Cisco Catalyst WS-C4948E-E Switch 48x 10/100/1000(RJ45)+4x 10GbE(SFP+) 1xPWR

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 The Cisco Catalyst 4948E build on the advanced technology of the Cisco Catalyst 4948 Switches, the most widely deployed ToR switch in the industry, with more than 10 million ports deployed worldwide. The Cisco Catalyst 4948E double the uplink bandwidth and offer true front-to-back airflow with no side or top venting. The airflow direction is controlled by the changing of fans. Optional front-to-back airflow management reduces data center operating costs by providing strict hot-aisle and cold-aisle isolation. Each switch offers forty-eight 10/100/1000-Gbps RJ45 downlink ports and four 1 and 10 Gigabit Ethernet uplink ports. The switches are designed to simplify data center architecture and operations by offering service provider-grade hardware and software in a one-rack-unit (1RU) form factor optimized for full-featured top-of-rack (ToR) data center deployments.The Cisco Catalyst 4948E supports three levels of Cisco IOS Software. The basic level is LAN Base, developed for deployments that require data center-class hardware along with Layer 2 switching but not advanced features such as routing and Cisco IOS EEM. The next level of software is IP Base; this level supports static routes, Routing Information Protocol (RIP) Versions and 2, and Enhanced Interior Gateway Routing Protocol Stub (EIGRP-Stub) for limited routing. The top level of software is Enterprise Services; this level adds support for advanced routing protocols such as Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), Intermediate System-to-Intermediate System (IS-IS) Protocol, and EIGRP

 - Nonblocking server-to-server traffic with 176-Gbps aggregate throughput

 - Ease of migration from Gigabit Ethernet to 10 Gigabit Ethernet upstream with support for SFP and SFP+ optics

 - Large buffers optimized to handle microbursts with 17.5 MB of centralized buffering, helping ensure that business-critical packets are not lost due     to insufficient buffering

 - Active queue management through dynamic buffer limiting for TCP throughput optimizations

 - Investment protection through data center design with dual-stack IP Versions 4 and 6 (IPv4 and v6) support

 - Advanced quality of service (QoS) with eight configurable queues for each port

 - Data center server virtualization support for larger Layer 2 domains with scalable MAC addresses

 - Support for a wide variety of optics connecting to the aggregation layer

 - Front-to-back and back-to-front airflow options

 - Optimized forwarding across all four uplinks with equal-cost multipath (ECMP) load sharing

 - Active queue management using dynamic buffer limiting (DBL) for increased security and network control

 - Server-rack-optimized switches with the option of front-to-back or back-to-front airflow

 - Nonblocking hardware-based switching and routing

 - Full support for access- and distribution-level Layer 3 routing

 - Advanced QoS including a modular QoS command-line interface (CLI)

 - Advanced security

 - Extended MAC address support for virtual environments

 - Network visibility (future support)

 - 1+1 AC or DC power supplies and hot-swappable fan tray with redundant fans for high availability for mission-critical applications

 - Optimized forwarding across all four uplinks with equal-cost multipath (ECMP) load sharing

 - Improved resiliency with protection from attacks with access control lists (ACLs), Control Plane Policing (CoPP), Address Resolution Protocol (ARP)        inspection, and Dynamic Host Configuration Protocol (DHCP) snooping