Cisco Catalyst C4948E-F-E, Refurbished M

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The Cisco Catalyst® 4948E and 4948E-F Ethernet Switches are the Cisco Catalyst 4900 Series data center switches built from the start to deliver best-in-class, full-featured server-access switching. The switches include identical features except that the Cisco Catalyst 4948E offers front-to-back cooling, and the Cisco Catalyst 4948E-F offers back-to-front cooling. 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 and 4948E-F 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 and 4948E-F double the uplink bandwidth and offer true front-to-back and back-to-front airflow with no side or top venting. The airflow direction is controlled by the changing of fans. Optional front-to-back and back-to-front airflow management reduces data center operating costs by providing strict hot-aisle and cold-aisle isolation.

Hot-aisle and cold-aisle deployment remains the widely adopted best practice for data center cabinet layouts today. Networking switches and computing servers mounted in a single cabinet need to maintain the separation of the inlet cold air and the exhaust hot air for efficient use of cooling resources. The Cisco Catalyst 4948E and 4948E-F switches provide the option of front-to-back airflow (Cisco Catalyst 4948E) and back-to-front airflow (Cisco Catalyst 4948E-F) for ToR switch deployments.

Exceptional reliability and serviceability are delivered with optional internal AC and DC 1+1 hot-swappable power supplies and a hot-swappable fan tray with redundant fans

Scalability and Performance

– 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

Enhanced Manageability

– Pay as you grow with software feature packages, from Layer 2 only (LAN Base) to full Layer 3 capability (Enterprise Services)
– Reduced operating expenses (OpEx) with tools such as AutoInstall and Cisco IOS® Embedded Event Manager (EEM) that enable immediate availability
– Data center automation with IP service-level agreement (SLA) and Smart Call Home
– Data center optimization with true front-to-back and back-to-front airflow, including power suply cooling
– Enhanced application visibility with smart flow logging
– Enhanced manageability through eight bidirectional Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) sessions
– Network visibility through Cisco® NetFlow-Lite (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
– Active queue management using dynamic buffer limiting (DBL) for increased security and network control

Cisco IOS Software

Cisco IOS Software is a proven network OS that offers best-in-class availability, manageability, and scalability.

The Cisco Catalyst 4948E and 4948E-F support 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.

Feature Feature Value
Switch type Managed
Switch layer L2/L3
Quality of Service (QoS) support Y
Web-based management Y
Traffic shaping Y
ARP inspection Y
MIB support Y
Basic switching RJ-45 Ethernet ports quantity 48
Basic switching RJ-45 Ethernet ports type Gigabit Ethernet (10/100/1000)
SFP+ module slots quantity 4
Fiber optic connector SFP+
Console port RJ-12
Networking standards IEEE 802.1D,IEEE 802.1Q,IEEE 802.1p,IEEE 802.1x,IEEE 802.3,IEEE 802.3ab,IEEE 802.3u,IEEE 802.5
10G support Y
Copper ethernet cabling technology 10BASE-T,100BASE-TX,1000BASE-T
Spanning tree protocol Y
VLAN support Y
Number of VLANs 4096
MAC address table 55000 entries
Switching capacity 176 Gbit/s
Number of queues 8
Packet buffer memory 17.5 MB
Access Control List (ACL) Y
IGMP snooping Y
MAC address filtering Y
Multicast support Y
Number of multicast groups filtered 28000
Rack mounting Y
Product colour Grey
Form factor 1U
Safety UL 60950-1, CAN/CSA-C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950, IEC 60825-1, IEC 60825-2, EN 60825-1, EN 60825-2, 21 CFR 1040
Electromagnetic compatibility FCC, ICES-003, EN55022, CISPR22, AS/NZS 3548, VCCI, EN55024, ETS300 386, EN50082-1, EN61000-3-2, EN61000-3-3
Built-in processor Y
Processor frequency 1000 MHz
Internal memory 1024 MB
Mean time between failures (MTBF) 145422 h
Power supply included Y
AC input voltage 90 – 264 V
AC input frequency 50 – 60 Hz
Power consumption (typical) 230 W
Power consumption (max) 275 W
Power over Ethernet (PoE) N
Operating temperature (T-T) 0 – 40 °C
Storage temperature (T-T) -40 – 75 °C
Operating relative humidity (H-H) 10 – 90%
Operating altitude -60 – 2000 m
Heat dissipation 1173 BTU/h
Width 444 mm
Depth 493 mm
Height 44 mm
Weight 8.62 kg



Additional information

Switch type


Number of queues



493 mm

Heat dissipation

1173 BTU/h

Operating temperature (T-T)

0 – 40 °C

Power consumption (max)

275 W

AC input frequency

50 – 60 Hz

Power supply included


Internal memory

1024 MB

Built-in processor



UL 60950-1, CAN/CSA-C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950, IEC 60825-1, IEC 60825-2, EN 60825-1, EN 60825-2, 21 CFR 1040

Product colour


MAC address filtering


Access Control List (ACL)



8.62 kg

Fiber optic connector


VLAN support


Traffic shaping


Networking standards

IEEE 802.1D,IEEE 802.1Q,IEEE 802.1p,IEEE 802.1x,IEEE 802.3,IEEE 802.3ab,IEEE 802.3u,IEEE 802.5

MIB support


MAC address table

55000 entries

SFP module slots quantity



44 mm

Web-based management



444 mm

Operating altitude

-60 – 2000 m

Storage temperature (T-T)

-40 – 75 °C

ARP inspection


Power over Ethernet (PoE)


Power consumption (typical)

230 W

Switching capacity

176 Gbit/s

AC input voltage

90-264 V

Console port


Processor frequency

1000 MHz

10G support


Form factor


Spanning tree protocol


Rack mounting


Switch layer


IGMP snooping


Number of VLANs


Packet buffer memory

17.5 MB

Multicast support



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