Table Of Contents
Switch Installation
Preparing for Installation
Safety Warnings
Installation Guidelines
Tools and Equipment
Verifying Switch Operation
Powering Off the Switch
Planning a Switch Data Stack
Switch Stacking and Power Stacking Guidelines
Data Stack Cabling Configurations
Data Stack Bandwidth and Partitioning Examples
Power On Sequence for Switch Data Stacks
Planning a StackPower Stack
StackPower Stacking Guidelines
StackPower Cabling Configurations
StackPower Partitioning Examples
Installing the Switch
Rack-Mounting
Attaching the Rack-Mount Brackets
Mounting the Switch in a Rack
Table- or Shelf-Mounting
After Installing the Switch
Connecting to the StackWise Ports
Connecting to the StackPower Ports
Installing a Network Module in the Switch
Installing and Removing SFP and SFP+ Modules
Connecting Devices to the Ethernet Ports
10/100/1000 Ethernet Port Connections
PoE+ Port Connections
Where to Go Next
Switch Installation
This chapter describes how to install and connect a Catalyst 3850 switch. It also includes planning and cabling considerations for stacking switches. Read the topics and perform the procedures in this order:
•
Preparing for Installation
•Planning a Switch Data Stack
•Planning a StackPower Stack
•Installing the Switch
•Connecting to the StackWise Ports
•Installing a Network Module in the Switch
•Connecting Devices to the Ethernet Ports
•Where to Go Next
For initial switch setup, how to assign the switch IP address, and for powering information, see the switch getting started guide on Cisco.com.
Preparing for Installation
•Safety Warnings
•Installation Guidelines
•Tools and Equipment
Safety Warnings
This section includes the basic installation caution and warning statements. Translations of the warning statements appear in the Regulatory Compliance and Safety Information for the Catalyst 3850 Switch document available at Cisco.com. Read this section before you start the installation procedure.
 |
Warning Before working on equipment that is connected to power lines, remove jewelry (including rings, necklaces, and watches). Metal objects will heat up when connected to power and ground and can cause serious burns or weld the metal object to the terminals. Statement 43
|
|
Warning Do not stack the chassis on any other equipment. If the chassis falls, it can cause severe bodily injury and equipment damage. Statement 48
|
|
Warning Ethernet cables must be shielded when used in a central office environment. Statement 171
|
|
Warning Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is disrupted. After power is restored, you might have to reset or reconfigure equipment to regain access to VoIP and the emergency calling service. In the USA, this emergency number is 911. You need to be aware of the emergency number in your country. Statement 361
|
|
Warning If a Cisco external power system is not connected to the switch, install the provided connector cover on the back of the switch. Statement 386
|
|
Warning Do not work on the system or connect or disconnect cables during periods of lightning activity. Statement 1001
|
|
Warning Read the installation instructions before connecting the system to the power source. Statement 1004
|
|
Warning This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. Statement 1017
|
|
Warning The plug-socket combination must be accessible at all times, because it serves as the main disconnecting device. Statement 1019
|
|
Warning Use copper conductors only. Statement 1025
|
|
Warning This unit might have more than one power supply connection. All connections must be removed to de-energize the unit. Statement 1028
|
|
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030
|
|
Warning Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040
|
|
Warning For connections outside the building where the equipment is installed, the following ports must be connected through an approved network termination unit with integral circuit protection: 10/100/1000 Ethernet. Statement 1044
|
|
Warning To prevent the system from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature of:
113°F (45°C) Statement 1047
|
|
Warning Installation of the equipment must comply with local and national electrical codes. Statement 1074
|
|
Warning To prevent airflow restriction, allow clearance around the ventilation openings to be at least:
3 in. (7.6 cm) Statement 1076
|
Note The grounding architecture of this product is DC-isolated (DC-I).
Installation Guidelines
Before installing the switch, verify that these guidelines are met:
•Clearance to front and rear panels requires that
–Front-panel indicators can be easily read.
–Clearance is at least 4.4 in. (11.1 cm) from switch rear panel.
–Access to ports is sufficient for unrestricted cabling.
–AC power cord can reach from the AC power outlet to the connector on the switch rear panel.
–The SFP or SFP+ module minimum bend radius and connector length is met. See the SFP or SFP+ module documentation for more information.
•For switches with the optional 1100-W power-supply module (PWR-C1-1100WAC=), first rack-mount the switch before installing the power-supply module.
•Make sure power-supply modules and fan modules are securely inserted in the chassis before moving the switch.
•When connecting or disconnecting the power cord on a switch that is installed above or below a 1100-W power supply-equipped switch, you might need to remove the module from the switch to access the power cord.
•Cabling is away from sources of electrical noise, such as radios, power lines, and fluorescent lighting fixtures. Make sure that the cabling is safely away from other devices that might damage the cables.
•For copper connections on Ethernet ports, cable lengths from the switch to connected devices can be up to 328 feet (100 meters).
•For cable requirements for SFP+ module connections, see the "Cable and Adapter Specifications" section. Each port must match the wave-length specifications on the other end of the cable, and the cable must not exceed the minimum cable length.
•Operating environment is within the ranges listed in "Technical Specifications."
•Airflow around the switch and through the vents is unrestricted.
•Temperature around the unit does not exceed 113°F (45°C). If the switch is installed in a closed or multirack assembly, the temperature around it might be greater than normal room temperature.
•Cisco Ethernet switches are equipped with cooling mechanisms, such as fans and blowers. However, these fans and blowers can draw dust and other particles, causing contaminant buildup inside the chassis, which can result in system malfunction. You must install this equipment in an environment as free from dust and foreign conductive material (such as metal flakes from construction activities) as is possible.
Tools and Equipment
You need to supply a number-2 Phillips screwdriver to rack-mount the switch, to install network modules, and to install StackPower cables.
Verifying Switch Operation
Before you install the switch in a rack, or on a table or shelf, you should power on the switch and verify that the switch passes POST. See the "Running Express Setup" section in the getting started guide for the steps required to connect a PC to the switch and to run Express Setup.
Powering Off the Switch
After a successful POST, disconnect the power cord from the switch. Install the switch in a rack, on a table, or on a shelf as described in the Chapter 2 "Switch Installation," section.
Planning a Switch Data Stack
Catalyst 3850 switches can share bandwidth by using data stacking.
•Switch Stacking and Power Stacking Guidelines
•Data Stack Cabling Configurations
•Data Stack Bandwidth and Partitioning Examples
•Installing the Switch
Switch Stacking and Power Stacking Guidelines
For general concepts and management procedures for switch stacks, see the switch software configuration guide on Cisco.com.
Before connecting the switches in a stack, keep in mind these stacking guidelines:
•Size of the switch and any optional power-supply module. The 1100-W power-supply module is longer than the other modules. Stacking switches with the same power-supply modules together makes it easier to cable the switches. For switch dimensions, see "Technical Specifications."
•Length of cable. Depending on the configurations that you have, you might need different-sized cables. If you do not specify the length of the StackWise cable, the 0.5-meter cable is supplied. If you need the 1-meter cable or the 3-meter cable, you can order it from your Cisco supplier. For cable part numbers, see the "StackWise Ports" section. The "Data Stack Cabling Configurations" section provides examples of recommended configurations.
•For rack-mounted switch stacks that are members of a StackPower stack as well as a data stack, see the "Planning a StackPower Stack" section.
•You can create data stacks with up to four switches in a stack.
Data Stack Cabling Configurations
Figure 2-1 is an example of a recommended configuration that uses the supplied 0.5-meter StackWise cable. In this example, the switches are stacked in a vertical rack or on a table. This configuration provides redundant connections.
The configuration example (Figure 2-1) uses the supplied 0.5-meter StackWise cable. The example shows the full-ring configuration that provides redundant connections.
Figure 2-1 Data Stacking the Catalyst 3850 Switches in a Rack or on a Table Using the 0.5-meter StackWise Cables
Figure 2-2 shows a recommended configuration when the switches are mounted side-by-side. Use the 1-meter and the 3-meter StackWise cables to connect the switches. This configuration provides redundant connections.
Figure 2-2 Data Stacking up to Four Switches in a Side-by-Side Mounting
Data Stack Bandwidth and Partitioning Examples
This section provides examples of data stack bandwidth and possible data stack partitioning.
Figure 2-3 shows a data stack of Catalyst 3850 switches that provides full bandwidth and redundant StackWise cable connections.
Figure 2-3 Example of a Data Stack with Full Bandwidth Connections
Figure 2-4 shows an example of a stack of Catalyst 3850 switches with incomplete StackWise cabling connections. This stack provides only half bandwidth and does not have redundant connections.
Figure 2-4 Example of a Data Stack with Half Bandwidth Connections
Figure 2-5 and Figure 2-6 show data stacks of Catalyst 3850 switches with failover conditions. In Figure 2-5, the StackWise cable is bad in link 2. Therefore, this stack provides only half bandwidth and does not have redundant connections. In Figure 2-6, link 2 is bad. Therefore, this stack partitions into two stacks, and the top and bottom switches become the active switch in the stack. If the bottom switch is a member (not active or standby switch), it reloads.
Figure 2-5 Example of a Data Stack with a Failover Condition
Figure 2-6 Example of a Partitioned Data Stack with a Failover Condition
Power On Sequence for Switch Data Stacks
Consider these guidelines before you power on the switches in a stack:
•The sequence in which the switches are first powered on might affect the switch that becomes the active switch and the standby switch.
•There are two ways to elect an active switch:
–If you want a particular switch to become the active switch, configure it with the highest priority. Among switches with same priority, the switch with the lowest MAC address becomes the active switch.
–If you want a particular switch to become the active switch, power on that switch first. This switch remains the active switch until a reelection is required. After 2 minutes, power on the other switches in the stack. If you have no preference as to which switch becomes the active switch, power on all the switches in the stack within 1 minute. These switches participate in the active switch election. Switches powered on after 2 minutes do not participate in the election.
If changes are made to the stack without powering down the switches, the following results can occur:
•If two operating partial ring stacks are connected together using a stack cable, a stack merge can take place. This situation reloads the whole stack (all switches in the stack).
•If some switches in the stack are completely separated from the stack, a stack split can take occur.
•A stack split can occur on a full ring stack if:
–More than one running switch is removed without powering down.
–More than one stack cable is removed without powering down.
•A stack split can occur in a partial ring stack if:
–A switch is removed without powering down.
–A stack cable is removed without powering down.
•In a split stack, depending on where the active and standby switches are located, either two stacks might be formed (with the standby taking over as the new active switch in the newly formed stack) or all the members in the newly formed stack might reload.
Note These results depend on how the switches are connected. You can remove two or more switches from the stack without splitting the stack.
For conditions that can cause a stack reelection or to manually elect the active switch, see the stacking software configuration guide on Cisco.com at this URL:
http://www.cisco.com/go/cat3850_docs
Planning a StackPower Stack
Catalyst 3850 switches can share power by using the StackPower feature.
•StackPower Stacking Guidelines
•StackPower Cabling Configurations
StackPower Stacking Guidelines
You can configure a StackPower stack for either power sharing or redundancy. In power-sharing mode, the power of all the power supplies in the stack is aggregated and distributed among the stack members.
In redundant mode, when the total power budget of the stack is calculated, the wattage of the largest power supply is not included. That power is held in reserve and used to maintain power to switches and attached devices when one power supply fails. Following the failure of a power supply, the StackPower mode becomes power sharing.
Note Power-sharing mode is the recommended configuration for Catalyst 3850 switches.
For general concepts and management procedures for switch power stacks, see the software stacking configuration guide on Cisco.com.
Before connecting the switches in a power stack, keep in mind these guidelines:
•Size of the switch and any optional power supply module. The 1100-W power-supply module is 1.5 inches (3.81 cm) longer than the other modules, and with the attached cable retention clip, it extends 3 inches (7.62 cm) from the switch chassis. Stacking switches with the same power-supply modules together makes it easier to cable the switches. For switch dimensions, see "Technical Specifications."
•Length of cable. Depending on the configurations that you have, you might need different-sized cables. If you do not specify the length of the StackPower cable, the 0.3 meter cable is supplied. If you need the 1.5 meter cable, you can order it from your Cisco supplier. For cable part numbers, see the "StackPower Connector" section. The "StackPower Cabling Configurations" section provides examples of recommended configurations.
•For rack-mounted switch stacks that are members of a data stack and a StackPower stack, see the "Switch Stacking and Power Stacking Guidelines" section.
StackPower Cabling Configurations
This section describes the recommended cabling configurations for a StackPower stack. The cable in Figure 2-7 connects a Catalyst 3850 switch to another Catalyst 3850 switch in a power stack.
Note All cable connectors are keyed and color-coded, as are the connections on the switches (See Figure 1-7).
The cable is available in two lengths.
Table 2-1 StackPower Cables
Part Number
|
Cable Type
|
Length
|
CAB-SPWR-30CM
|
StackPower cable
|
0.3 meter
|
CAB-SPWR-150CM
|
StackPower cable
|
1.5 meter
|
Figure 2-7 StackPower Cable for Use with Catalyst 3850 Switches
Figure 2-8 shows a ring configuration using both of the supplied 0.3-meter StackPower cables and one 1.5-meter cable. In these examples, the switches are stacked in a vertical rack or on a table.
Figure 2-8 StackPower Ring Topology
StackPower Partitioning Examples
Figure 2-9 and Figure 2-10 show StackPower stacks of Catalyst 3850 switches with failover conditions. In Figure 2-9, the StackPower cable 2 is faulty. Therefore, this stack does not provide redundancy.
Figure 2-9 Example of a StackPower Stack with a Failover Condition
In Figure 2-10, StackPower port B on the center switch has failed and this stack partitions into two stacks. The top two switches share power, and the bottom switch is now a separate stack.
Figure 2-10 Example of a Partitioned StackPower Stack with a Failover Condition
Installing the Switch
•Rack-Mounting
•Table- or Shelf-Mounting
•After Installing the Switch
The illustrations shown in this section show the Catalyst 3850-48 PoE+ switch as an example. You can install other Catalyst 3850 switches following the same procedures.
Rack-Mounting
To install the switch in a 19-inch rack, follow the instructions described in this section.
|
Warning
|
|
To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions to ensure that the system remains stable. The following guidelines are provided to ensure your safety:
•This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
•When mounting this unit in a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.
•If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the unit in the rack. Statement 1006
|
The 19-inch brackets are included with the switch. Installing the switch in other rack types requires an optional bracket kit not included with the switch. Figure 2-11 shows the mounting brackets and part numbers.
Figure 2-11 Rack-Mounting Brackets
1
|
19-inch brackets (C3850-RACK-KIT=)
|
4
|
23-inch brackets (C3850-RACK-KIT=)
|
2
|
Extension rails and brackets for four-point mounting, includes 19-inch brackets. (C3850-4PT-KIT=)
|
5
|
24-inch brackets (C3850-RACK-KIT=)
|
3
|
ETSI brackets (C3850-RACK-KIT=)
|
|
|
Attaching the Rack-Mount Brackets
To install the switch in a rack, use four Phillips flat-head screws to attach the long side of the brackets to the switch for the front- or rear-mounting positions (Figure 2-12). Use four screws to attach the brackets for the front-mounting position.
Figure 2-12 Attaching Brackets for 19-inch Racks
1
|
Rear-mounting position
|
2
|
Number-8 Phillips flat-head screws
|
3
|
Front-mounting position
|
Mounting the Switch in a Rack
After the brackets are attached to the switch, use the supplied Phillips machine screws to attach the brackets to the rack (Figure 2-14). Use the black Phillips machine screw to attach the cable guide to the left or right bracket.
When you complete the switch installation, see the "After Installing the Switch" section for more information switch configuration.
Figure 2-13 Mounting the Switch in a Rack
1
|
Phillips machine screw, black
|
3
|
Front-mounting position
|
2
|
Cable guide
|
4
|
Number-12 or number-10 Phillips machine screws
|
When you complete the switch installation, see the "After Installing the Switch" section for more information about switch configuration.
Table- or Shelf-Mounting
To install the switch on a table or shelf, locate the adhesive strip with the rubber feet in the mounting-kit envelope. Attach the four rubber feet to the recessed areas on the bottom of the chassis (see Figure 2-14).
Figure 2-14 Attaching the Adhesive Pads for Table- or Shelf-Mounting
When you complete the switch installation, see the "After Installing the Switch" section for more information switch configuration.
After Installing the Switch
After the switch is installed, you might need to:
•Configure the switch by running Express Setup to enter the initial switch configuration. For instructions, see the switch getting started guide that shipped with the switch and also on Cisco.com.
•Use the CLI setup program to enter the initial switch configuration. See "Configuring the Switch with the CLI-Based Setup Program."
•Connect to the front-panel ports. See the "Installing a Network Module in the Switch" section and the "Connecting Devices to the Ethernet Ports" section.
Connecting to the StackWise Ports
Before connecting the StackWise cables, review the "Planning a Switch Data Stack" section. Always use a Cisco-approved StackWise cable to connect the switches.
Step 1 Remove the dust covers from the StackWise cables and StackWise ports, and store them for future use.
Step 2 Connect the cable to the StackWise port on the switch rear panel. Align the connector and connect the StackWise cable to the StackWise port on the switch rear panel and finger-tighten the screws (clockwise direction). Make sure the Cisco logo is on the top side of the connector as shown in Figure 2-15.
Step 3 Connect the other end of the cable to the port on the other switch and finger-tighten the screws. Avoid overtightening the screws.
Figure 2-15 Connecting the StackWise Cable in a StackWise Port
1
|
Cisco logo
|
3
|
Connector screw
|
2
|
Connector screw
|
|
|
Caution Removing and installing the StackWise cable can shorten its useful life. Do not remove and insert the cable more often than is absolutely necessary (installing and removing it up to 200 times is supported).
When you need to remove the StackWise cable from the connector, make sure to fully unscrew the correct screws. When the connectors are not being used, replace the dust covers.
Connecting to the StackPower Ports
Before connecting the StackPower cables, review the "Planning a StackPower Stack" section. Always use a Cisco-approved StackPower cable to connect the switches. To prevent misconfiguration, the StackPower ports on the switch are keyed and have colored stripes that match the keying and stripes on the StackPower cable connectors.
Follow these steps to connect the StackPower cable to the StackPower ports:
Step 1 Remove the dust covers from the StackPower cable connectors.
Step 2 Connect the end of the cable with a green stripe to either StackPower connector on the first switch. Align the connector correctly, and connect the cable to a StackPower port on the switch rear panel. (Figure 2-16).
Step 3 Connect the end of the cable with the yellow stripe to another Catalyst 3850 switch (to configure StackPower power sharing).
Step 4 Hand-tighten the captive screws to secure the StackPower connectors in place.
Figure 2-16 Connecting the StackPower Cable to a StackPower Port
Caution Removing and installing the StackPower cable can shorten its useful life. Do not remove and insert the cable more often than necessary.
Installing a Network Module in the Switch
See these sections for information on network modules:
•Installing a Network Module in the Switch
•Removing a Network Module
Installing and Removing SFP and SFP+ Modules
See these sections for information on SFPs and SFP+:
•Installing SFP and SFP+ Modules
•Removing SFP or SFP+ Modules
Connecting Devices to the Ethernet Ports
•10/100/1000 Ethernet Port Connections
•PoE+ Port Connections
Caution Category 5e and Category 6 cables can store high levels of static electricity. Always ground the cables to a suitable and safe earth ground before connecting them to the switch or other devices.
10/100/1000 Ethernet Port Connections
The 10/100/1000 Ethernet ports use RJ-45 connectors with Ethernet pinouts. The maximum cable length is 328 feet (100 meters). The 100BASE-TX and 1000BASE-T traffic requires Category 5, Category 5e, or Category 6 UTP cable. The 10BASE-T traffic can use Category 3 or Category 4 cable.
The autonegotiation feature is enabled by default on the switch. At this setting, the switch ports configure themselves to operate at the speed of attached device. If the attached device does not support autonegotiation, you can explicitly set the switch port speed and duplex parameters. To maximize performance, either let the ports autonegotiate both speed and duplex, or set the port speed and duplex parameters on both ends of the connection.
For simplified cabling, the automatic medium-dependent interface crossover (auto-MDIX) feature is enabled by default on the switch. With auto-MDIX enabled, the switch detects the required cable type for copper Ethernet connections and configures the interface accordingly. Therefore, you can use either a crossover or a straight-through cable for connections to a switch 10/100/1000 Ethernet port regardless of the type of device on the other end of the connection.
See the switch software configuration guide or the switch command reference on Cisco.com for more information about enabling or disabling autonegotiation and auto-MDIX.
If auto-MDIX is disabled, use the guidelines in Table 2-2 to select the correct cable for connecting the switch 10/100/1000 Ethernet ports to other devices. See the "Cable and Adapter Specifications" section for cable-pinout descriptions.
Table 2-2 Recommended Ethernet Cables (When Auto-MDIX is Disabled)
Device
|
|
Straight-Through Cable1
|
Switch to switch
|
Yes
|
No
|
Switch to hub
|
Yes
|
No
|
Switch to computer or server
|
No
|
Yes
|
Switch to router
|
No
|
Yes
|
Switch to IP phone
|
No
|
Yes
|
PoE+ Port Connections
The 10/100/1000 PoE+ ports have the same autonegotiation settings and cabling requirements that are described in the "10/100/1000 Ethernet Port Connections" section. These ports can provide PoE or PoE+ inline power.
PoE inline power supports devices compliant with the IEEE 802.3af standard, as well as prestandard Cisco IP Phones and Cisco Aironet Access Points. Each port can deliver up to 15.4 W of PoE.
PoE+ inline power supports devices compliant with the IEEE 802.3at standard, by delivering up to 30 W of PoE+ power per port to all switch ports.
See Table 1-17 for the power supply modules required to support PoE and PoE+ on 24- and 48-port switches.
For more information about the required power-supply module and the PoE specifications, see the "Power Supply Modules" section and "Technical Specifications."
Note Many legacy powered devices, including older Cisco IP phones and access points that do not fully support IEEE 802.3af, might not support PoE when connected to the switches by a crossover cable.
Caution PoE faults are caused when noncompliant cabling or powered devices are connected to a PoE port. Use only standard-compliant cabling to connect Cisco prestandard IP Phones, wireless access points, or IEEE 802.3af-compliant devices to PoE ports. A cable or device that causes a PoE fault must be removed from the network.
|
Warning Voice over IP (VoIP) service and the emergency calling service do not function if power fails or is disrupted. After power is restored, you might have to reset or reconfigure equipment to regain access to VoIP and the emergency calling service. In the USA, this emergency number is 911. You need to be aware of the emergency number in your country. Statement 361
|
|
Warning Voltages that present a shock hazard may exist on Power over Ethernet (PoE) circuits if interconnections are made using uninsulated exposed metal contacts, conductors, or terminals. Avoid using such interconnection methods, unless the exposed metal parts are located within a restricted access location and users and service people who are authorized within the restricted access location are made aware of the hazard. A restricted access area can be accessed only through the use of a special tool, lock and key or other means of security. Statement 1072
|
Where to Go Next
If the default configuration is satisfactory, the switch does not need further configuration. You can use any of these management options to change the default configuration:
•Start the Network Assistant application, which is described in the Getting Started with Cisco Network Assistant guide. Through this GUI, you can configure and monitor a switch cluster or an individual switch.
•Use the CLI to configure the switch as a member of a cluster or as an individual switch from the console. See the switch command reference on Cisco.com for information on using the CLI with the switch.
•Use the Cisco Prime Infrastructure application.
Feedback
