- Hewlett-Packard Switch User Manual
Table Of Contents
- HP ProCurve 2520 Switches Management and Configuration Guide
- Front Cover
- Title Page
- Copyright, Notices, & Publication Data
- Contents
- Feature Index
- 1.Getting Started
- 2.Selecting a Management Interface
- 3.Using the Menu Interface
- 4.Using the Command Line Interface (CLI)
- 5.Using the ProCurve Web Browser Interface
- 6.Switch Memory and Configuration
- 7.Interface Access and System Information
- 8.Configuring IP Addressing
- 9.Time Protocols
- 10.Port Status and Configuration
- Contents
- Overview
- Viewing Port Status and Configuring Port Parameters
- Menu: Port Status and Configuration
- CLI: Viewing Port Status and Configuring Port Parameters
- Customizing the Show Interfaces Command
- Viewing Port Utilization Statistics
- Viewing Transceiver Status
- Enabling or Disabling Ports and Configuring Port Mode
- Enabling or Disabling Flow Control
- Configuring a Broadcast Limit on the Switch
- Configuring ProCurve Auto-MDIX
- Web: Viewing Port Status and Configuring Port Parameters
- Using Friendly (Optional) Port Names
- 11.Power Over Ethernet (PoE) Operation
- 12.Port Trunking
- Contents
- Overview
- Port Trunk Features and Operation
- Trunk Configuration Methods
- Menu: Viewing and Configuring a Static Trunk Group
- CLI: Viewing and Configuring Port Trunk Groups
- Web: Viewing Existing Port Trunk Groups
- Trunk Group Operation Using LACP
- Trunk Group Operation Using the “Trunk” Option
- How the Switch Lists Trunk Data
- Outbound Traffic Distribution Across Trunked Links
- 13.Configuring for Network Management Applications
- Contents
- Using SNMP Tools To Manage the Switch
- LLDP (Link-Layer Discovery Protocol)
- Terminology
- General LLDP Operation
- Packet Boundaries in a Network Topology
- Configuration Options
- Options for Reading LLDP Information Collected by the Switch
- LLDP and LLDP-MED Standards Compatibility
- LLDP Operating Rules
- Configuring LLDP Operation
- LLDP-MED (Media-Endpoint-Discovery)
- Displaying Advertisement Data
- LLDP Operating Notes
- LLDP and CDP Data Management
- A.File Transfers
- B.Monitoring and Analyzing Switch Operation
- Contents
- Overview
- Status and Counters Data
- Menu Access To Status and Counters
- General System Information
- Task Monitor—Collecting Processor Data
- Switch Management Address Information
- Port Status
- Viewing Port and Trunk Group Statistics and Flow Control Status
- Viewing the Switch’s MAC Address Tables
- Spanning Tree Protocol (MSTP) Information
- Internet Group Management Protocol (IGMP) Status
- VLAN Information
- Web Browser Interface Status Information
- Interface Monitoring Features
- Locating a Device
- C.Troubleshooting
- Contents
- Overview
- Troubleshooting Approaches
- Browser or Telnet Access Problems
- Unusual Network Activity
- General Problems
- 802.1Q Prioritization Problems
- IGMP-Related Problems
- LACP-Related Problems
- Port-Based Access Control (802.1X)-Related Problems
- QoS-Related Problems
- Radius-Related Problems
- Spanning-Tree Protocol (MSTP) and Fast-Uplink Problems
- SSH-Related Problems
- TACACS-Related Problems
- TimeP, SNTP, or Gateway Problems
- VLAN-Related Problems
- Fan Failure
- Using the Event Log for Troubleshooting Switch Problems
- Debug/Syslog Operation
- Debug/Syslog Messaging
- Debug/Syslog Destination Devices
- Debug/Syslog Configuration Commands
- Configuring Debug/Syslog Operation
- Debug Command
- Logging Command
- Adding a Description for a Syslog Server
- Adding a Priority Description
- Configuring the Severity Level for Event Log Messages Sent to a Syslog Server
- Operating Notes for Debug and Syslog
- Diagnostic Tools
- Viewing Switch Configuration and Operation
- Restoring the Factory-Default Configuration
- Restoring a Flash Image
- DNS Resolver
- D.MAC Address Management
- E.Daylight Savings Time on ProCurve Switches
- F.Power-Saving Features
- Index
- Notices & Publication Data
Troubleshooting
DNS Resolver
DNS Resolver
The Domain Name System (DNS) resolver is designed for use in local network
domains where it enables use of a host name or fully qualified domain name
with DNS-compatible switch CLI commands.
DNS operation supports both IPv4 and IPv6 DNS resolution and multiple,
prioritized DNS servers. (For information on IPv6 DNS resolution, refer to the
latest IPv6 Configuration Guide for your switch.)
Terminology
Domain Suffix — Includes all labels to the right of the unique host name in
a fully qualified domain name assigned to an IP address. For example, in
the fully qualified domain name “device53.evergreen.trees.org”, the
domain suffix is “evergreen.trees.org”, while “device53” is the unique
(host) name assigned to a specific IP address.
Fully Qualified Domain Name — The sequence of labels in a domain name
identifying a specific host (host name) and the domain in which it exists.
For example, if a device with an IP address of 10.10.10.101 has a host name
of device53 and resides in the evergreen.trees.org domain, then the
device’s fully qualified domain name is device53.evergreen.trees.org and
the DNS resolution of this name is 10.10.10.101.
Host Name — The unique, leftmost label in a domain name assigned to a
specific IP address in a DNS server configuration. This enables the server to
distinguish a device using that IP address from other devices in the same
domain. For example, in the evergreen.trees.org domain, if an IPv4 address of
10.10.100.27 is assigned a host name of accounts015 and another IP address
of 10.10.100.33 is assigned a host name of sales021, then the switch configured
with the domain suffix evergreen.trees.org and a DNS server that resolves
addresses in that domain can use the host names to reach the devices with
DNS-compatible commands. For example:
ping accounts015
traceroute accounts015
Basic Operation
■ When the switch is configured with only the IP address of a DNS
server available to the switch, then a DNS-compatible command,
executed with a fully qualified domain name, can reach a device found
in any domain accessible through the configured DNS server.
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