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HP Aruba JL253A User Manual

HP Aruba JL253A
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Continuing from the previous Example: (Figure 91: A completed traceroute enquiry on page 532), executing
traceroute with an insufficient maxttl for the actual hop count produces an output similar to this:
Figure 92: Incomplete traceroute because of low maxttl setting
If a network condition prevents traceroute from reaching the destination
Common reasons for traceroute failing to reach a destination include:
Timeouts (indicated by one asterisk per probe, per hop)
Unreachable hosts
Unreachable networks
Interference from firewalls
Hosts configured to avoid responding
Executing traceroute where the route becomes blocked or otherwise fails results in an output marked by
timeouts for all probes beyond the last detected hop. For example, with a maximum hop count of 7 (maxttl = 7),
where the route becomes blocked or otherwise fails, the output appears similar to this:
Figure 93: Traceroute failing to reach the destination address
Viewing switch configuration and operation
In some troubleshooting scenarios, you may need to view the switch configuration to diagnose a problem. The
complete switch configuration is contained in a file that you can browse from the CLI using the commands
described in this section.
Viewing the startup or running configuration file
Syntax:
write terminal
Displays the running configuration.
Chapter 13 Troubleshooting 533

Table of Contents

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HP Aruba JL253A Specifications

General IconGeneral
Product SeriesAruba 2530
Model NumberJL253A
Product TypeSwitch
Power over Ethernet (PoE)Yes
Power over Ethernet (PoE) Budget370 W
Memory512 MB
Flash Memory256 MB
Jumbo Frame SupportYes
VLAN SupportYes
ManagementWeb GUI, CLI, SNMP
LayerLayer 2
MAC Address Table Size16000 entries
ProcessorARM Cortex A9
Dimensions (W x D x H)440 x 44 mm
Operating Temperature0°C to 45°C
Operating Humidity10% to 90% non-condensing
Power SupplyInternal
Input Voltage100-240 VAC
Ports48 x 10/100/1000

Summary

Time Protocols

General steps for running a time protocol on the switch

Ensures uniform time among interoperating devices for management and troubleshooting by attaching meaningful time data to event and error messages.

SNTP time synchronization

SNTP provides three operating modes: Broadcast mode, DHCP mode, and Unicast mode.

NTP time synchronization

Synchronizes time of day among distributed time servers and clients to correlate events from multiple network devices.

SNTP client authentication

Validates SNTP messages received from NTP or SNTP servers before updating network time, requiring matching authentication keys.

Port Status and Configuration

Viewing port status and configuring port parameters

Guides on checking port mode settings and displaying transceiver information for fixed-configuration devices.

Enabling or disabling ports and configuring port mode (CLI)

Allows configuration of port parameters such as speed-duplex and auto-MDIX.

Uni-directional link detection (UDLD)

Monitors link between switches, blocking ports on both ends if link fails, particularly useful for fiber links and trunks.

Uplink Failure Detection

Monitors link state of ports configured as links-to-monitor (LtM) and disables links-to-disable (LtD) ports upon link loss.

Power Over Ethernet (PoE/PoE+) Operation

PoE operation

Enables/disables PoE, monitors status, configures power thresholds, and specifies port priority for power allocation.

Configuring the PoE port priority

Reconfigures PoE priority levels on ports, prioritizing by port number in ascending order.

PoE/PoE+ allocation using LLDP information

Allows automatic power configuration based on link partner's capabilities via LLDP.

Port Trunking

Trunk configuration methods

Covers dynamic LACP trunks and static trunks, including using keys to control dynamic LACP configuration.

Dynamic LACP trunk

Automatically negotiates trunked links between LACP-configured ports, supporting Active or Passive LACP.

Static trunk

Manually configured static trunks using the Port/Trunk Settings screen or the trunk command.

Port Traffic Controls

Rate-limiting

Operates on a per-port basis to limit bandwidth for inbound or outbound traffic, dropping traffic exceeding the limit.

ICMP rate-limiting

Restricts ICMP traffic to percentage levels to throttle worms or viruses, preserving inbound bandwidth for non-ICMP traffic.

Jumbo frames

Configures maximum transmission unit (MTU) for jumbo frames, allowing inbound frames up to 9220 bytes.

Fault Finder

Helps debug unusual network activity like flapping links or transceivers, or troubleshoot multicast/broadcast storms.

Configuring for Network Management Applications

Using SNMP tools to manage the switch

SNMP client application retrieves device configuration and status, and configures the switch.

SNMPv3 access to the switch

Requires IP address configuration and covers enabling SNMPv3, configuring users, communities, and traps.

LLDP

Standard-based method for switches to advertise themselves to adjacent devices and learn about them.

DHCPv4 server

DHCPv4 configuration commands

Commands for configuring the DHCPv4 server, including pools, options, boot file, default router, and DNS servers.

DHCPv6 server

DHCPv6 snooping and relay

Configures DHCPv6 snooping and Dynamic IPv6 Lockdown (DIPLDv6) through SNMP.

ipv6 source-binding

Adds a DHCPv6 static binding entry into the binding table with infinite lifetime.

Zero Touch Provisioning with AirWave and Central

ZTP with AirWave

Supports ZTP using DHCP servers for on-premise management or Activate for cloud-based management.

DHCP-based ZTP with AirWave

Configures switches for ZTP using DHCP option 43 or 60 for AirWave details.

IPsec for AirWave Connectivity

Supports secure communication between switch and Aruba Mobility Controller for AirWave traffic via IPsec tunnel.

File Transfers

Downloading switch software

Provides instructions for downloading switch software via TFTP, USB, SCP, SFTP, and Xmodem.

Using SCP and SFTP

Enables secure file transfers using SCP and SFTP over an SSH tunnel.

Transferring switch configurations

Covers copying configuration files to/from a switch using TFTP, SFTP, USB, or Xmodem.

Monitoring and Analyzing Switch Operation

Status and counters data

Describes status and counters screens for general switch information, port status, and MAC addresses.

MAC address tables

Provides views and searches for MAC addresses using CLI or menu.

Configuring local mirroring

Guides on configuring mirroring sessions where source and destination are on the same switch.

Troubleshooting

Browser or Telnet access problems

Addresses issues with accessing the WebAgent or Telnetting to the switch console.

Duplicate IP addresses

Identifies and resolves issues where duplicate IP addresses exist in the network.

Addressing ACL problems

Troubleshoots issues where ACLs are configured but not used for filtering IP layer 3 packets.

Job Scheduler

Commands

Details commands for setting schedule jobs, including options for at, delay, enable, disable, and count.

Configuration backup and restore without reboot

Benefits of configuration restore without reboot

Restores configurations without reboot, minimizing network outage and allowing incremental updates.

cfg-restore

Restores configuration from backup files (flash, TFTP, SFTP) without requiring a reboot.

Force configuration restore

Allows forcing a reboot if configuration requires it, applying changes after the reboot.

Virtual Technician

Cisco Discovery Protocol (CDP)

Provides tools for switch diagnoses, including CDP packet statistics and clearing counters.

User diagnostic crash via Front Panel Security (FPS) button

Allows manual initiation of diagnostic reset via the front panel Clear button for reliable diagnostics.

IP Service Level Agreement

Overview

IP SLA collects network performance information in real time, simulating protocol packets for measures.

How IP SLA works

Describes the source-destination interaction for IP SLA tests, including packet exchange and timestamping.

Configuration commands

Provides commands for configuring IP SLA parameters like history size, ICMP echo, UDP echo, and TCP connect.

Dynamic Segmentation

User-Based Tunneling

Allows tunneling client traffic based on user roles to an Aruba controller for policy enforcement.

Port-Based Tunneling

Allows tunneling traffic to a Mobility Controller on a per-port basis for policy enforcement.

Cable Diagnostics

Virtual cable testing

Uses VCT command for GigT transceivers to detect cable faults on 100BASE-TX and 1000BASE-T ports.

Cable Diagnostics

Provides commands to test for cable faults and displays results.

Virtual Switching Framework (VSF)

Overview of VSF

Virtualizes up to eight physical devices into one virtual fabric for high availability and scalability.

VSF domain ID

Uniquely identifies VSF fabrics and prevents interference between them.

VSF configuration

Provides methods for manual and automatic VSF fabric configuration.

Simplifying Wireless and IoT Deployments

Auto configuring Aruba APs

Dynamically detects Aruba APs and applies predefined configurations to connected ports.

Associating a device with a profile

Associates Aruba access point device types with user-defined profiles for automatic configuration.

Network Out-of-Band Management (OOBM)

OOBM Configuration

Commands for configuring OOBM, including enabling/disabling, port speed, and IP address settings.

LACP-MAD Passthrough

Overview

Detection mechanism for IRF stack breakup, helping to detect multiaccess and take corrective action.

LACP-MAD Passthrough commands

Commands for configuring LACP-MAD passthrough on LACP trunks and ports.

Remote Device Deployment (TR-069)

Zero-touch configuration process

Automates device configuration and firmware updates without manual setup.

DHCP-based ZTP with AirWave

Configures switches for ZTP using DHCP option 43 or 60 for AirWave details.

Smart Rate Technology

Show Smart Rate port

Displays port diagnostics on a Smart Rate port.

Rate-Limiting — GMB features when Fast-Connect SmartRate ports are configured

Configures rate-limiting and Guaranteed Minimum Bandwidths for 5Gbps ports.

Speed-duplex

Configures speed and duplex settings for ports, supporting auto-negotiation.

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