August 16 At: 10:46 am
Cisco Catalyst 3750 Series Switch Quick Look
Cisco Catalyst 3750 Series Switch Quick Look with Q. and A.
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.
Table 1. Cisco Catalyst 3750 Series Switches
|
Part Number |
Description |
|
|
• 24 Ethernet 10/100/1000 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 rack unit (RU) stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full IP routing with BGPv4, EIGRP, OSPF, and PIM
|
|
|
• 24 Ethernet 10/100/1000 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 24 Ethernet 10/100/1000 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1.5 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full dynamic IP routing
|
|
|
• 24 Ethernet 10/100/1000 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1.5 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic Routing Information Protocol (RIP) and static routing, upgradeable to full dynamic IP routing
|
|
|
• 24 Ethernet 10/100/1000 ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full dynamic IP routing
|
|
|
• 24 Ethernet 10/100/1000 ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 12 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed provides full dynamic IP routing
|
|
|
• 12 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• SMI provides basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
WS-C3750G-12S-SD |
• 12 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• DC Power Supply
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• SMI provides basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• Sixteen 10/100/1000 Gigabit Ethernet ports
• One IEEE 802.3ae 10 Gigabit Ethernet XENPAK port
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed provides full dynamic IP routing
• IEEE 802.3ae 10 Gigabit Ethernet port is 1.25:1 oversubscribed
|
|
|
• Sixteen 10/100/1000 Gigabit Ethernet ports
• One IEEE 802.3ae 10 Gigabit Ethernet XENPAK port
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• IP Base Image installed provides basic RIP and static routing, upgradeable to full dynamic IP routing
• IEEE 802.3ae 10 Gigabit Ethernet port is 1.25:1 oversubscribed
|
|
|
• 24 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco prestandard PoE
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full IP routing with BGP-4, EIGRP, OSPF, PIM
|
|
|
• 24 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco prestandard PoE
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 48 Ethernet 10/100/1000 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full IP routing with BGPv4, EIGRP, OSPF, PIM
|
|
|
• 48 Ethernet 10/100/1000 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 48 Ethernet 10/100/1000 with IEEE 802.3af and Cisco prestandard PoE ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full IP routing with BGPv4, EIGRP, OSPF, PIM
|
|
WS-C3750G-24WS-S25 |
• 24 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco prestandard PoE
• 2 SFP-based Gigabit Ethernet ports
• Integrated Wireless LAN Controller
• Supports up to 25 access points
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 2 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
WS-C3750G-24WS-S50 |
• 24 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco prestandard PoE
• 2 SFP-based Gigabit Ethernet ports
• Integrated Wireless LAN Controller
• Supports up to 50 access points
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 2 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 48 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard PoE
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full dynamic IP routing
|
|
|
• 48 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard PoE
• 4 SFP-based Gigabit Ethernet port
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 48 Ethernet 10/100 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full dynamic IP routing
|
|
|
• 48 Ethernet 10/100 ports
• 4 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 24 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard PoE
• 2 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full dynamic IP routing
|
|
|
• 24 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard PoE
• 2 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 24 Ethernet 10/100 ports
• 2 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Services Image installed
• Full dynamic IP routing
|
|
|
• 24 Ethernet 10/100 ports
• 2 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
|
|
• 24 100BASE-FX ports
• 2 SFP-based Gigabit Ethernet ports
• 32 Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable, multilayer switch
• Enterprise-class intelligent services delivered to the network edge
• IP Base Image installed
• Basic RIP and static routing, upgradeable to full dynamic IP routing
|
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:
• 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.
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.
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.
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.
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 containment to preserve the integrity of wireless networks and sensitive corporate information
• Mobility management that allows users to roam between access points and across bridged and routed subnets without requiring changes to the underlying infrastructure
• Simplified deployment and management with zero-configuration deployment and intuitive management interfaces that provide better visibility and control of the air space for reduced operating costs
• High performance to support real-time applications such as voice
Q. What are the benefits of the Cisco Catalyst 3750G Integrated Wireless LAN Controller?
A. The Cisco Catalyst 3750G Integrated Wireless LAN Controller provides the control and reliability that IT managers need to build highly secure, business-class indoor and outdoor 802.11 wireless networks. From voice and data services and location tracking to wireless mesh networks, the Cisco Catalyst 3750G Integrated Wireless LAN Controller enables medium-sized organizations and enterprise branch offices to create and enforce policies that support business-critical applications.
Q. What is the scalability of the Cisco Catalyst 3750G Integrated Wireless LAN Controller?
A. The Cisco Catalyst 3750G Integrated Wireless LAN Controller scales to support up to 200 lightweight access points in one logical unit.
Q. Does the Cisco Catalyst 3750G Integrated Wireless LAN Controller support the same features as the Cisco 4400 Series Wireless LAN Controller?
A. The Cisco Catalyst 3750G Integrated Wireless LAN Controller supports the same features as the Cisco 4400 Series Wireless LAN Controller with the exception of the optional VPN module.
Q. What is the advantage of deploying the Cisco Catalyst 3750G Integrated Wireless LAN Controller?
A. Advantages of deploying the Cisco Catalyst 3750G Integrated Wireless LAN Controller include:
• Lower costs for deployments up to 200 access points
• Continued investment protection for existing users of Cisco Catalyst 3750G Switches with their high availability, high security, and QoS
• Ability of new wireless deployments to purchase a WLAN controller integrated into Cisco Catalyst 3750G Switches
• Fewer managed nodes in the network
• Tighter wired and wireless integration
Q. What is the available data throughput for the Cisco Catalyst 3750G Integrated Wireless LAN Controller?
A. The Cisco Catalyst 3750G Integrated Wireless LAN Controller has a 2-Gbps interface to the switch.
Q. How many Cisco Catalyst 3750G Integrated Wireless LAN Controllers are supported in a stack?
A. Up to four controllers are supported in one stack. Up to nine switches can be joined together to create a single switching unit with a virtual 32-Gbps stack interconnect.
Q. What fast secure roaming protocol is supported by the Cisco Catalyst 3750G Integrated Wireless LAN Controller?
A. Cisco Catalyst 3750G Integrated Wireless LAN Controller supports Proactive Key Caching (PKC), an extension to the 802.11i standard and precursor to the 802.11r standard that facilitates secure roaming with AES encryption and RADIUS authentication.
Security
Q. How will the security needs of a network be handled?
A. With the rise in internal threats to a network, Cisco Intelligent Ethernet switches enhance data security through a wide range of features including Secure Shell (SSH) and Simple Network Management Protocol version 3 (SNMPv3) protocols, ACLs, 802.1x, port security, private VLAN edge, Dynamic Host Configuration Protocol (DHCP) interface tracker, MAC address notification, and RADIUS/TACACS+. Depending on your security needs, the Cisco Catalyst 3750 Series complements devices such as firewalls, VPNs, and Intrusion Detection Systems.
Q. For security purposes, how can I protect unauthorized users from accessing my network?
A. The Cisco Catalyst 3750 Series supports 802.1x that works in conjunction with a RADIUS server to authenticate users as they access a network. The 802.1x standard is considered port-level security and is commonly used for wireless LANs. Additionally, portions of the network can be restricted by using ACLs. Access can be denied based on Media Access Control (MAC) addresses, IP addresses, or Transmission Control Protocol (TCP)/User Datagram Protocol (UDP) ports. ACL lookups are done in hardware-forwarding and routing performance is not compromised when implementing ACL-based security. An additional protection method is to use port security, which helps ensure the appropriate user is on the network by limiting access to the port based on MAC addresses.
Q. For security purposes, how can I monitor or track activities in my network?
A. Intrusion detection systems are tailored to monitor and track activities in a network. The Cisco Catalyst 3750 Series can complement this through features such as MAC address notification, which will send an alert to a management station so that network administrators know when and where users came on to the network and can take appropriate actions. The DHCP Interface Tracker (Option 82) feature will track where a user is physically connected on a network by providing both switch and port ID to a DHCP server.
Q. For security purposes, how do I protect administration passwords and traffic going to the switch during configuration or troubleshooting?
A. To protect administration traffic during the configuration or troubleshooting of a switch (such as passwords or device configuration settings), the best approach is to encrypt the datBoth SSH and SNMPv3 provide encryption of data during Telnet sessions and SNMP sessions.
Q. Does the Cisco Catalyst 3750 Series support SSH v2?
A. Yes.
Q. Is the private VLAN feature supported?
A. Yes, private VLAN is supported in the IP Services software image as of release 12.2(20)SE and in the IP Base software images as of release 12.2(25)SEB.
Q. Is full private VLAN feature supported?
A. Yes, IP Base Image supports full private VLAN feature starting 12.2(25)SEB. Prior to this release, full private VLAN was only available in IP Services and Advanced IP Services.
Q. What is the difference between the Private VLAN Edge (Protected Port) and Private VLAN features?
A. Private VLAN Edge feature is also known as Protected Port. It is roughly a limited subset of the full Private VLAN feature. The full Private VLAN feature supports primary and secondary VLANs and Community and Isolated VLANs, while Private VLAN Edge only supports the equivalent of Isolated VLAN.
Q. Are DAI (Dynamic ARP Inspection) and IPSG (IP Source Guard) supported?
A. Yes. Both of these features are supported in the IP Base Image as of release 12.2(25)SEB.
Power over Ethernet (PoE)
Q. Why do I need GE PoE?
A. Gigabit Ethernet over copper technology delivers all the benefits of Ethernet, while providing far greater speeds to support today’s most demanding applications. In addition, customers can use their existing Category 5 wiring infrastructure that they use for 10/100 Mbps connections. Since the PDs such as Phones and Access points are migrating to Gigabit Ethernet as well, the demand of GE PoE is increasing rapidly.
Q. How is Cisco Catalyst 3750G PoE delivered over GE pairs? How is that different than PoE over FE pairs?
A. The Cisco Catalyst 3750G POE switch delivers -48V DC power over GE data pairs 2 and 3 (i.e. pins 1, 2, 3 and 6) to the PDs, just as it would do over FE pairs.
Q. What PD devices support 10/100/1000 speeds?
A. The Cisco IP Phone 7971G-GE IP Phone supports 10/100/100 and 802.3af POE. It does not support Cisco pre-standard POE.
Q. Is there PoE on the SFP port if I use the 10/100/1000 SFP?
A. No, PoE supported on the 10/100/1000 copper ports, not on the SFP ports.
Q. What is Bi-directional CDP (PNP Power Negotiation Protocol) and is it supported on the DSBU PoE switches?
A. PNP enables High Power PDs to operate in high power mode on the Cisco Catalyst 3560 and the Cisco Catalyst 3750 PoE family switches. This protocol is supported on the Cisco Catalyst 3750 Series and the Cisco Catalyst 3560 PoE family switches. PNP is supported currently on Cisco 7970G Phones and is being phased into all high power PDS. When the High Power PDs are connected to the Cisco Catalyst 3560/3750 PoE family switches, the PD boots up in low power mode, and requests to move into high power mode by incrementing the request ID and sending a list of possible power modes. Upon receiving this request the switch will select the highest mode possible from the list of power modes. The decision on which power mode to select is based on hardware limits, current power available in the global power budget, and user configuration. The switch will set the available power CDP field to the chosen value and respond to the PD request. If a PD is denied transition to high power mode, it will not request again to transition, unless it is unplugged and re-plugged into the port.
Q. How does the static <max-wattage> CLI command work, does <max-wattage> override the PD’s advertised class?
A. The static cli command helps ensure that the high priority ports always have power available. This command enables the user to pre-allocate power per port at configuration time, before the switch discovers the powered device on that port. The switch reserves power for this port even when no device is connected and guarantees that power will be provided upon device detection. The default value of <max-wattage> is 15.4W per port. The power allocation is not readjusted when the switch finds out through IEEE classification or CDP protocol that a PD connected to the port is consuming less than configured <max-wattage>; However, if the PD requires more power than the configured <max-wattage), the PD will shutdown and a Syslog message is issued. If there is not enough power in the power budget then the switch cannot pre-allocate the power when a port is configured as “static”. In this case the switch will reject the cli command and a Syslog message is issued.
Q. What is Discovery and Disconnect timing restriction required by IEEE802.3af
A. The Cisco Catalyst 3560/3750 PoE switches detect the connected PD within 500ms. Upon successful detection, the switch turns on the power within 400ms. At the time of disconnect, power is removed from the port within 500ms.
Q. Does Cisco Catalyst 3750 PoE switch support the IEEE 802.3af standards-based implementation?
A. Yes, Cisco Catalyst 3750 PoE switches support both the Cisco pre-standard Power over Ethernet implementation as well as the IEEE 802.3af Power over Ethernet implementation.
Q. What method of disconnect does the Cisco Catalyst 3750 PoE support?
A. The Cisco Catalyst 3750 PoE switches support AC disconnect detection for both IEEE802.3af standard compliance and pre-standard Cisco PDs.
Q. What method of detection does the Cisco Catalyst 3750 PoE support?
A. The Cisco Catalyst 3750 PoE switches support both Cisco pre-standard Power over Ethernet and IEEE802.3af standards based detection method of detecting a PD. Both detection methods are active at the same time and either one can be used to detect a valid PD.
Q. Does the Cisco Catalyst 3750 PoE switches support power classification?
A. Yes, each Cisco Catalyst 3750-24PS or Cisco Catalyst 3750-48PS switch can optionally detect the PD Power Classification signature and budget the appropriate power. This reduces the maximum power that must be budgeted by the switch and provisioned in the wiring closet. The Cisco Catalyst 3750 PoE switches have 370W available for Power over Ethernet, which is shared by all 24/48 ports. The switch allocates the maximum power a PD needs.
Q. What is the maximum power per port that the Cisco Catalyst 3750 PoE can supply?
A. The maximum power supplied at the Cisco Catalyst 3750 PoE is 15.4W per port.
Q. How does Power Management work in the Cisco Catalyst 3750 PoE switches?
A. The Cisco Catalyst 3750-24PS switch supports a maximum of 15.4W per port of -48V DC power on all 24 ports over standard Category 3 and 5 unshielded twisted-pair (UTP) cable up to 100 meters, however all 48 10/100 ports in Cisco Catalyst 3750-48PS switch will be able to deliver 7.7W simultaneously and any given port can be configurable to support up to the maximum of 15.4 watts as long as the switch’s - 48V power capacity is not exceeded. The Cisco Catalyst 3750 PoE switches monitor and track the requests for power, and only grants power when it is available. If the connected PD draws more power, which results in exceeding the system power budget that is available on the switch, then power will be denied to that port and the PD will not power up. If power is denied, the switch re-checks the power budget periodically (every 15 seconds), and continues to attempt to grant the request for power. If power is granted, the switch updates the power budget. Additional power management features are described later in this section.