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Product Overview
Q. What are the Cisco® Catalyst® 3750 Series Switches?
A. The Cisco Catalyst 3750 Series Switches are a premier line of enterprise-class, stackable, multilayer switches that provide high availability, security, and quality of service (QoS) to enhance the operation of the network. Their innovative unified stack architecture sets the standard in stack management, redundancy, and failover.
With a range of Fast Ethernet, Gigabit Ethernet, and an integrated wireless LAN controller configurations, the Cisco Catalyst 3750 Series can serve as both a powerful access layer switch for medium enterprise wiring closets and as a backbone switch for mid-sized networks. Customers can deploy network-wide intelligent services, such as advanced QoS, rate-limiting, Cisco Systems® security access control lists (ACLs) at L2, L3, and L4, multicast management, and high-performance IP routing-while maintaining the simplicity of traditional LAN switching. Embedded in the Cisco Catalyst 3750 Series is the switch device manager which allows users to configure and troubleshoot the Cisco Catalyst 3750 Switch using a standard Web browser.
The Cisco Network Assistant, available for the Cisco Catalyst 3750 Series at no charge, is a centralized management application that simplifies the administration tasks for Cisco switches, routers, and wireless access points. Cisco Network Assistant provides configuration wizards that greatly simplify the implementation of converged networks and intelligent network services.
Table 1 shows the complete list of Cisco Catalyst 3750 Series Intelligent Ethernet Switches.
With a range of Fast Ethernet, Gigabit Ethernet, and an integrated wireless LAN controller configurations, the Cisco Catalyst 3750 Series can serve as both a powerful access layer switch for medium enterprise wiring closets and as a backbone switch for mid-sized networks. Customers can deploy network-wide intelligent services, such as advanced QoS, rate-limiting, Cisco Systems® security access control lists (ACLs) at L2, L3, and L4, multicast management, and high-performance IP routing-while maintaining the simplicity of traditional LAN switching. Embedded in the Cisco Catalyst 3750 Series is the switch device manager which allows users to configure and troubleshoot the Cisco Catalyst 3750 Switch using a standard Web browser.
The Cisco Network Assistant, available for the Cisco Catalyst 3750 Series at no charge, is a centralized management application that simplifies the administration tasks for Cisco switches, routers, and wireless access points. Cisco Network Assistant provides configuration wizards that greatly simplify the implementation of converged networks and intelligent network services.
Table 1 shows the complete list of Cisco Catalyst 3750 Series Intelligent Ethernet Switches.
Table 1. Cisco Catalyst 3750 Series Switches
Q. What software images do the Cisco Catalyst 3750 Series Switches support?
A. The Cisco Catalyst Switches are available with the IP Base Image or the IP Services Image.
The IP Services Image enables a richer set of enterprise-class features including:
The IP Services Image enables a richer set of enterprise-class features including:
• Dynamic Routing Protocols:
– Open Shortest Path First (OSPF)
– Enhanced IGRP (EIGRP)
– Border Gateway Protocol Version 4 (BGPv4)
• Policy-based Routing (PBR)
– Allows superior control by enabling flow redirection regardless of the routing protocol configured
• Protocol-Independent Multicast (PIM)
– For IP multicast routing within a network that enables the network to receive the multicast feed requested and for switches not participating in the multicast to be pruned-support for PIM sparse mode (PIM-SM), PIM dense mode (PIM-DM), and PIM sparse-dense mode
• Distance Vector Multicast Routing Protocol (DVMRP)
– Tunneling for interconnecting two multicast-enabled networks across non-multicast networks
• Private VLAN (PVLAN)
– Provides the ability to restrict communications between hosts at layer 2 through the use of primary and secondary VLANs.
Cisco provides the flexibility to upgrade to the IP Services Image after the initial deployment through an IP Services Image upgrade kit. Additional details are provided later in this document.
Q. Can I enable static IP routing using the IP Base Image?
A. Yes, RIP and static routing are supported on the IP Base Image. Dynamic IP routing protocols (OSPF, BGPv4, EIGRP) are available only on the IP Services Image.
Q. Is the IP Services Image required to allow Layer 3 and Layer 4 lookups for QoS and security?
A. No. Both the IP Base Image and the IP Services Image allow for Layer 3 and Layer 4 lookups for QoS and security.
Q. Do the Cisco Catalyst 3750 Series Switches support Inter-Switch Link (ISL) virtual LAN (VLAN) trunking?
A. Yes, the Cisco Catalyst 3750 Series Switches support both 802.1Q trunking and ISL trunking. VLAN trunks can be created from any port using either standards-based 802.1Q tagging or the Cisco ISL VLAN architecture.
Q. Can the Cisco Catalyst 3750 Series Switches stack with the Cisco Catalyst 3550 Series Switches?
A. No, the Cisco Catalyst 3750 Series Switches cannot stack with the Cisco Catalyst 3550 Series Switches. The Cisco Catalyst 3750 Series Switches' new innovative Cisco StackWise™ technology with a 32 Gbps high-speed stack interconnect is not compatible with the Cisco Catalyst 3550 Series Switches' GigaStack® stacking.
Q. What is the difference between the 3750G-24TS and the 3750G-24TS-1U?
A. Physically, the 3750G-24TS is a 1.5 RU unit while the 3750G-24TS-1U is 1 RU in height.
The 3750G-24TS-1U has a larger Flash memory (32Mb vs. 16Mb) and consumes less power (100W vs. 190W) than the 3750G-TS. There are no differences in features or functionality between the 2 SKUs.
The 3750G-24TS-1U has a larger Flash memory (32Mb vs. 16Mb) and consumes less power (100W vs. 190W) than the 3750G-TS. There are no differences in features or functionality between the 2 SKUs.
Q. Are the Cisco Catalyst 3750G 48-port units oversubscribed?
A. Yes. There's a 52 to 32 Gbps oversubscription.
Q. What is the difference between the 3560G and the 3750G?
A. The 3560G SKUs are the standalone versions of 3750G. The 3560G SKUs do not implement the Cisco StackWise technology found on the Cisco Catalyst 3750 Series.
Q. What is the difference between the 4948G, 3750G, and 3560G 48 port units?
A. The 4948G is a full wire-rate box with a 96 Gbps, non-blocking, full-duplex switching fabric based on the Cisco Catalyst 4500 K-2 architecture, providing 72 million packets-per-second of switching capacity. It has removable redundant power supplies and a removable automatic variable speed fan tray. The 4948G series is also available with DC power supplies which aren't available on most 3750 or 3560 SKU's. The 3750G and 3560G 48 port units have oversubscribed switching backplane (52-to-32 Gbps oversubscription) and only have 1 power supply and fixed fan units. The 3750G units can stack together with other Cisco Catalyst 3750 Series or 3750G units using StackWise technology to form a single virtual switching unit. The 3560G is a standalone switch.
Q. Is the Cisco Catalyst 3750G-12S-SD the only DC powered model planned for the Cisco Catalyst 3750 Series family?
A. Yes. There are no plans for additional DC powered models in the Cisco Catalyst 3750 Series family.
Technology Overview
Q. What is Cisco StackWise technology?
A. Cisco StackWise technology provides an innovative method for collectively using and extending the resources of a stack of units. Up to nine switches can be joined together to create a single switching unit with a virtual 32 Gbps stack interconnect. Furthermore, the entire stack can be managed as one unit with a single IP address. To the rest of the network, the stack operates as a single switch. With a unified management interface, the customer can with one command load a single image to all compatible switches on the stack. Cisco StackWise technology is optimized for Gigabit Ethernet deployment bringing customers new levels of performance through the high speed interconnect, resiliency through advanced failover mechanisms and ease of use through automated configuration and a single management interface.
Because of the Cisco StackWise technology, the Cisco Catalyst 3750 Series is highly scalable. There can be up to 468 Gigabit Ethernet ports in a stack. Switches within the stack can be added and removed without affecting user network access. New devices get the global configuration from the stack master, and replacement devices get the exact configuration of the old device. There is one configuration file with all stack member configurations. Its innovative design sets the bar of availability in stackable switches. It supports link and switch level redundancy. The Cisco Catalyst 3750 Series supports cross-stack EtherChannel® as well as Cross-Stack UplinkFast (with subsecond failover), and cross-stack equal cost routes across different switches in the stack. These features eliminate the need of relying on HSRP for router failures. In the case of Master switch failure, another Master switch takes over with minimal disruption within 2 to 3 seconds.
For more information about Cisco StackWise technology, go to: http://www.cisco.com/go/catalyst3750.
Because of the Cisco StackWise technology, the Cisco Catalyst 3750 Series is highly scalable. There can be up to 468 Gigabit Ethernet ports in a stack. Switches within the stack can be added and removed without affecting user network access. New devices get the global configuration from the stack master, and replacement devices get the exact configuration of the old device. There is one configuration file with all stack member configurations. Its innovative design sets the bar of availability in stackable switches. It supports link and switch level redundancy. The Cisco Catalyst 3750 Series supports cross-stack EtherChannel® as well as Cross-Stack UplinkFast (with subsecond failover), and cross-stack equal cost routes across different switches in the stack. These features eliminate the need of relying on HSRP for router failures. In the case of Master switch failure, another Master switch takes over with minimal disruption within 2 to 3 seconds.
For more information about Cisco StackWise technology, go to: http://www.cisco.com/go/catalyst3750.
Q. What are Small Form-Factor Pluggables (SFPs)?
A. Small Form-Factor Pluggables (SFPs) are transceivers that provide Gigabit Ethernet connectivity from the Cisco Catalyst 3750 Series Switches to distribution layer switches. They are functionally equivalent to Gigabit Interface Converters (GBICs), but are much smaller.
Q. What SFPs are supported on Cisco Catalyst 3750 Series Switches?
A. Cisco Catalyst 3750 Series Switches support the following SFPs:
• 1000BASE-LX/LH (GLC-LH-SM=)
• 1000BASE-SX (GLC-SX-SM=)
• 1000BASE-ZX (GLC-ZX-SM=)
• 1000BASE-T (GLC-T=)
• 1000BASE-BX 1490nm (GLC-BX-D=) (12.2(25)SEB and later)
• 1000BASE-BX 1310nm (GLC-BX-U=) (12.2(25)SEB and later)
• CWDM (supported after 12.1(14) EA release)
– CWDM-SFP-1470
– CWDM-SFP-1490
– CWDM-SFP-1510
– CWDM-SFP-1530
– CWDM-SFP-1550
– CWDM-SFP-1570
– CWDM-SFP-1590
– CWDM-SFP-1610
• 100Base FX (12.2(20)SE and later)
Q. Can the 1000BASE-T SFP support 10/100/1000 speeds?
A. Yes, the 1000BASE-T SFP can support 10/100/1000 speeds on the Cisco Catalyst 3750 Series Switches. Please refer to the 1000BASET-T SFP Compatibility Matrix for information about support on other Cisco products.
Q. Do the Cisco Catalyst 3750 Series Switches interoperate with SFPs from other vendors?
A. Yes, starting from 12.2(25)SE release, the user has the option via CLI to turn on the support for 3rd party SFPs. However, the Cisco TAC will not support such 3rd party SFPs. In the event of any link error involving such 3rd party SFPs the customer will have to replace 3rd party SFPs with Cisco SFPs before any troubleshooting can be done by TAC.
Q. Is there a limit to the number of SFPs that can be used on a Cisco Catalyst 3750 Series Switch?
A. No. Users can populate all the SFP ports of any Cisco Catalyst 3750 Series Switch with the same SFP or with a combination of different Cisco SFPs.
Q. What are XENPAKS?
A. XENPAKs are transceivers that provide Ten Gigabit Ethernet connectivity on the Cisco Catalyst WS-C3750G-16TD switches.
Q. Which XENPAKs are supported on the Cisco Catalyst WS-C3750G-16TD switches?
A. The Cisco Catalyst WS-C3750G-16TD switches currently support ER, LR, and SR (limited orderability) XENPAKs.
Q. What performance of the 10 Gigabit Ethernet port on the Cisco Catalyst WS-C3750G-16TD switches?
A. The Ten Gigabit Ethernet uplink on the Cisco Catalyst WS-C3750G-16TD switches is 1.25:1 oversubscribed and provides maximum throughput of 8Gb/s.
Q. Do the Cisco Catalyst WS-C3750G-16TD switches use the same XENPAKs as other Cisco products?
A. Sometimes, The correct XENPAK product IDs for Cisco Catalyst WS-C3750G-16TD switches are:
• XENPAK-10GB-ER
• C3-XENPAK10GB-LR=
• C3-XENPAK10GB-SR= (limited orderability)
Q. Do the Cisco Catalyst 3750 Series Switches have Redundant Power Supply (RPS) support?
A. Yes. The Cisco Catalyst 3750 Series Switches can be supported by the Cisco RPS 675 and the Cisco RPS 300.
Both the Cisco RPS 675 and RPS 300 provide superior internal power source redundancy for up to six Cisco networking devices. This results in improved fault tolerance and network uptime. For more information go to http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/rps675/index.htm.
Both the Cisco RPS 675 and RPS 300 provide superior internal power source redundancy for up to six Cisco networking devices. This results in improved fault tolerance and network uptime. For more information go to http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/rps675/index.htm.
Q. Does it cost more for a Layer 3 or special-features license?
A. The Cisco Catalyst 3750-24TS-E, 3750-24PS-E, 3750-48TS-E, 3750-48PS-E, 3750G-24T-E, 3750G-24TS-E, 3750G-24TS-E1U, 3750G-24PS-E, 3750G-48TS-E, 3750G-48PS-E, 3750G-16TD-E, and 3750G-12S-E are loaded with the IP Services Software Image which is included in the standard list price. However, the Cisco Catalyst 3750-24TS-S, 3750-24PS-S, 3750-24FS-S, 3750-48TS-S, 3750-48PS-S, 3750G-24T-S, 3750G-24TS-S, 3750G-24TS-S1U, 3750G-24PS-S, 3750G-48TS-S, 3750G-48PS-S, 3750G-16TD-S, 3750G-12S-S, and 3750G-12S-SD switches are loaded with the IP Base Software Image. Cisco Catalyst 3750-24TS-S, 3750-24TS-S1U, and 3750-48TS-S can be upgraded to the IP Services Software Image with the purchase of the IP Services Software Image upgrade kit (part number CD-3750-EMI=) for $1995. The Cisco Catalyst 3750G-24T-S, 3750G-24TS-S, 3750G-16TD-S, 3750G-12S-S, and 3750G-12S-SD can be upgraded to the IP Services Software Image with the purchase of the IP Services Software Image upgrade kit for 24 port or less 3750GE models (part number CD-3750G-EMI=) for $3995. The Cisco Catalyst 3750G-48T-S and the 3750G-48PS-S can be upgraded to the IP Services Software Image with the purchase of the IP Services Software Image upgrade kit for 48 port 3750GE models (part number CD-3750G-48EMI=) for $7995. The IP Base Software Image includes RIP and static routing. For dynamic IP routing features (BGPv4, OSFP, EIGRP, IGRP), the IP Services Image is required.
Q. What features are only supported on the IP Services Image?
A. The following features and functionality are supported with the IP Services Image:
• Dynamic IP routing protocols for load balancing and constructing scalable LANs:
– Open Shortest Path First (OSPF)
– Enhanced IGRP (EIGRP)
– Border Gateway Protocol (BGPv4)
• Equal-cost routing for load balancing and redundancy
• Fallback bridging for forwarding of non-IP traffic between two or more VLANs
• Protocol-Independent Multicast (PIM) for IP multicast routing within a network that enables the network to receive the multicast feed requested and for switches not participating in the multicast to be pruned-support for PIM sparse mode (PIM-SM), PIM dense mode (PIM-DM), and PIM sparse-dense mode
• Distance Vector Multicast Routing Protocol (DVMRP) tunneling for interconnecting two multicast-enabled networks across non-multicast
• Policy-based Routing (PBR) allows superior control by enabling flow redirection regardless of the routing protocol configured
• Private VLAN (PVLAN) provides the ability to restrict communications between hosts at layer 2 through the use of primary and secondary VLANs.
Intelligent Switching
Q. Why do I need intelligence at the edge of my network?
A. Networks are evolving to address four new developments at the network edge:
• Increased desktop computing power
• Introduction of bandwidth-intensive applications
• Expansion of highly sensitive data on the network
• Presence of multiple device types, such as IP phones and wireless LAN access points
These new demands are contending for resources with many existing mission-critical applications. As a result, IT professionals must view the edge of the network as critical to effectively manage the delivery of information and applications. As companies increasingly rely on networks as the strategic business infrastructure, it is more important than ever to help ensure their high availability, security, scalability, and control. By adding Cisco intelligent functions to the wiring closet, customers can now deploy network-wide intelligent services that address these requirements in a consistent way from the desktop to the core and through the WAN.
With Cisco Catalyst Intelligent Ethernet switches, Cisco helps companies to realize the full benefits of adding intelligent services to their networks. Deploying capabilities that make the network infrastructure highly available to accommodate time-critical needs, scalable to accommodate growth, secure enough to protect confidential information, and capable of differentiating and controlling traffic flows are key to further optimizing network operations.
Q. Can you provide more details on how Cisco intelligent switching will help my network?
A. New applications are requiring higher bandwidth and the need to differentiate and control the traffic flow. Applications such as enterprise resource planning (ERP) (Oracle, SAP, etc.), voice (IP telephony traffic) and CAD/CAM require prioritization over less time-sensitive applications such as FTP or Simple Mail Transfer Protocol (SMTP). It would be highly undesirable to have a large file download destined to one port on a wiring closet switch and have quality implications such as increased latency in voice traffic, destined to another port on this switch. This condition is avoided by helping ensure that voice traffic is properly classified and prioritized throughout the network. Cisco Intelligent Ethernet switches implement superior quality of service (QoS) to help ensure that network traffic is classified, prioritized, and congestion is avoided.
Integrated Wireless LAN Controller
Q. What is the Cisco® Catalyst® 3750G Integrated Wireless LAN Controller?
A. The Cisco Catalyst 3750G Integrated Wireless LAN Controller is a Cisco 4400 Series Wireless LAN (WLAN) Controller integrated into the Cisco Catalyst 3750G switch. It works in conjunction with Cisco Aironet® Series lightweight access points, the Cisco Wireless Control System (WCS), and the Cisco Wireless Location Appliance to deliver a highly secure and unified wireless solution that supports mission-critical wireless data, voice, and video applications.
Q. Is the Cisco Catalyst 3750G Integrated WLAN Controller part of the Cisco Wireless LAN Controller product line?
A. Yes. The Cisco Wireless LAN Controller product line also includes Cisco 2000, 4100, and 4400 series wireless LAN controllers as well as the Cisco Wireless LAN Controller Module for Cisco Integrated Services Routers and Wireless Services Module for Cisco Catalyst 6500 Series Switches.
Q. What features are supported by the Cisco Catalyst 3750G Integrated Wireless LAN Controller?
A. The Cisco Catalyst 3750G Integrated Wireless LAN Controller supports the following features:
• Integrates WLAN controller functions into the highest resiliency stackable Cisco Catalyst 3750G Switch delivering improved operating efficiency, unparalleled WLAN security, intelligent protection switching (IPS), RF management, quality of service (QoS), and Layer 3 fast secure roaming
• Intelligent, adaptive real-time RF management for self-configuration, self-healing, and self-optimization
• Enterprise reliability for automated recovery from failures and mission-critical wireless networks
• Enterprise scalability for business-critical wireless services for deployments of all sizes
• Enterprise-class security with support for Wi-Fi security standards and flexible security policies that are adaptable to changing corporate security needs
• Intrusion detection, location, and contai