Cisco Catalyst 4948 Managed L3 Switch - 48 Ethernet Ports & 4 SFP Ports (WS-C4948-E) - RECERTIFIED
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Cisco Catalyst 4948 Managed L3 Switch - 48 Ethernet Ports & 4 SFP Ports (WS-C4948-E) - RECERTIFIED

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High-Performance, Rack-Optimized Server Switching

Product Overview

The Cisco Catalyst® 4948 Switch is a wire-speed, low-latency, Layer 2 to 4, 1-rack-unit (1RU), fixed-configuration switch for rack-optimized server switching. Based on the proven Cisco® Catalyst 4500 Series hardware and software architecture, the Cisco Catalyst 4948 offers exceptional performance and reliability for low-density, multilayer aggregation of high-performance servers and workstations. High performance and scalability of intelligent network services is made possible with dedicated specialized resources known as ternary content addressable memory (TCAM). Ample TCAM resources (64,000 entries) enable high feature capacity, providing wire-speed routing and switching performance with concurrent provisioning of services such as quality of service (QoS) and security, and helping ensure scalability for today's network requirements with ample room for future growth.

The Cisco Catalyst 4948 offers 48 ports of wire-speed 10/100/1000BASE-T with four alternative wired ports that can accommodate optional 1000BASE-X Small Form-Factor Pluggable (SFP) optics.[1] Exceptional reliability and serviceability are delivered with optional internal AC or DC 1+1 hot-swappable power supplies and a hot-swappable fan tray with redundant fans.

Features and Benefits

  • Wire-Speed Performance for 10/100/1000 Connectivity

The Cisco Catalyst 4948 delivers wire-speed throughput with low latency for data-intensive applications, using a 96-Gbps switching fabric with a forwarding rate of 72 million packets per second (mpps) in hardware for Layer 2 to 4 traffic. Switching performance remains high regardless of the number of route entries or Layer 3 and 4 services enabled. Hardware-based Cisco Express Forwarding routing architecture enables increased scalability and performance.

  • Power Supply Redundancy for Nonstop Operation

The Cisco Catalyst 4948 provides reliability for critical applications, with 1+1 redundant hot-swappable internal AC or DC power supplies. The 1+1 power supply design provides A-to-B failover when power supplies are connected to different circuits. AC and DC power supplies can be mixed in the same unit for outstanding deployment flexibility. The Cisco Catalyst 4948 also has a hot-swappable fan tray with four redundant fans for additional serviceability and availability.

  • Wire-Speed Performance for 10/100/1000 Connectivity

The Cisco Catalyst 4948 delivers wire-speed throughput with low latency for data-intensive applications, using a 96-Gbps switching fabric with a forwarding rate of 72 million packets per second (mpps) in hardware for Layer 2 to 4 traffic. Switching performance remains high regardless of the number of route entries or Layer 3 and 4 services enabled. Hardware-based Cisco Express Forwarding routing architecture enables increased scalability and performance.

  • Power Supply Redundancy for Nonstop Operation

The Cisco Catalyst 4948 provides reliability for critical applications, with 1+1 redundant hot-swappable internal AC or DC power supplies. The 1+1 power supply design provides A-to-B failover when power supplies are connected to different circuits. AC and DC power supplies can be mixed in the same unit for outstanding deployment flexibility. The Cisco Catalyst 4948 also has a hot-swappable fan tray with four redundant fans for additional serviceability and availability.

Comprehensive Management

The Cisco Catalyst 4948 includes a single, dedicated 10/100 console port and a single, dedicated 10/100 management port for offline disaster recovery. Remote in-band management is available with the Simple Network Management Protocol (SNMP), Telnet client, Bootstrap Protocol (BOOTP), and Trivial File Transfer Protocol (TFTP). Support for local or remote out-of-band management is delivered through a terminal or modem attached to the console interface. The management port helps enable the Cisco Catalyst 4948 to reload a new image from a TFTP server within seconds.

The Cisco Catalyst 4948 delivers a comprehensive set of management tools to provide the visibility and control required for server switching. Managed with CiscoWorks solutions and embedded CiscoWorks CiscoView, the Cisco Catalyst 4948 can be configured and managed to deliver device, VLAN, traffic, and policy management. These web-based management tools offer numerous services, including software deployment and quick isolation of error conditions.

Software: 

Enterprise Services image

Enhanced Layer 3 image, including Open Shortest Path First (OSPF), Intermediate System–to–Intermediate System (IS-IS), EIGRP, Border Gateway Protocol (BGP), AppleTalk, and Internetwork Packet Exchange (IPX) software routing; also includes all IP Base image features

Table 1 compares the features of the Cisco Catalyst 4948 Switch, Catalyst 4948 10 Gigabit Ethernet Switch, and Catalyst 4900M Switch.Feature Comparison

Table 1.       Cisco Catalyst 4900 Series Switches Model Comparison

Feature and Description

Cisco Catalyst 4948

Cisco Catalyst 4948 10 Gigabit Ethernet

Cisco Catalyst 4900M

Switching capacity

96 Gbps

136 Gbps

320 Gbps

Throughput

72 mpps

102 mpps

ΓùÅ  250 mpps for IPv4
ΓùÅ  125 mpps for IPv6

IPv6 support

In software

In software

In hardware

Height

1RU

1RU

2RU

Modular half-card slots

0

0

2

Maximum 10/100/1000 ports

48

48

40

Maximum 10 Gigabit Ethernet ports

0

2

24

Maximum Gigabit Ethernet (fiber) ports

4

0

32 (Cisco TwinGig Converter Module)

Cisco TwinGig Converter Module support

No

No

Yes (half-cards only)

Uplink optic type

4 SFP optics

2 X2 (10 Gigabit Ethernet) optics

8 X2 (10 Gigabit Ethernet) optics

Multilayer switching

IP Base and Enterprise Services options

IP Base and Enterprise Services options

IP Base and Enterprise Services options

Shared buffer

16 MB

16 MB

16 MB

CPU

266 MHz

666 MHz

1.3 GHz

Synchronous Dynamic RAM (SDRAM)

256 MB

256 MB

512 MB

Active VLANs

4096

4096

4096

Multicast entries

ΓùÅ  28,000 (Layer 3)
ΓùÅ  16,000 (Layer 2)
ΓùÅ  28,000 (Layer 3)
ΓùÅ  16,000 (Layer 2)
ΓùÅ  56,000 for IPv4
ΓùÅ  28,000 for IPv6

Per-VLAN Spanning Tree (PVST) and VLAN IDs

4096

4096

4096

Spanning Tree Protocol instances

1500

1500

3000

Switched Virtual Interfaces (SVIs)

2000

2000

4000

Security and QoS hardware entries

32,000

32,000

128,000

MAC addresses

32,000

55,000

55,000

Switched Port Analyzer (SPAN)

2 ingress and 4 egress

2 ingress and 4 egress

8 ingress and 8 egress

USB port

No

No

Yes

Compact flash memory support

No

No

Yes

System reset button

No

No

Yes

Minimum software requirement

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(40)XO or later

Features and Specifications at a Glance

Performance and Switching

ΓùÅ   96 Gbps nonblocking switch fabric

ΓùÅ   72 mpps Layer 2 forwarding (hardware)

ΓùÅ   72 mpps Layer 3 and 4 forwarding: IP routing and Cisco Express Forwarding (hardware)

ΓùÅ   Layer 2 to 4 hardware-based switch engine (application-specific integrated circuit [ASIC]-based)

ΓùÅ   Unicast and multicast routing entries: 32,000

ΓùÅ   Support for 4096 active VLANs and 4096 VLAN IDs per switch

ΓùÅ   Layer 2 multicast addresses: 16,384

ΓùÅ   MAC addresses: 32,768

ΓùÅ   Policers: 512 ingress and 512 egress

ΓùÅ   Access control list (ACL) and QoS entries: 32,000

ΓùÅ   Uplinks: 4 alternatively wired SFP ports with Cisco Gigabit EtherChannel support

ΓùÅ   Latency: 6 microseconds for 64-byte packets

ΓùÅ   SVIs: 2048

ΓùÅ   Spanning Tree Protocol instances: 1500

ΓùÅ   Internet Group Management Protocol (IGMP) snooping entries: 16,000

Layer 2 Features

ΓùÅ   Layer 2 hardware forwarding at 72 mpps

ΓùÅ   Layer 2 switch ports and VLAN trunks

ΓùÅ   IEEE 802.1Q VLAN encapsulation

ΓùÅ   Inter-Switch Link (ISL) VLAN encapsulation

ΓùÅ   Dynamic Trunking Protocol (DTP)

ΓùÅ   VLAN Trunking Protocol (VTP) and VTP domains

ΓùÅ   PVST+ and Per-VLAN Rapid Spanning Tree Protocol (PVRST)

ΓùÅ   Flexlink

ΓùÅ   Spanning Tree PortFast and PortFast Guard

ΓùÅ   Spanning Tree UplinkFast and BackboneFast

ΓùÅ   IEEE 802.1s

ΓùÅ   IEEE 802.1w

ΓùÅ   IEEE 802.3ad

ΓùÅ   Spanning Tree Root Guard

ΓùÅ   Cisco Discovery Protocol Version 1 and 2

ΓùÅ   IGMPv1, v2, and v3

ΓùÅ   Cisco EtherChannel technology, Cisco Fast EtherChannel technology, and Cisco Gigabit EtherChannel technology support

ΓùÅ   Port Aggregation Protocol (PAgP)

ΓùÅ   Link Aggregation Control Protocol (LACP)

ΓùÅ   Unidirectional Link Detection Protocol (UDLD) and aggressive UDLD on the SFP ports

ΓùÅ   IEEE 802.1 Q-in-Q in hardware

ΓùÅ   Layer 2 protocol tunneling

ΓùÅ   Jumbo frames on all ports (up to 9216 bytes)

ΓùÅ   Baby giants (up to 1600 bytes)

ΓùÅ   Unidirectional Ethernet

ΓùÅ   Hardware-based storm control (formerly known as broadcast and multicast suppression)

ΓùÅ   Community private VLANs (PVLANs)

ΓùÅ   Forced 10/100 autonegotiation

ΓùÅ   Web Cache Communication Protocol (WCCP) Version 2 Layer 2 redirect

ΓùÅ   Private VLAN promiscuous trunk

ΓùÅ   Layer 2 promiscuous trunk over trunk port (L2PT)

ΓùÅ   Class-of-service (CoS) mutation

ΓùÅ   E-OAM 802.3ah and CFM: 802.1ag

Layer 3 Features

ΓùÅ   Jumbo frames on all ports (up to 9216 bytes)

ΓùÅ   Hardware-based IP Cisco Express Forwarding routing at 72 mpps

ΓùÅ   Static IP routing

ΓùÅ   IP routing protocols: EIGRP, OSPF, RIP, and RIPv2

ΓùÅ   BGPv4 and Multicast Border Gateway Protocol (MBGP)

ΓùÅ   Nonstop Forwarding (NSF) awareness

ΓùÅ   Hot Standby Router Protocol (HSRP) v1 and v2

ΓùÅ   Software routing of IPX and AppleTalk

ΓùÅ   IS-IS routing protocol

ΓùÅ   IGMPv1, v2, and v3

ΓùÅ   IGMP filtering on access and trunk ports

ΓùÅ   IP multicast routing protocols: Protocol Independent Multicast (PIM), Source-Specific Multicast (SSM), and Distance Vector Multicast Routing Protocol (DVMRP)

ΓùÅ   Auto rendezvous point (Auto-RP)

ΓùÅ   Distance Vector Multicast Routing Protocol (DVMRP)

ΓùÅ   Pragmatic General Multicast (PGM)

ΓùÅ   Cisco Group Management Protocol (GMP) server

ΓùÅ   Full Internet Control Message Protocol (ICMP) support

ΓùÅ   ICMP Router Discovery Protocol

ΓùÅ   Policy-based routing (PBR)

ΓùÅ   Virtual Route Forwarding lite (VRF-lite)

ΓùÅ   VRF-aware IP services

ΓùÅ   IPv6 software switching support

ΓùÅ   OSPF fast convergence

ΓùÅ   OSPF and EIGRP fast-convergence protection

ΓùÅ   EIGRP stub

ΓùÅ   Virtual Router Redundancy Protocol (VRRP)

ΓùÅ   IP unnumbered for SVI

ΓùÅ   Nonstop Forwarding (NSF) awareness

ΓùÅ   WCCPv2

ΓùÅ   Gateway Load Balancing Protocol (GLBP)

High-Availability Features

ΓùÅ   1+1 hot-swappable AC or DC power supplies

ΓùÅ   Hot-swappable field-replaceable fan tray with redundant fans

ΓùÅ   HSRP v1 and v2

ΓùÅ   VRRP

ΓùÅ   Cisco IOS Embedded Event Manager (EEM)

ΓùÅ   Cisco Generic Online Diagnostics (GOLD)

ΓùÅ   Smart Call Home

Sophisticated QoS and Traffic Management

ΓùÅ   Per-port QoS configuration

ΓùÅ   Per-port and per-VLAN QoS

ΓùÅ   Support for four queues per port in hardware

ΓùÅ   Strict priority queuing

ΓùÅ   IP differentiated services code point (DSCP) and IP precedence

ΓùÅ   Classification and marking based on IP type of service (ToS) or DSCP

ΓùÅ   Classification and marking based on full Layer 3 and 4 headers (IP only)

ΓùÅ   Input and output policing based on Layer 3 and 4 headers (IP only)

ΓùÅ   Support for 512 policers on ingress and 512 policers on egress configured as aggregate or individual

ΓùÅ   Shaping and sharing output queue management

ΓùÅ   Dynamic Buffer Limiting (DBL) advanced congestion-avoidance feature

ΓùÅ   No performance penalty for granular QoS functions

ΓùÅ   Matched CoS for non-IPv4 traffic

Predictable Performance

ΓùÅ   96-Gbps switching fabric

ΓùÅ   Layer 2 hardware forwarding at 72 mpps

ΓùÅ   Layer 3 hardware-based IP Cisco Express Forwarding routing at 72 mpps

ΓùÅ   Layer 4 TCP and User Datagram Protocol (UDP) hardware-based filtering at 72 mpps

ΓùÅ   No performance penalty with advanced Layer 3 and 4 services enabled

ΓùÅ   Software-based learning at a sustained rate of 500 hosts per second

ΓùÅ   Support for 32,768 MAC addresses

ΓùÅ   Support for 32,000 entries in routing table (shared between unicast and multicast)

ΓùÅ   Support for 512 ingress policers and 512 egress policers

ΓùÅ   Support for 32,000 ACL and QoS entries

ΓùÅ   Scalability to 2048 virtual ports (VLAN port instances)

ΓùÅ   Scalability to 8000 IGMP snooping entries

ΓùÅ   Scalability to 1500 Spanning Tree Protocol instances

ΓùÅ   Bandwidth aggregation up to 16 Gbps through Cisco Gigabit EtherChannel technology

ΓùÅ   Hardware-based wire-speed multicast management

ΓùÅ   Hardware-based wire-speed ACLs

Comprehensive Management

ΓùÅ   Manageable through CiscoWorks Windows network-management software on a per-port and per-switch basis, providing a common management interface for Cisco routers, switches, and hubs

ΓùÅ   Manageable through Cisco Network Assistant

ΓùÅ   SNMPv1, v2, and v3 instrumentation, delivering comprehensive in-band management

ΓùÅ   Command-line interface (CLI)-based management console to provide detailed out-of-band management

ΓùÅ   Remote Monitoring (RMON) software agent to support four RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis

ΓùÅ   Support for all nine RMON groups through the use of a Cisco SwitchProbe analyzer (SPAN) port, which permits traffic monitoring of a single port, a group of ports, or the entire switch from a single network analyzer or RMON probe

ΓùÅ   Analysis support, including ingress port, egress port, and VLAN SPAN

ΓùÅ   Layer 2 traceroute

ΓùÅ   Remote SPAN (RSPAN)

ΓùÅ   Cisco Smartports macros

ΓùÅ   SPAN ACL filtering

ΓùÅ   Dynamic Host Configuration Protocol (DHCP) client autoconfiguration

ΓùÅ   IfIndex persistence

ΓùÅ   HTTPS

ΓùÅ   Time Domain Reflectometry (TDR)

ΓùÅ   MAC address notification

ΓùÅ   Onboard failure logging (OBFL)

ΓùÅ   Network Mobility Service Protocol (NMSP)

Advanced Security

ΓùÅ   TACACS+ and RADIUS, which enable centralized control of the switch and restrict unauthorized users from altering the configuration

ΓùÅ   Standard and extended ACLs on all ports

ΓùÅ   IEEE 802.1X user authentication (with VLAN assignment, port security, voice VLAN, and guest VLAN extensions)

ΓùÅ   IEEE 802.1X accounting

ΓùÅ   IEEE 802.1X authentication failure

ΓùÅ   IEEE 802.1X private VLAN assignment

ΓùÅ   IEEE 802.1X private guest VLAN

ΓùÅ   IEEE 802.1X RADIUS-supplied timeout

ΓùÅ   IEEE 802.1X MAC-Auth-Bypass

ΓùÅ   IEEE 802.1X inaccessible authentication bypass

ΓùÅ   Cisco Network Admission Control (NAC) Layer 2 IEEE 802.1X

ΓùÅ   Cisco NAC Layer 2 IP

ΓùÅ   Cisco NAC Layer 2 IP inaccessible authentication bypass

ΓùÅ   Trusted boundary

ΓùÅ   Router ACLs (RACLs) on all ports (no performance penalty)

ΓùÅ   VLAN ACLs (VACLs)

ΓùÅ   Port ACLs (PACLs)

ΓùÅ   PVLANs on access and trunk ports

ΓùÅ   VTPv3

ΓùÅ   DHCP snooping

ΓùÅ   DHCP Option 82

ΓùÅ   DHCP Option 82 insertion

ΓùÅ   DHCP Option 82 pass-through

ΓùÅ   Port security

ΓùÅ   Port security for PVLAN ports

ΓùÅ   Trunk port security

ΓùÅ   Sticky port security

ΓùÅ   Secure Shell (SSH) Protocol Versions 1 and 2

ΓùÅ   VLAN Management Policy Server (VMPS) client

ΓùÅ   Unicast MAC filtering

ΓùÅ   Unicast port flood blocking

ΓùÅ   Dynamic Address Resolution Protocol (ARP) inspection switch and restriction of unauthorized users from altering the configuration

ΓùÅ   IP Source Guard

ΓùÅ   Community PVLAN

ΓùÅ   Control plane policing

ΓùÅ   IEEE 802.1X unidirectional controlled port

ΓùÅ   Voice VLAN sticky port security

ΓùÅ   Secure Copy Protocol (SCP)

ΓùÅ   IEEE 802.1X inaccessible authentication bypass

ΓùÅ   MAC authentication bypass

ΓùÅ   Cis

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