operate without interruption. Following the failure of one power supply, the StackPower mode becomes power sharing. StackPower allows customers to simply add one extra power supply in any switch of the stack and provide either power redundancy for any of the stack members or simply add more power to the shared pool. StackPower eliminates the need for an external redundant power system or installation of dual power supplies in all the stack members.

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Switch
Security	Cisco Advanced Security Features; Port security, DHCP snooping, Dynamic ARP inspection, IP source guard, RADIUS change of authorization, IGMP filtering, Cisco security VLAN ACLs, Port-based ACLs for Layer 2 interfaces, etc
VLAN	Up to 255 VLANs and 4000 VLAN ID
Manageable	Yes
Layer 2 switching	Yes, IEEE 802.1s/w Rapid Spanning Tree Protocol (RSTP) and Multiple Spanning Tree Protocol (MSTP), Per-VLAN Rapid Spanning Tree (PVRST+), Switch-port autorecovery (Errdisable)
Layer 3 Switching	Optional with IP Based and IP Service upgrade
Number of Port	24x 10/100/1000 PoE Ports + Optional Network Module for Uplink
Stackable	Yes, up to 9 switch using Cisco StackWise Plus
Redundant Power Supply	Optional dual redundant, modular power supplies
Rackmount	Yes
Warranty	Cisco Enhanced Limited Lifetime Hardware Warranty

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