Cisco 3750 - Catalyst EMI Switch Installation guide

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Q & A
Cisco Catalyst 3750 Series Switches
Product Overview
Q. What are the Cisco®Catalyst®3750 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. Its innovative unified stack management raises the bar
in stack management, redundancy, and failover.
With a range of Fast Ethernet and Gigabit Ethernet 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 networkwide
intelligent services, such as advanced QoS, rate-limiting, Cisco security access control lists
(ACLs), multicast management, and high-performance IP routing—while maintaining the
simplicity of traditional LAN switching. Embedded in the Cisco Catalyst 3750 Series is the
Cisco Cluster Management Suite (CMS) Software, which allows users to simultaneously
configure and troubleshoot multiple Cisco Catalyst desktop switches using a standard
Web browser.
Cisco CMS Software provides new configuration wizards that greatly simplify the
implementation of converged applications and networkwide services.
Table 1 shows the complete list of Cisco Catalyst 3750 Series Intelligent Ethernet Switches.
Ta b l e 1 Cisco Catalyst 3750 Series Switches
Product
Name Part Number Description
Cisco Catalyst
3750-48
WS-C3750-48TS-E • 48 10/100 ports + 4 SFP-based Gigabit Ethernet
ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 rack unit (RU) stackable multilayer switch
• Delivers enterprise-class intelligent services to
the network edge
• Enhanced Multilayer Software Image (EMI)
installed
• Provides full dynamic IP routing

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Tab le 1 Cisco Catalyst 3750 Series Switches
Product Name Part Number Description
Cisco Catalyst
3750-48
WS-C3750-48TS-S • 48 10/100 ports + 4 SFPs
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• Standard Multilayer Software Image (SMI) installed
• SMI provides basic RIP and static routing, upgradable to full
dynamic IP routing
Cisco Catalyst
3750-24
WS-C3750-24TS-E • 24 10/100 ports + 2 SFP-based Gigabit Ethernet ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• EMI installed
• Provides full dynamic IP routing
Cisco Catalyst
3750-24
WS-C3750-24TS-S • 24 10/100 ports + 2 SFP-based Gigabit Ethernet ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• SMI installed
• SMI provides basic RIP and static routing, upgradable to full
dynamic IP routing
Cisco Catalyst
3750G-24TS
WS-C3750G-24TS-E • 24 10/100/1000 ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• EMI installed
• Provides full dynamic IP routing
Cisco Catalyst
3750G-24TS
WS-C3750G-24TS-S • 24 10/100/1000 ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• SMI installed
• SMI provides basic RIP and static routing, upgradable to full
dynamic IP routing

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Q. What software images do the Cisco Catalyst 3750 switches support?
A. The Cisco Catalyst switches are available with the SMI or the EMI.
The Enhanced Multilayer Software Image enables a richer set of enterprise-class features, including hardware-based
IP unicast and multicast routing, inter-VLAN routing, router access control lists (RACLs), and the Hot Standby
Router Protocol (HSRP). Flexibility to upgrade to EMI after the initial deployment is provided through an EMI
upgrade kit. Additional details about the differences between the SMI and EMI are provided later in this document.
Q. Can I enable static IP routing using the SMI?
A. Yes, RIP and static routing are supported on the SMI. Dynamic IP routing protocols (OSPF, BGPv4, EIGRP,
IGRP) are available only on the EMI.
Q. Is the EMI required to allow Layer 3 and Layer 4 lookups for QoS and security?
A. No. Both the SMI and the EMI allow for Layer 3 and Layer 4 lookups for QoS and security.
Q. Do the Cisco Catalyst 3750 switches support Inter-Switch Link (ISL) virtual LAN (VLAN) trunking?
A. Yes, the Cisco Catalyst 3750 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 switches cannot stack with the Cisco Catalyst 3550 switches. The Cisco Catalyst
3750 switches’ new innovative Cisco StackWise™ technology with 32-Gbps high-speed stacking bus is not
compatible with Cisco Catalyst 3550 switches’ GigaStack®stacking.
Cisco Catalyst
3750G-24T
WS-C3750G-24T-E • 24 10/100/1000 ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• EMI installed
• Provides full dynamic IP routing
Cisco Catalyst
3750G-24T
WS-C3750G-24T-S • 24 10/100/1000 ports
• 32-Gbps, high-speed stacking bus
• Innovative stacking technology
• 1 RU stackable multilayer switch
• Delivers enterprise-class intelligent services to the network edge
• SMI installed
• SMI provides basic RIP and static routing, upgradable to full
dynamic IP routing
Tab le 1 Cisco Catalyst 3750 Series Switches
Product Name Part Number Description

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Technology Overview
Q. What is Cisco StackWise technology?
A. The 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 252
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 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. SFPs are transceivers that provide Gigabit Ethernet connectivity from the Cisco Catalyst 3750 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 switches?
A. Cisco Catalyst 3750 switches support 1000BASE-LX/LH and 1000BASE-SX SFPs.
Q. Do the Cisco Catalyst 3750 switches interoperate with SFPs from other vendors?
A. No, like other Cisco switches and routers, the Cisco Catalyst 3750 switches do not interoperate with other
vendors’ SFPs. The switch will shut down the port if an SFP is inserted that is not a Cisco SFP.
Q. Is there a limit to the number of SFPs that can be used on a Cisco Catalyst 3750 Switch?
A. No. Users can populate all the SFP ports of any Cisco Catalyst 3750 Switch with the same SFP or with a
combination of different SFPs. Cisco Catalyst 3750 switches support the following Cisco SFPs: 1000BASE-SX and
1000BASE-LX/LH.

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Q. Do the Cisco Catalyst 3750 switches have Redundant Power Supply (RPS) support?
A. Yes. The Cisco Catalyst 3750 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/en/US/products/hw/accessor/ps2883/products_data_sheet09186a0080150e31.html.
Q. What is the difference between Cisco Redundant Power Supply 675 (RPS 675) and RPS 300?
A. The Cisco RPS 675 is the next-generation of the RPS 300. It provides more power (675W) than RPS 300 (300W).
RPS 675 can provide up to 375W of –48V power, and 300W of 12V power. Unlike the Cisco RPS 300, the RPS 675
comes up in active mode. The customer does not need to push a button to activate the RPS 675 after a power failure.
Q. Does it cost more for a Layer 3 or special-features license?
A. The Cisco Catalyst 3750-24TS-E, 3750-48TS-E, 3750G-24T-E, 3750G-24TS-E are loaded with the Enhanced
Multilayer Software Image, so all feature license fees are part of the standard list price. However, the Cisco Catalyst
3750-24TS-S, 3750-48TS-S, 3750G-24T-S, 3750G-24TS-S switches are loaded with the Standard Multilayer
Software Image; these switches can be upgraded to the Enhanced Multilayer Software Image with the purchase of the
Enhanced Multilayer Software Image upgrade kit (part number CD-3750-EMI=). The Standard Multilayer Software
Image includes RIP and static routing. For dynamic IP routing features (BGPv4, OSFP, EIGRP, IGRP), the EMI is
required.
Q. What features are only supported on the EMI?
A. The following features and functionality are supported with the Enhanced Multilayer Software Image:
• Dynamic IP routing protocols for load balancing and constructing scalable LANs:
–Open Shortest Path First (OSPF)
–Interior Gateway Routing Protocol (IGRP) and Enhanced IGRP (EIGRP)
–Border Gateway Protocol (BGPv4)
• Equal-cost routing for load balancing and redundancy
• Cisco standard and extended IP security Router RACLs for defining security policies on routed interfaces for
control plane and data plane traffic
• Fallback bridging for forwarding of non-IP traffic between two or more VLANs
• Cisco Hot Standby Router Protocol (HSRP) to create redundant failsafe routing topologies
• 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 nonmulticast networks
• Policy-based Routing (PBR) allows superior control by enabling flow redirection regardless of the routing
protocol configured

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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:
• Increase in 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 ensure their high availability, security, scalability, and control. By adding Cisco intelligent functions to
the wiring closet, customers can now deploy networkwide 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 ensuring that voice traffic is properly classified and prioritized throughout the network. Cisco
Intelligent Ethernet switches implement superior QoS to ensure that network traffic is classified, prioritized, and
congestion is avoided.
Security
Q. How will the security needs of a network be handled?
A. With the rise in internal threats to a network, Cisco 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 3550
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 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

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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 ensures 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
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 data. Both SSH and SNMPv3 provide encryption
of data during Telnet sessions and SNMP sessions.
Network Management
Q. Do the Cisco Catalyst 3750 switches support Cisco Switch Clustering technology?
A. Yes, the Cisco Catalyst 3750 switches can be managed using the Web-based Cisco Cluster Management Suite
(CMS) Software, which uses Cisco Switch Clustering technology. Cisco CMS is Web-based software that is embedded
in Cisco Catalyst 3750, 3550, 2950, 3500 XL, 2900 XL, 2900 LRE XL, and 1900 switches. Through Cisco Switch
Clustering technology, users access Cisco CMS with any standard Web browser to manage up to 16 of these switches
at once, regardless of their geographic proximity with the option of using a single IP address if desired. With the
addition of the Cisco Catalyst 3750 switches, Cisco CMS can now extend beyond routed boundaries for even more
flexibility in managing a Cisco cluster.
Cisco CMS provides an integrated management interface for delivering intelligent services, enabling users to manage
their entire LAN with one robust tool. By bringing the simplicity of traditional LAN switching to intelligent services
such as multilayer switching, QoS, multicast, and security ACLs, Cisco CMS allows administrators to take advantage
of benefits formerly reserved for only the most complex networks. The new Guide Mode in Cisco CMS leads the user
step by step through the configuration of high-end features and provides enhanced online help for context-sensitive
assistance. In addition, a Solution Wizard provides automated configuration of the switch for video streaming or
videoconferencing. Future software will provide Solution Wizards for voice over IP (VoIP), mission-critical
applications, and security.
Cisco CMS supports standards-based connectivity options such as Ethernet, Fast Ethernet, Fast EtherChannel®,
Gigabit Ethernet, and Gigabit EtherChannel connectivity. Because Cisco Switch Clustering technology is not limited
by proprietary stacking modules, stacking cables or interconnection media, Cisco CMS expands the traditional
cluster domain beyond a single wiring closet and lets users mix and match interconnections to meet specific
management, performance, and cost requirements.

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Cisco Catalyst 3750 switches can be configured either as command or member switches in a Cisco switch cluster.
Cisco CMS also allows the network administrator to designate a standby or redundant command switch, which takes
the commander duties should the primary command switch fail. Other important features include the ability to
configure multiple ports and switches simultaneously, as well as perform software updates across the entire cluster
at once. Bandwidth graphs and link reports provide useful diagnostic information and the topology map gives
network administrators a quick view of the network status.
Positioning
Q. When would I deploy a Cisco Catalyst 3750 Series versus a Cisco Catalyst 3550 Series switch?
A. The Cisco Catalyst 3750 switches are designed for deployment in similar topological positions in the network as
the Cisco Catalyst 3550 switches. These positions include in the access layer and network backbone of enterprise
wiring closets and branch office networks. The Cisco Catalyst 3750 switches are ideal for those networks requiring
higher levels of availability, redundancy, and performance, and offer the next level of ease of stack management. The
Cisco Catalyst 3750 also provides a higher performance stack interconnect with Cisco StackWise Technology.
Q. What is the positioning of the Cisco Catalyst 3750 Series switches relative to the Cisco Catalyst 2950 Series
switches?
A. The Cisco Catalyst 3750 switches and the Cisco Catalyst 2950G switches are capable of delivering intelligent
services such as advanced QoS, rate-limiting, security filtering, and multicast management to the network edge. The
Cisco Catalyst 3750 switches are the premium fixed-configuration switches and offer greater product family breadth,
a richer set of enterprise-class features, and a platform that supports dynamic, hardware-based IP routing, and the
next generation of stack management and has a much higher performance stack interconnect.
Q. Can CMS manage the Cisco Catalyst 3750 switches with other desktop switches?
A. All desktop switching platforms including the Cisco Catalyst 3750, 3550, 2950, 2950-LRE, 3500 XL, 2900 XL,
2900 LRE XL, and 1900 can be managed using the Cisco CMS Software.
Q. How is Cisco StackWise technology different from GigaStack?
A. GigaStack is a 1 Gbps stacking mechanism that allows traffic to pass between individual switches. Cisco
StackWise technology is a 32-Gbps stack interconnect that unites all of the switches in a stack into one logical unit
for switching and routing.
Service and Warranty
Q. What is the warranty for the Cisco Catalyst 3750 Series Switches?
A. Cisco Catalyst 3750 switches come with the Cisco Limited Lifetime Hardware Warranty. Ongoing software
updates are available to customers on the Cisco Web site free of charge.
Limited Lifetime Warranty
The hardware warranty available on Cisco Catalyst 3750, 3550, 2950, and 3500 XL is the Limited Lifetime
Hardware Warranty. This warranty automatically comes with the purchase of eligible Cisco Catalyst products, free
of charge. For specific details on the Limited Lifetime Hardware Warranty visit:
http://www.cisco.com/univercd/cc/td/doc/es_inpck/lh2cen__.htm

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Software Updates
In addition to the Limited Lifetime Hardware Warranty, Cisco is offering ongoing Cisco IOS®Software updates on
LAN access switches free of charge for these platforms. For the life of the product, updates within the release and
feature set purchased will be made available to customers through the Software Center at:
http://www.cisco.com/public/sw-center/sw-switching.shtml.
Ongoing software updates will be available for the Cisco Catalyst 3750 Series. Updates are applicable only for
releases that Cisco makes available. This statement supersedes any previous warranty or software statement and is
subject to change without notice.
Q. What types of service and support are available for the Cisco Catalyst 3750 Series switches?
A. A full complement of life-cycle service and support is available for the Cisco Catalyst 3750 Series. From
implementation to operation and optimization, Cisco offers Technical Support Service and Advanced Service
delivered either directly or through one of its best-in-class partners.
Technical Support Service
Technical Support Service is available through SMARTnet®and SMARTnet Onsite. SMARTnet augments the
resources of your operations staff by providing them with access to expertise, both online and on the telephone, and
a range of hardware Advance Replacement options. SMARTnet Onsite complements the hardware Advance
Replacement feature by adding the services of a field engineer, services that can be critical for those locations where
staffing is insufficient or unavailable to perform parts replacement activities. For more information about
SMARTnet, visit:
http://www.cisco.com/warp/public/cc/serv/mkt/sup/ent/snet/.
Advanced Service
Total Implementation Solutions (TIS) offers a full range of implementation solutions including project management,
project engineering, configuration, staging, and rollout coordination, and ensuring correct installation and
deployment. Configuration services now include development and verification of configuration for intelligent
services such as QoS and multicast. For more information about Total Implementation Solutions, visit:
http://www.cisco.com/warp/public/cc/serv/mkt/sup/ent/tis/.
For more information about configuration services for QoS and multicast, contact [e-mail].
Product and Contact Information
Q. Where can I find technical and product specifications and other additional information about the Cisco Catalyst
3750 switches?
A. For product literature including data sheets and product specifications, see the Cisco Catalyst 3750 Web site at:
http://www.cisco.com/go/catalyst3750.
Q. What are the part numbers for the Cisco Catalyst 3750 switches? When does it become orderable?
A. The part number and orderability information for the new Cisco Catalyst 3750 switches is available at:
http://www.cisco.com/go/catalyst3750.

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