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Cisco Catalyst 4900 Series Switches

New Cisco Catalyst 4948E-F Ethernet Switch for High-Performance Data Center Access

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Cisco is extending the widely deployed Cisco Catalyst® 4948E Ethernet Switch to offer back-to-front airflow with the Cisco Catalyst 4948E-F Switch. In addition to back-to-front airflow, the Cisco Catalyst 4948E-F offers forty-eight 10/100/1000-Gbps RJ45 downlink ports and four fiber uplink ports capable of Gigabit Ethernet and 10 Gigabit Ethernet. This switch is designed to simplify data center architecture and operations by offering enterprise-class hardware and software in a one-rack-unit (1RU) form factor optimized for smart top-of-rack (ToR) data center deployments (Figure 1).

Figure 1. Cisco Catalyst 4948E-F

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) in ToR switch deployments. Table 1 summarizes the deployment scenarios for the Cisco Catalyst 4948E and 4948E-F to help you decide which switch to use.

Table 1. Deployment Decision Factors and Switch Selection

Switch Choice

Decision Factors

Cisco Catalyst 4948E

• Server-to-switch cable patch panel facing the cold aisle
• Network ports face the cold aisle
• Upgrading from traditional front-connected ToR switches

Cisco Catalyst 4948E-F

• Cable patch panel facing the hot aisle
• Network ports face the hot aisle
• Server-to-switch connectivity is without the patch panel

Figures 2 and 3 show data center server-to-switch connectivity scenarios for the Cisco Catalyst 4948E and 4948E-F.

Figure 2. Cold-Aisle and Hot-Aisle Isolation Using Back-to-Front Airflow with Cisco Catalyst 4948E-F

Figure 3. Cold-Aisle and Hot-Aisle Isolation Using Front-to-Back Airflow with Cisco Catalyst 4948E

New Features

The Cisco Catalyst 4948E-F offers:

• Hardware and software feature parity with the Cisco Catalyst 4948E

• True back-to-front airflow

Table 2 summarizes the main features of the Cisco Catalyst 4900 Series Switches.

Table 2. Cisco Catalyst 4900 Series Features

Feature and Description

Cisco Catalyst 4948 Switch

Cisco Catalyst 4948 10 Gigabit Ethernet Switch

Cisco Catalyst 4900M Switch

Cisco Catalyst 4948E and 4948E-F Switches

Environmental

Height

1RU

1RU

2RU

1RU

Dimensions (H x W x D)

1.71 x 17.3 x 16.1 in. (4.3 x 43.9 x 40.9 cm)

1.71 x 17.3 x 16.1 in. (4.3 x 43.9 x 40.9 cm)

3.5 x 17.2 x 17.9 in. (8.9 x 43.7 x 45.5 cm)

1.75 x 17.5 x 19.4 in. (4.4 x 44.4 x 49.3 cm)

Power redundancy

1+1 AC or DC

1+1 AC or DC

1+1 AC or DC

1+1 AC or DC

Unit weight

16.5 lb (7.48 kg)

16.5 lb (7.48 kg)

34.0 lb (15.4 kg)

19 lb (8.62 kg)

Hot-swappable fan

Yes

Yes

Yes

Yes

Average and maximum power consumption (in watts [W])

176W average

300W maximum

212W average

300W maximum

300W average

446W maximum

230W average

275W maximum

Airflow

Side to back

Side to back

Side to back

Front to back (Cisco Catalyst 4948E)

Back to front (Cisco Catalyst 4948E-F)

Rack-mounting options

Front and rear mount

Front and rear mount

High-performance rear mount

Four-post rack-side rail mount

High-performance mount

Front and rear mount

High-performance rear mount

Uplink optic types

Four Small Form-Factor Pluggable (SFP) optics

Two X2 (10 Gigabit Ethernet) optics

Eight X2 (10 Gigabit Ethernet) optics

SFP and SFP+

Cisco® TwinGig Converter Module support

No

No

Yes (WS-X4908-10GE only)

No

Cisco OneX Converter Module support (X2 to SFP+)

No

No

Yes

No

Optics

LH, SX, ZX, and CWDM

LR, CX4, LX4, SR, ER, LRM, ZR, and DWDM

X2: LR, CX4, LX4, SR, ER, LRM, ZR, and DWDM

SFP+: SR

CWDM, DWDM, SR, LR, LRM, and CX4

Modular half-card slots

0

0

2

0

Ports

Maximum 10/100/1000-Gbps ports

48

48

40

48

Maximum Gigabit Ethernet (fiber) ports

4

0

32 (Cisco TwinGig Converter Module)

4

Maximum 10 Gigabit Ethernet (10GBASE-T) ports

0

0

16

0

Maximum 10 Gigabit Ethernet (fiber) ports

0

2 (X2)

24 (X2)*

4 (SFP+)

Performance and Scalability

Switching capacity

96 Gbps

136 Gbps

320 Gbps

176 Gbps

Throughput

72 million packets per second (mpps)

102 mpps

250 mpps for IPv4

125 mpps for IPv6

131 mpps for IPv4

110 mpps for IPv6

Routes supported

32,000

32,000

256,000

57,000

MAC addresses

32,000

55,000

55,000

55,000

Per-VLAN Spanning Tree (PVST) Protocol and VLAN IDs

4094

4094

4094

4094

Spanning Tree Protocol instances

4094

4094

4094

4094

Switched virtual interfaces (SVIs)

2000

2000

4094

4094

Active VLANs

4094

4094

4094

4094

Multicast routes

28,000

28,000

28,000

28,000

Security and quality-of-service (QoS) hardware entries

32,000

32,000

128,000

32,000

Switched Port Analyzer (SPAN)

2 ingress and 4 egress

2 ingress and 4 egress

8 ingress and 8 egress

8 ingress and 8 egress

Shared buffer

16 MB

16 MB

17.5 MB

17.5 MB

CPU

266 MHz

666 MHz

1.3 GHz

1 GHz

Synchronous dynamic RAM (SDRAM)

256 MB

256 MB

512 MB

1 GB

Multilayer switching

LAN Base, IP Base, and Enterprise Services options

LAN Base, IP Base, and Enterprise Services options

LAN Base, IP Base, and Enterprise Services options

LAN Base, IP Base, and Enterprise Services options

IPv6 support

Software switched

Software switched

Hardware switched

Hardware switched

USB port

No

No

Yes

No

Compact flash memory support

No

No

Yes

No

System reset button

No

No

Yes

Yes

Minimum software requirements

Cisco IOS® Software Release 12.2(20)EWA or later

Cisco IOS Software Release 12.2(25)EWA or later

Cisco IOS Software Release 12.2(46)SG or later

Cisco IOS Software Release 12.2(54)SG or later (Cisco Catalyst 4948E)

Cisco IOS Software Release 12.2(54)WO or later (Cisco Catalyst 4948E-F)

* X2 can be converted to SFP+ using the Cisco OneX Converter Module.

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 Embedded Event Manager (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. For a detailed list of supported software features, please refer to the software release notes at http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/release/note/OL_23985.html.

Ordering Information

Table 3 provides ordering information for the Cisco Catalyst 4948E and 4948E-F switches.

Table 3. Ordering Information

Description

Part Number

Hardware

 

Front to Back Cooling

Back to Front Cooling

48x 10/100/1000(RJ45)+4x 10GbE(SFP+), no p/s

WS-C4948E

WS-C4948E-F

48x 10/100/1000(RJ45)+4x10GbE(SFP+), IP Base IOS, AC p/s

WS-C4948E-S

WS-C4948E-F-S

48x 10/100/1000(RJ45)+4x10GbE(SFP+), Ent Ser IOS, AC p/s

WS-C4948E-E

WS-C4948E-F-E

Green Bundle 10x WS-C4948E

WS-C4948E-BDL

WS-C4948E-F-BDL

Catalyst 4948E 300WAC power supply (spare)

PWR-C49E-300AC-R(=)

PWR-C49E-300AC-F(=)

Catalyst 4948E 300WAC redundant power supply

PWR-C49E-300AC-R/2

PWR-C49E-300AC-F/2

Catalyst 4948E 300WDC power supply (spare)

PWR-C49-300DC(=)

Not Available at this time

Catalyst 4948E 300WDC redundant power supply (spare)

PWR-C49-300DC/2

Not Available at this time

Software

Cisco IOS Software for Cisco Catalyst 4948E Series Switches (LAN Base image)

S49ELB-12254SG(=)

S49ELB-12254WO(=)

Cisco IOS Software for Cisco Catalyst 4948E Series Switches (LAN Base image with Triple Data Encryption)

S49ELBK9-12254SG(=)

S49ELBK9-12254WO(=)

Cisco IOS Software for Cisco Catalyst 4948E Series Switches (IP Base image)

S49EIPB-12254SG(=)

S49EIPB-12254WO (=)

Cisco IOS Software for Cisco Catalyst 4948E Series Switches (IP Base image with Triple Data Encryption)

S49EIPBK9-12254SG(=)

S49EIPBK9-12254WO (=)

Cisco IOS Software for Cisco Catalyst 4948E Series Switches (Enterprise Services image with BGP support)

S49EES-12254SG(=)

S49EES-12254WO(=)

Cisco IOS Software for Cisco Catalyst 4948E Series Switches (Enterprise Services image with 3DES and BGP support)

S49EESK9-12254SG(=)

S49EESK9-12254WO(=)

Catalyst 4948 IP Base Upgrade License for LAN Base IOS

WS-C4900-SW-LIC

WS-C4900-SW-LIC

Accessories

Cisco Catalyst 4948E spare fan tray rear exhaust

WS-X4993(=)

WS-X4993-F(=)

Power Cables

AC Power cord, 110V North America, Japan

CAB-US515-C15-US(=)

AC Power cord, 220V North America

CAB-N5K6A-NA(=)

AC Power cord (Australia, New Zealand)

CAB-AS3112-C15-AU(=)

AC Power cord (Europe)

CAB-CEE77-C15-EU(=)

AC Power cord CD12 (Italy)

CAB-C2316-C15-IT(=)

AC Power cord (Argentina)

CAB-IR2073-C15-AR(=)

AC Power cord (South Africa, India)

CAB-SABS-C15-IND(=)

AC Power cord (United Kingdom)

CAB-BS1363-C15-UK(=)

AC Power cord (Switzerland)

CAB-9K10A-SW(=)

Cisco Services

Cisco Services makes networks, applications, and the people who use them work better together.
Today, the network is a strategic platform in a world that demands better integration of people, information, and ideas. The network works better when services, together with products, create solutions aligned with business needs and opportunities.
The unique Cisco Lifecycle approach to services defines the requisite activities at each phase of the network lifecycle to help ensure service excellence. With a collaborative delivery methodology that joins the forces of Cisco, our skilled network of partners, and our customers, we achieve the best results.

For More Information

For more information about the Cisco Catalyst 4948E and 4948E-F, visit http://www.cisco.com/go/4900.