Table of Contents

Advertisement

Quick Links

HPE FlexNetwork 5130 HI Switch Series
Installation Guide
Part number: 5998-8420d
Document version: 6W102-20161101

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the JH323A and is the answer not in the manual?

Questions and answers

Summary of Contents for HPE JH323A

  • Page 1 HPE FlexNetwork 5130 HI Switch Series Installation Guide Part number: 5998-8420d Document version: 6W102-20161101...
  • Page 2 © Copyright 2016 Hewlett Packard Enterprise Development LP The information contained herein is subject to change without notice. The only warranties for Hewlett Packard Enterprise products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. Hewlett Packard Enterprise shall not be liable for technical or editorial errors or omissions contained herein.
  • Page 3: Table Of Contents

      Rack-mounting by using front mounting brackets ······················································································ 8   Rack-mounting by using front and rear mounting brackets (HPE 5130 24G PoE+ 4SFP+ 1-slot HI and HPE 5130 48G PoE+ 4SFP+ 1-slot HI) ············································································································ 12   Mounting the switch on a workbench ··············································································································· 15  ...
  • Page 4 Chassis views ·················································································································································· 44   HPE 5130 24G 4SFP+ 1-slot HI ·············································································································· 44   HPE 5130 24G PoE+ 4SFP+ 1-slot HI ····································································································· 45   HPE 5130 48G 4SFP+ 1-slot HI ·············································································································· 46   HPE 5130 48G PoE+ 4SFP+ 1-slot HI ····································································································· 47  ...
  • Page 5: Preparing For Installation

    HPE 5130/5510 10GbE SFP+ 2-port Module LSWM2SP2PM For regulatory identification purposes, the HPE 5130 HI switches are assigned regulatory model numbers (RMNs), which are listed in the following table. These regulatory numbers should not be confused with the marketing name HPE 5130 HI, or the product codes.
  • Page 6: Examining The Installation Site

    • Do not place the switch near water or in a damp environment. Prevent water or moisture from entering the switch chassis. • Do not place the switch on an unstable case or desk. The switch might be severely damaged in case of a fall.
  • Page 7: Emi

    Table 2 Dust concentration limit in the equipment room Substance Concentration limit (particles/m³) ≤ 3 x 10 Dust (no visible dust on the tabletop over three days) NOTE: Dust diameter ≥ 5 μm The equipment room must also meet limits on salts, acids, and sulfides to eliminate corrosion and premature aging of components, as shown in Table Table 3 Harmful gas limits in the equipment room...
  • Page 8: Installation Accessories

    All these installation tools are user supplied. Installation accessories All the installation accessories except M6 screws and floating nuts, the HPE X721 power to port fan tray, PSR150-A/PSR150-A1 (JD362A/JD362B), and the PSR150-D/PSR150-D1 (JD366A/JD366B) DC power supplies are provided with the switch.
  • Page 9 Applicable models code Interface card filler panel 5190-0296 All HPE 5130 HI switches HPE X722 port to power fan tray (already installed on the switch) 5060-0174 All HPE 5130 HI switches HPE X721 power to port fan tray (order as required)
  • Page 10: Installing The Switch

    CAUTION: Keep the tamper-proof seal on a mounting screw on the chassis cover intact, and if you want to open the chassis, contact HPE for permission. Otherwise, HPE shall not be liable for any consequence. Figure 1 Hardware installation flow...
  • Page 11: Installing The Switch In A 19-Inch Rack

    Installing the switch in a 19-inch rack Installation methods Table 5 Installation methods for the HPE 5130 HI switches Installation Installation Chassis Installation requirements methods procedure • HPE 5130 24G Using front The mounting bracket kit can be "Rack-mounting by...
  • Page 12: Mounting Bracket Kits

    Mounting bracket kits Table 6 Mounting bracket kits for the HPE 5130 HI switches HPE 5130 24G 4SFP+ 1-slot HPE 5130 24G PoE+ 4SFP+ 1-slot Mounting bracket kits HPE 5130 48G 4SFP+ 1-slot HPE 5130 48G PoE+ 4SFP+ 1-slot Front mounting bracket...
  • Page 13 Determine the mounting position on the switch for the front mounting brackets. You can install the front mounting brackets at one of the following positions: HPE 5130 24G 4SFP+ 1-slot HI and HPE 5130 48G 4SFP+ 1-slot HI switches—Port side, power supply side, or mid-mounting position.
  • Page 14 Figure 8 Attaching the front mounting bracket to the mid-mounting position Mount the chassis in the rack: a. One person supports the chassis bottom with one hand, holds the front part of the chassis with the other hand, and pushes the chassis into the rack gently b.
  • Page 15 Figure 10 Mounting the switch in the rack (front mounting brackets at the power supply side) Figure 11 Mounting the switch in the rack (front mounting brackets at the mid-mounting position)
  • Page 16: Rack-Mounting By Using Front And Rear Mounting Brackets

    (HPE 5130 24G PoE+ 4SFP+ 1-slot HI and HPE 5130 48G PoE+ 4SFP+ 1-slot HI) This mounting method is applicable only to the HPE 5130 24G PoE+ 4SFP+ 1-slot HI and HPE 5130 48G PoE+ 4SFP+ 1-slot HI switches. You can install the front mounting brackets at the port-side or power-side mounting position as needed.
  • Page 17 Figure 13 Attaching the rear mounting brackets to the rack with the wide flange inside the rack   Figure 14 Attaching the rear mounting brackets to the rack with the wide flange outside the rack Mount the switch chassis in the rack: a.
  • Page 18 b. The other person aligns the oval holes in the front brackets with the mounting holes in the front rack posts, and attaches the front mounting brackets with M6 screws (user supplied) to the front rack posts. Tighten the screws and make sure the front and rear mounting brackets have securely attached the switch to the rack.
  • Page 19: Mounting The Switch On A Workbench

    Mounting the switch on a workbench IMPORTANT: • Ensure good ventilation and 10 cm (3.9 in) of clearance around the chassis for heat dissipation. • Avoid placing heavy objects on the switch. To mount the switch on a workbench: Verify that the workbench is sturdy and reliably grounded. Place the switch with bottom up, and clean the round holes in the chassis bottom with dry cloth.
  • Page 20 (4) Grounding hole (5) Grounding cable Connecting the grounding cable to a grounding strip (for the HPE 5130 24G PoE+ 4SFP+ 1-slot HI and HPE 5130 48G PoE+ 4SFP+ 1-slot HI switches) Remove the hex nut of a grounding post on the grounding strip.
  • Page 21: Grounding The Switch With A Grounding Conductor Buried In The Earth Ground

    (3) Grounding cable (4) Hex nut Connecting the grounding cable to a grounding strip (for the HPE 5130 24G 4SFP+ 1-slot HI and HPE 5130 48G 4SFP+ 1-slot HI switches) Remove the hex nut of a grounding post on the grounding strip.
  • Page 22: Grounding The Switch By Using The Ac Power Cord

    Figure 21 Grounding the switch by burying the grounding conductor into the earth ground (1) Grounding screw (2) Chassis rear panel (3) Grounding cable (4) Earth (5) Joint (6) Grounding conductor Grounding the switch by using the AC power cord If the installation site has no grounding strips or earth ground, you can ground an AC-powered switch through the PE wire of the power cord.
  • Page 23: Installing A Psr150(Jd362A, Jd362B, Jd366A, Or Jd366B) Power Supply

    Figure 22 Installation procedure Figure 23 Removal procedure Turn off the circuit Disconnect the power Remove the power breaker cord supply Installing a PSR150(JD362A, JD362B, JD366A, or JD366B) power supply CAUTION: To prevent damage to the power supply or the connectors on the backplane, insert the power supply gently.
  • Page 24: Removing A Psr150(Jd362A, Jd362B, Jd366A, Or Jd366B) Power Supply

    bottom with the other, and slide the power supply slowly along the guide rails into the slot (see callout 1 in Figure 25). Fasten the captive screws on the power supply with a Phillips screwdriver to secure the power supply in the chassis (see callout 2 in Figure 25).
  • Page 25 Remove the filler panel from the target power supply slot, as shown in Figure Figure 26 Removing the filler panel Unpack the power supply and verify that the power supply model is correct. Put away the packaging box and packaging bag of the power supply for future use. Correctly orient the power supply with the power supply slot (use the letters on the power supply faceplate for orientation), grasp the handle of the power supply with one hand and support its bottom with the other, and slide the power supply slowly along the guide rails into the slot until...
  • Page 26: Removing A Psr720-56A/Psr1110-56A (Jg544A/Jg545A) Power Supply

    Removing a PSR720-56A/PSR1110-56A (JG544A/JG545A) power supply Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded. Disconnect the power cord. Press the latch towards the handle, and pull the power supply along the guide rails until it is part-way out.
  • Page 27: Connecting A Psr150-D/Psr150-D1 (Jd366A/Jd366B) Power Supply

    Connecting a PSR150-D/PSR150-D1 (JD366A/JD366B) power supply WARNING! • HPE DC power cords are required if the –48 VDC power source is used. RPS power cords are required if the RPS power source is used. • The power cord color code scheme in Figure 29 is for illustration only.
  • Page 28: (Jd362B) Power Supply

    Connecting a PSR720-56A (JG544A)/PSR1110-56A (JG545A)/PSR150-A (JD362A)/PSR150-A1 (JD362B) power supply The procedure is similar for connecting a PSR720-56A (JG544A), PSR1110-56A (JG545A), or PSR150-A/PSR150-A1 (JD362A/JD362B) power supply. The following uses the PSR720-56A (JG544A) power supply as an example. To connect a PSR720-56A (JG544A) power supply: Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.
  • Page 29: Installing An Interface Card

    This section uses the LSWM2SP2PM interface card as an example to describe the procedures for installing and removing an interface card. Installing an interface card Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded. Remove the filler panel from the target interface card slot as follows: a.
  • Page 30: Removing An Interface Card

    Figure 32 Installing an interface card Removing an interface card Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded. Use a Phillips screwdriver to completely loosen the captive screw on the interface card. Rotate rightward the ejector lever on the interface card.
  • Page 31 • The power cords are correctly connected. • All the interface cables are cabled indoors. If any cable is routed outdoors, verify that the socket strip with lightning protection and lightning arresters for network ports have been correctly connected.
  • Page 32: Accessing The Switch For The First Time

    Setting up the configuration environment You can access the HPE 5130 HI switch through the serial console port or the mini USB console port. As a best practice, use the serial console port to access the switch. To access the switch through the mini USB console port, you need to prepare the mini USB console cable.
  • Page 33: Connecting The Mini Usb Console Cable

    RJ-45 Signal DB-9 Signal To connect a configuration terminal (for example, a PC) to the switch: Plug the DB-9 female connector of the console cable to the serial port of the PC. Connect the RJ-45 connector to the console port of the switch. NOTE: •...
  • Page 34 Figure 35 Device Driver Installation Wizard Click Continue Anyway if the following dialog box appears. Figure 36 Software Installation Click Finish.
  • Page 35: Setting Terminal Parameters

    Figure 37 Completing the device driver installation wizard Setting terminal parameters To configure and manage the switch through the console port, you must run a terminal emulator program, TeraTermPro or PuTTY, on your PC. You can use the emulator program to connect a network device, a Telnet site, or an SSH site.
  • Page 36 After the startup completes, you can access the CLI to configure the switch. For more information about the configuration commands and CLI, see HPE 5130 HI Switch Series Configuration Guides and HPE 5130 HI Switch Series Command References.
  • Page 37: Setting Up An Irf Fabric

    Setting up an IRF fabric You can use HPE IRF technology to connect and virtualize HPE 5130 HI switches into a large virtual switch called an "IRF fabric" for flattened network topology, and high availability, scalability, and manageability. IRF fabric setup flowchart...
  • Page 38: Planning Irf Fabric Setup

    Distribute the IRF member switches in different racks to implement the ToR access solution for a data center. NOTE: For the maximum number of IRF member devices in an HPE 5130 HI IRF fabric, see the release notes. Identifying the master switch and planning IRF member IDs Determine which switch you want to use as the master for managing all member switches in the IRF fabric.
  • Page 39: Identifying Physical Irf Ports On The Member Switches

    As a best practice to avoid loop topology, first complete IRF configuration and then connect the IRF member switches. The HPE 5130 HI switches can provide 10-GE IRF connections through SFP+ ports, and you can bind several SFP+ ports to an IRF port for increased bandwidth and availability.
  • Page 40: Planning The Cabling Scheme

    For more information about SFP+ DAC cables and SFP+ transceiver modules, see "Appendix C Ports and LEDs." The following subsections describe several HPE recommended IRF connection schemes, and all these schemes use a ring topology. IMPORTANT: In these schemes, all physical IRF ports are located on the same side. If physical IRF ports are on different sides, you must measure the distance between them to select an appropriate cable.
  • Page 41 Figure 41 Connecting the switches in one rack...
  • Page 42: Configuring Basic Irf Settings

    • Execute the display irf configuration command to verify the basic IRF settings. For more information about configuring basic IRF settings, see HPE 5130 HI Switch Series IRF Configuration Guide. Connecting the physical IRF ports As a best practice to avoid loop topology, first complete IRF configuration and then connect the IRF member switches.
  • Page 43: Verifying The Irf Fabric Setup

    To avoid IP address collision and network problems, configure a minimum of one multi-active detection (MAD) mechanism to detect the presence of multiple identical IRF fabrics and handle collisions. For more information about MAD detection, see HPE 5130 HI Switch Series IRF Configuration Guide.
  • Page 44: Maintenance And Troubleshooting

    Symptom The power supply status LEDs are not steady green. For the HPE 5130 24G 4SFP+ 1-slot HI and HPE 5130 48G 4SFP+ 1-slot HI switches, examine the PWR1 or PWR2 LED of the switch to identify power supply failure.
  • Page 45: Removing A Fan Tray

    Removing a fan tray WARNING! • Do not touch any bare conductors or terminals on the fan tray. • Do not place the fan tray in a moist place. Prevent liquid from entering the fan tray. • Do not disassemble faulty fan trays yourself. When the internal wiring or components of a fan tray are faulty, ask maintenance engineers for maintenance.
  • Page 46: Configuration Terminal Display Problems

    Figure 45 Installing a fan tray IMPORTANT: • By default, the switch uses the same air flow direction as the HPE X722 port to power fan tray. • After you install the HPE X721 power to port fan tray, use the fan prefer-direction command to set the switch to use the same air flow direction as the fan tray.
  • Page 47: Garbled Display

    Garbled display Symptom The display on the PC is garbled. Solution To resolve the problem: Verify that the following settings are configured for the terminal: Baud rate—9,600. Data bits—8. Parity—None. Stop bits—1. Flow control—None. If the problem persists, contact HPE Support.
  • Page 48: Appendix A Chassis Views And Technical Specifications

    For more information about installing and removing a power supply, see "Installing/removing a power supply." The HPE 5130 24G 4SFP+ 1-slot HI switch comes with a filler panel in the interface card slot. You can select an interface card for the switch as required. In this figure, an LSWM2SP2PM interface...
  • Page 49: Hpe 5130 24G Poe+ 4Sfp+ 1-Slot Hi

    "Installing/removing a power supply." The HPE 5130 24G PoE+ 4SFP+ 1-slot HI switch comes with a filler panel in the interface card slot. You can select an interface card for the switch as required. In this figure, an LSWM2SP2PM interface card is installed in the interface card slot.
  • Page 50: Hpe 5130 48G 4Sfp+ 1-Slot Hi

    The HPE 5130 48G 4SFP+ 1-slot HI switch comes with a filler panel in the interface card slot. You can select an interface card for the switch as required. In this figure, an LSWM2SP2PM interface card is installed in the interface card slot. For more information about installing and removing an interface card, see "Installing/removing an interface...
  • Page 51: Hpe 5130 48G Poe+ 4Sfp+ 1-Slot Hi

    "Installing/removing a power supply." The HPE 5130 48G PoE+ 4SFP+ 1-slot HI switch comes with a filler panel in the interface card slot. You can select an interface card for the switch as required. In this figure, an LSWM2SP2PM interface card is installed in the interface card slot.
  • Page 52: Technical Specifications

    Technical specifications Table 11 Technical specifications for non-PoE switch models Item HPE 5130 24G 4SFP+ 1-slot HI HPE 5130 48G 4SFP+ 1-slot HI 43.6 × 440 × 360 mm 43.6 × 440 × 360 mm Dimensions (H × W ×...
  • Page 53 Item HPE 5130 24G 4SFP+ 1-slot HI HPE 5130 48G 4SFP+ 1-slot HI Fire resistance UL60950-1, EN60950-1, IEC60950-1, GB4943 compliance Table 12 Technical specifications for PoE switch models HPE 5130 24G PoE+ 4SFP+ HPE 5130 48G PoE+ 4SFP+ 1-slot Item 1-slot HI 43.6 ×...
  • Page 54 Fire resistance UL60950-1, EN60950-1, IEC60950-1, GB4943 compliance The following table describes PoE power capacity for the HPE 5130 24G PoE+ 4SFP+ 1-slot HI and HPE 5130 48G PoE+ 4SFP+ 1-slot HI switches: HPE 5130 24G PoE+ 4SFP+ HPE 5130 48G PoE+ 4SFP+ 1-slot HI...
  • Page 55: Appendix B Frus And Compatibility Matrixes

    You can install one power supply, or two power supplies for redundancy on the HPE 5130 24G 4SFP+ 1-slot HI and HPE 5130 48G 4SFP+ 1-slot HI switches. These switches support mix of an AC power supply and a DC power supply.
  • Page 56: Hot Swappable Interface Cards

    Power supply Specifications Reference • Rated input voltage range: –48 VDC to –60 VDC PSR150-D/PSR150-D1 HPE PSR150-A & PSR150-D • Max input voltage range: –36 VDC to (JD366A/JD366B) Power Supplies User Guide –72 VDC • Max output power: 150 W •...
  • Page 57 If the device connects to one distribution frame, connect port 1 on the device to port 1 on the distribution frame and port 2 on the device to port 3 on the distribution frame. If the device connects to two distribution frames, connect port 1 on the device to port 1 on distribution frame 1 and port 2 on the device to port 1 on distribution frame 2.
  • Page 58: Appendix C Ports And Leds

    NOTE: USB devices from different vendors vary in compatibilities and drivers. HPE does not guarantee the correct operation of USB devices from all vendors on the switch. If a USB device fails to operate on...
  • Page 59: 10/100/1000Base-T Autosensing Ethernet Port

    (nm) (µm) (MHz × km) n distance 550 m (1804.46 ft) Multi-mode, 50/125 500 m HPE X120 (1640.42 ft) 1G SFP LC JD118B 275 m (902.23 Transceiver Multi-mode, 62.5/125 220 m (721.78 Single-mode, 10 km (6.21...
  • Page 60 (nm) (µm) (MHz × km) n distance LH40 1550nm Transceiver HPE X125 1G SFP LC Single-mode, 70 km (43.50 JD063B 1550 LH70 9/125 miles) Transceiver HPE X120 1G SFP LC Single-mode, 100 km (62.14...
  • Page 61 Transceiver Table 18 SFP+ DAC cables available for the SFP+ ports Product code HPE description Max transmission distance HPE X240 10G SFP+ SFP+ 0.65m DA JD095B 0.65 m (2.13 ft) Cable HPE X240 10G SFP+ SFP+ 1.2m DA JD096B 1.2 m (3.94 ft)
  • Page 62: Leds

    NOTE: • The fixed SFP+ ports on the switch do not support the HPE X130 10G SFP+ LC LRM Transceiver, HPE X130 10G SFP+ LC LH 80km Transceiver, and HPE X130 10G SFP+ LC ER 40km Transceiver. • To guarantee the functionality of the SFP+ ports, use only HPE SFP/SFP+ transceiver modules and SFP+ DAC cables.
  • Page 63: Led For The Port Led Mode (Mode)

    PoE output power on the port. Flashing green (1 Hz) (PoE mode, available only for HPE 5130 24G PoE+ 4SFP+ 1-slot HI and HPE The port is experiencing a PoE Steady yellow 5130 48G PoE+ 4SFP+ 1-slot HI switches) failure.
  • Page 64: Sfp+ Port Led

    Port mode LED (Mode) status Port LED status Description The port status LED indicates the IRF member ID of the Flashing yellow (IRF mode) Steady green switch. For example, if the ports 1 to 5 are steady green, the IRF member ID of the switch is 5.
  • Page 65: Fan Tray Status Led On The Fan Tray

    LED mark Status Description has failed. The interface card slot is empty. Fan tray status LED on the fan tray Each fan tray has a fan tray status LED to indicate its operating status. Table 26 Fan tray status LED description Status Description Steady yellow...
  • Page 66: Appendix D Cooling System

    Figure Figure 55 Airflow through the HPE 5130 48G 4SFP+ 1-slot HI switch IMPORTANT: The chassis and the power supplies use separate air aisles. Make sure both aisles are not blocked.
  • Page 67: Document Conventions And Icons

    Document conventions and icons Conventions This section describes the conventions used in the documentation. Port numbering in examples The port numbers in this document are for illustration only and might be unavailable on your device. Command conventions Convention Description Bold text represents commands and keywords that you enter literally as shown. Boldface Italic text represents arguments that you replace with actual values.
  • Page 68: Network Topology Icons

    Convention Description An alert that provides helpful information. TIP: Network topology icons Convention Description Represents a generic network device, such as a router, switch, or firewall. Represents a routing-capable device, such as a router or Layer 3 switch. Represents a generic switch, such as a Layer 2 or Layer 3 switch, or a router that supports Layer 2 forwarding and other Layer 2 features.
  • Page 69: Support And Other Resources

    Support and other resources Accessing Hewlett Packard Enterprise Support • For live assistance, go to the Contact Hewlett Packard Enterprise Worldwide website: www.hpe.com/assistance • To access documentation and support services, go to the Hewlett Packard Enterprise Support Center website: www.hpe.com/support/hpesc Information to collect •...
  • Page 70: Websites

    For more information and device support details, go to the following website: www.hpe.com/info/insightremotesupport/docs Documentation feedback Hewlett Packard Enterprise is committed to providing documentation that meets your needs. To help us improve the documentation, send any errors, suggestions, or comments to Documentation Feedback (docsfeedback@hpe.com). When submitting your feedback, include the document title,...
  • Page 71 part number, edition, and publication date located on the front cover of the document. For online help content, include the product name, product version, help edition, and publication date located on the legal notices page.
  • Page 72: Index

    Index planning IRF connections, Numerics power cord, 10/100/1000 Base-T autosensing Ethernet PSR150-D1(JD366B), port, PSR720-56A(JG544A)/PSR1110-56A(JG545A)/ port LED, PSR150-A1(JD362B), 19-inch rack USB mini console cable, mounting bracket kit, console switch installation, connecting cable, connecting USB mini cable, port technical specifications, AC power supply grounding switch through AC power cord, access data bits (parameter),...
  • Page 73 electromagnetic interference. See EMI prevention grounding switch, EMI prevention, grounding switch through AC power cord, emulation (parameter), grounding switch with a grounding conductor buried in the earth ground, environment grounding switch with grounding strip, examining installation site, interface card installation, 24, site cleanliness, interface card port status LED, site dust concentration,...
  • Page 74 power supply, system status, PSR150 (JD362A, JD362B, JD366A, or technical specifications, JD366B) power supply, PSR720-56A/PSR1110-56A management Ethernet (JG544A/JG545A) power supply, port, site cleanliness, port LED, site humidity, master switch site temperature, configuring IRF basic settings, switch, 1, IRF fabric, switch in 19-inch rack, member tools, configuring IRF member switch basic settings,...
  • Page 75 connecting removing PSR720-56A/PSR1110-56A PSR720-56A(JG544A)/PSR1110-56A(JG545 (JG544A/JG545A) power supply, A)/PSR150-A1(JD362B), setting up IRF fabric, failure (troubleshooting), troubleshooting fan failure, grounding switch through AC power cord, troubleshooting garbled display, input status LED, troubleshooting no display, installation, troubleshooting power supply failure, output status LED, PSR150 (JD362A, JD362B, JD366A, or JD366B) removal, power supply...
  • Page 76 switch configuration environment, 10/100/1000 Base-T autosensing Ethernet port, terminal parameters, 10/100/1000 Base-T autosensing Ethernet port SFP+ LED, port, console port, port LED, fan tray status LED, site interface card, cleanliness, interface card port status LED, dust concentration, interface card status LED, examining installation site, LED, gas saturation,...

Table of Contents