Cisco Catalyst 4948 Switch [Cisco Catalyst 4900 Series Switches]

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) optics¹. 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 (Figures 1 and 2).

Figure 1. Cisco Catalyst 4948 Series Switch

Figure 2. Rear View of Cisco Catalyst 4948 with Dual Redundant Power Supplies and Removable Fan Tray

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 maximum 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.

Cisco VFrame Data Center Support

Cisco VFrame Data Center (DC) discovers Cisco Catalyst 4900 Series Switches in a Layer 2 topology. Application networks using Cisco Catalyst 4900 Series Switches can now be provisioned rapidly through the automated requirements-based deployment model that Cisco VFrame DC offers. Important features of this support include the following:

• Cisco Catalyst 4900 Series Switches and Layer 2 topology discovery

• VLAN discovery and creation

• Port VLAN memberships

• Cisco EtherChannel® and network interface card (NIC) teaming configurations

• Macro-based port configurations

For more information, please visit: http://www.cisco.com/en/US/products/ps8463/index.html

Software Configuration Options

Table 1 summarizes the software configuration options for the Cisco Catalyst 4948.

Table 1. Software Configuration Options for Cisco Catalyst 4948

Software Image	Description
IP Base image	Standard Layer 3 image, including Routing Information Protocol Version 1 (RIPv1), RIPv2, static routes, and Enhanced Interior Gateway Routing Protocol (EIGRP) stub
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

Feature Comparison

Table 2 compares the features of the Cisco Catalyst 4948 Switch, Catalyst 4948 10 Gigabit Ethernet Switch, and Catalyst 4900M Switch.

Table 2. 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	250 mpps for IPv4 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 Small Form-Factor Pluggable (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	28,000 (Layer 3) 16,000 (Layer 2)	28,000 (Layer 3) 16,000 (Layer 2)	56,000 for IPv4 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 in both Data sheets

Features and Specifications At A Glance

Performance and Switching

• 96 Gbps nonblocking switch fabric

• 72 mpps Layer 2 forwarding (hardware)

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

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

• Unicast and multicast routing entries: 32,000

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

• Layer 2 multicast addresses: 16,384

• MAC addresses: 32,768

• Policers: 512 ingress and 512 egress

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

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

• Latency: 6 microseconds for 64-byte packets

• SVIs: 2048

• Spanning Tree Protocol instances: 1500

• Internet Group Management Protocol (IGMP) snooping entries: 8000

Layer 2 Features

• Layer 2 hardware forwarding at 72 mpps

• Layer 2 switch ports and VLAN trunks

• IEEE 802. 1Q VLAN encapsulation

• Inter-Switch Link (ISL) VLAN encapsulation

• Dynamic Trunking Protocol (DTP)

• VLAN Trunking Protocol (VTP) and VTP domains

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

• Flexlink

• Spanning Tree PortFast and PortFast Guard

• Spanning Tree UplinkFast and BackboneFast

• IEEE 802.1s

• IEEE 802.1w

• IEEE 802.3ad

• Spanning Tree Root Guard

• Cisco Discovery Protocol Version 1 and 2

• IGMPv1, v2, and v3

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

• Port Aggregation Protocol (PAgP)

• Link Aggregation Control Protocol (LACP)

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

• IEEE 802.1 QinQ in hardware

• Layer 2 protocol tunneling

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

• Baby giants (up to 1600 bytes)

• Unidirectional Ethernet

• Hardware-based storm control (formally known as broadcast and multicast suppression)

• Community private VLANs (PVLANs)

• Forced 10/100 autonegotiation

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

• Private VLAN promiscuous trunk

• Layer 2 promiscuous trunk over trunk port (L2PT)

• Class-of-service (CoS) mutation

• E-OAM 802.3ah and CFM: 802.1ag

Layer 3 Features

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

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

• Static IP routing

• IP routing protocols: EIGRP, OSPF, RIP, and RIP2

• BGPv4 and Multicast Border Gateway Protocol (MBGP)

• Nonstop Forwarding (NSF) awareness

• Hot Standby Router Protocol (HSRP)

• Software routing of IPX and AppleTalk

• IS-IS routing protocol

• IGMPv1, v2, and v3

• IGMP filtering on access and trunk ports

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

• Auto rendezvous point (Auto-RP)

• Multicast routing protocol (DVMRP)

• Pragmatic General Multicast (PGM)

• Cisco Group Management Protocol (GMP) server

• Full Internet Control Message Protocol (ICMP) support

• ICMP Router Discovery Protocol

• Policy-based routing (PBR)

• Virtual Route Forwarding lite (VRF-lite)

• IPv6 software switching support

• OSPF fast convergence

• EIGRP stub

• Virtual Router Redundancy Protocol (VRRP)

• IP unnumbered for SVI

• Nonstop Forwarding (NSF) awareness

• WCCPv2

• Gateway Load Balancing Protocol (GLBP)

High-Availability Features

• 1+1 hot swappable AC or DC power supplies

• Hot-swappable field replaceable fan tray with redundant fans

• HSRP

• VRRP

• Cisco IOS Embedded Event Manager (EEM)

• Cisco Generic Online Diagnostics (GOLD)

Sophisticated QoS and Traffic Management

• Per-port QoS configuration

• Per-port and per-VLAN QoS

• Support for four queues per port in hardware

• Strict priority queuing

• IP differentiated services code point (DSCP) and IP Precedence

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

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

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

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

• Shaping and sharing output queue management

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

• No performance penalty for granular QoS functions

• Matched CoS for non-IPv4 traffic

Predictable Performance

• 96-Gbps switching fabric

• Layer 2 hardware forwarding at 72 mpps

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

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

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

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

• Support for 32,768 MAC addresses

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

• Support for 512 ingress policers and 512 egress policers

• Support for 32,000 ACL and QoS entries

• Scalability to 2048 virtual ports (VLAN port instances)

• Scalability to 8000 IGMP snooping entries

• Scalability to 1500 Spanning Tree Protocol instances

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

• Hardware-based wire-speed multicast management

• Hardware-based wire-speed ACLs

Comprehensive Management

• 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

• Manageable through Cisco Network Assistant

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

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

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

• Support for all nine RMON groups through the use of a Cisco SwitchProbe analyzer (Switched Port 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

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

• Layer 2 traceroute

• Remote SPAN (RSPAN)

• Cisco SmartPort macros

• SPAN ACL filtering

• Dynamic Host Configuration Protocol (DHCP) client autoconfiguration

• IfIndex persistence

• HTTPS

• Time Domain Reflectometry (TDR)

• MAC address notification

Advanced Security

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

• Standard and extended ACLs on all ports

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

• IEEE 802.1x accounting

• IEEE 802. 1x authentication failure

• IEEE 802. 1x private VLAN assignment

• IEEE 802. 1x private guest VLAN

• IEEE 802. 1x RADIUS-supplied timeout

• IEEE 802.1x MAC-Auth-Bypass

• IEEE 802.1x inaccessible authentication bypass

• Cisco Network Admission Control (NAC) Layer 2 IEEE 802.1x

• Cisco NAC Layer 2 IP

• Cisco NAC Layer 2 IP inaccessible authentication bypass

• Trusted boundary

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

• VLAN ACLs (VACLs)

• Port ACLs (PACLs)

• PVLANs on access and trunk ports

• DHCP snooping

• DHCP Option 82

• DHCP Option 82 insertion

• DHCP Option 82 pass-through

• Port security

• Port security for PVLAN ports

• Trunk port security

• Sticky port security

• Secure Shell (SSH) Protocol Versions 1 and 2

• VLAN Management Policy Server (VMPS) client

• Unicast MAC filtering

• Unicast port flood blocking

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

• IP Source Guard

• Community PVLAN

• Control plane policing

• IEEE 802.1x unidirectional controlled port

• Voice VLAN sticky port security

• Secure Copy Protocol (SCP)

• IEEE 802.1x inaccessible authentication bypass

• MAC authentication bypass

• Cisco EtherChannel trunk port security

Traffic and Congestion Management

• Number of queues: Four queues per port

• Type of buffers: Dynamic

Switch Architecture

• Packet buffering: Dynamic, 16 MB shared memory

• CPU speed: 266 MHz

• Flash memory: 64 MB

• SDRAM: 256 MB

Management

• Enhanced Object Tracking (EOT)

• IP service-level agreement (SLA)

• CiscoWorks LAN Management Solution (LMS), including CiscoWorks Resource Manager Essentials

• CiscoWorks CiscoView

• Cisco Network Assistant (CNA)

• BGP4-MIB.my

• BRIDGE-MIB.my (RFC 1493)

• CISCO-BULK-FILE-MIB.my

• CISCO-CDP-MIB.my

• CISCO-CLASS-BASED-QOS-MIB.my

• CISCO-CONFIG-COPY-MIB.my

• CISCO-CONFIG-MAN-MIB.my

• CISCO-ENTITY-ASSET-MIB.my

• CISCO-ENTITY-EXT-MIB.my

• CISCO-ENTITY-FRU-CONTROL-MIB.my

• CISCO-ENTITY-SENSOR-MIB.my

• CISCO-ENTITY-VENDORTYPE-OID-MIB.my

• CISCO-ENVMON-MIB.my

• CISCO-FLASH-MIB.my

• CISCO-FTP-CLIENT-MIB.my

• CISCO-HSRP-MIB.my

• CISCO-IETF-IP-MIB.my

• CISCO-IETF-IP-FORWARD-MIB.my

• CISCO-IETF-ISIS-MIB.my

• CISCO-IF-EXTENSION-MIB.my

• CISCO-IGMP-FILTER-MIB.my

• CISCO-IMAGE-MIB.my

• CISCO-IPMROUTE-MIB.my

• CISCO-L2-TUNNEL-CONFIG-MIB.my

• CISCO-L2L3-INTERFACE-CONFIG-MIB.my

• CISCO-LAG-MIB.my

• CISCO-MEMORY-POOL-MIB.my

• CISCO-NDE-MIB.my

• CISCO-PAGP-MIB.my

• CISCO-PAE-MIB.my

• CISCO-PING-MIB.my

• CISCO-PORT-SECURITY-MIB.my

• CISCO-PORT-STORM-CONTROL-MIB.my

• CISCO-PRIVATE-VLAN-MIB.my

• CISCO-PROCESS-MIB.my

• CISCO-PRODUCTS-MIB.my

• CISCO-RF-MIB.my

• CISCO-RMON-CONFIG-MIB.my

• CISCO-RTTMON-MIB.my

• CISCO-STP-EXTENSIONS-MIB.my

• CISCO-SYSLOG-MIB.my

• CISCO-VLAN-IFTABLE-RELATIONSHIP-MIB.my

• CISCO-VLAN-MEMBERSHIP-MIB.my

• CISCO-VTP-MIB.my

• DOT3-MAU-MIB.my (RFC 3636)

• ENTITY-MIB.my

• ETHERLIKE-MIB.my

• EXPRESSION-MIB.my

• HC-RMON-MIB.my

• IEEE8021-PAE-MIB.my

• IEEE8023-LAG-MIB.my (802.3ad)

• IF-MIB.my

• IGMP-MIB.my

• IPMROUTE-MIB.my

• NOVELL-IPX-MIB.my

• NOVELL-RIP SAP-MIB.my

• OLD-CISCO-TS-MIB.my

• PIM-MIB.my

• RFC1213-MIB.my (MIB-II)

• RFC1243-MIB.my (APPLETALK MIB)

• RFC1253-MIB.my (OSPF-MIB)

• RMON-MIB.my (RFC 1757)

• RMON2-MIB.my (RFC 2021)

• SMON-MIB.my (Internet-Draft)

• SNMP-FRAMEWORK-MIB.my (RFC 2571)

• SNMP-MPD-MIB.my (RFC 2572)

• SNMP-NOTIFICATION-MIB.my (RFC 2573)

• SNMP-TARGET-MIB.my (RFC 2573)

• SNMP-USM-MIB.my (RFC 2574)

• SNMP-VACM-MIB.my (RFC 2575)

• SNMPv2-MIB.my

• TCP-MIB.my

• UDP-MIB.my

• RIP SNMP MIB

Industry Standards

• Ethernet: IEEE 802.3 and 10BASE-T

Hierarchical Navigation

Cisco Catalyst 4900 Series Switches

Cisco Catalyst 4948 Switch

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