- play_arrow Overview
- play_arrow Overview
- J-Web User Interface for EX Series Switches Overview
- J-Web Interface—Application Package
- Understanding J-Web User Interface Sessions
- Dashboard for EX Series Switches
- Understanding J-Web Configuration Tools
- Understand Alarm Types and Severity Levels on EX Series Switches
- Using the Commit Options to Commit Configuration Changes (J-Web Procedure)
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- play_arrow Configuration
- play_arrow Starting J-Web
- play_arrow J-Web Configuration Tools
- play_arrow System Basics Configuration
- Connecting and Configuring an EX Series Switch (J-Web Procedure)
- Configuring Date and Time for the EX Series Switch (J-Web Procedure)
- Configuring System Identity for an EX Series Switch (J-Web Procedure)
- Configuring Management Access for the EX Series Switch (J-Web Procedure)
- Generating SSL Certificates to Be Used for Secure Web Access (EX Series Switch)
- Rebooting or Halting the EX Series Switch (J-Web Procedure)
- play_arrow Class of Service Configuration
- Defining CoS Drop Profiles (J-Web Procedure)
- Defining CoS Classifiers (J-Web Procedure)
- Defining CoS Code-Point Aliases (J-Web Procedure)
- Assigning CoS Components to Interfaces (J-Web Procedure)
- Defining CoS Forwarding Classes (J-Web Procedure)
- Defining CoS Rewrite Rules (J-Web Procedure)
- Defining CoS Schedulers (J-Web Procedure)
- Defining CoS Scheduler Maps (J-Web Procedure)
- play_arrow Security and Management Configuration
- play_arrow Routing Policies and Packet Filtering Configuration
- play_arrow Ethernet Switching Configuration
- play_arrow Interfaces
- play_arrow Configuring Services
- play_arrow Configuring Layer 3 Protocols
- play_arrow Configuring Real-Time Performance Monitoring
- play_arrow Software Installation and Upgrades
- play_arrow Configuration, Files, Users, Licenses, and Product Registration
- Managing Configuration Files Through the Configuration History (J-Web Procedure)
- Setting or Deleting the Rescue Configuration (J-Web Procedure)
- Uploading a Configuration File (J-Web Procedure)
- Managing Log, Temporary, and Crash Files on the Switch (J-Web Procedure)
- Managing Users (J-Web Procedure)
- Managing Licenses for the EX Series Switch (J-Web Procedure)
- Registering the EX Series Switch with the J-Web Interface
- Generating Support Information Reports for EX Series Switches Using the J-Web Interface
- play_arrow Virtual Chassis Configuration
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- play_arrow Administration
- play_arrow Software, Files, Licenses, Logs
- Uploading a Configuration File (J-Web Procedure)
- Managing Configuration Files Through the Configuration History (J-Web Procedure)
- Setting or Deleting the Rescue Configuration (J-Web Procedure)
- Updating J-Web Interface on EX Series Switches (J-Web Procedure)
- Upgrading Junos OS on EX Series Switches (J-Web Procedure)
- Managing Licenses for the EX Series Switch (J-Web Procedure)
- Rebooting or Halting the EX Series Switch (J-Web Procedure)
- Managing Log, Temporary, and Crash Files on the Switch (J-Web Procedure)
- Registering the EX Series Switch with the J-Web Interface
- Generating Support Information Reports for EX Series Switches Using the J-Web Interface
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- play_arrow Troubleshooting
- play_arrow Troubleshooting Task
- play_arrow FAQ
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Monitoring DHCP Services
Purpose
This topic applies only to the J-Web Application package.
A switch or router can operate as a DHCP server. Use the monitoring functionality to view information about dynamic and static DHCP leases, conflicts, pools, and statistics.
Action
To monitor the DHCP server in the J-Web interface, select Monitor > Services > DHCP.
To monitor the DHCP server in the CLI, enter the following CLI commands:
show system services dhcp bindingshow system services dhcp conflictshow system services dhcp poolshow system services dhcp statisticsshow system services dhcp relay-statisticsshow system services dhcp globalshow system services dhcp clientclear system services dhcp bindingclear system services dhcp conflictclear system services dhcp statisticsclear dhcp relay-statistics
Meaning
Table 1 summarizes the output fields in DHCP displays in the J-Web interface.
Field | Values | Additional Information |
|---|---|---|
| Global tab | ||
Name | This column displays the following information:
| |
Value | Displays the value for each of the parameters in the Name column. | |
| Bindings tab | ||
Allocated Address | List of IP addresses the DHCP server has assigned to clients. | |
MAC Address | Corresponding media access control (MAC) address of the client. | |
Binding Type | Type of binding assigned to the client: dynamic or static. | DHCP servers can assign a dynamic binding from a pool of IP addresses or a static binding to one or more specific IP addresses. |
Lease Expires | Date and time the lease expires, or never for leases that do not expire. | |
| Pools tab | ||
Pool Name | Subnet on which the IP address pool is defined. | |
Low Address | Lowest address in the IP address pool. | |
High Address | Highest address in the IP address pool. | |
Excluded Addresses | Addresses excluded from the address pool. | |
| Clients tab | ||
Interface Name | Name of the logical interface. | |
Hardware Address | Vendor identification. | |
Status | State of the client binding. | |
Address Obtained | IP address obtained from the DHCP server. | |
Update Server | Indicates whether server update is enabled. | |
Lease Obtained | Date and time the lease was obtained. | |
Lease Expires | Date and time the lease expires. | |
Renew | Reacquires an IP address from the server for the interface. When you click this option, the command sends a discover message if the client state is INIT and a renew request message if the client state is BOUND. For all other states it performs no action. | |
Release | Clears other resources received earlier from the server, and reinitializes the client state to INIT for the particular interface. | |
| Conflicts tab | ||
Detection Time | Date and time the client detected the conflict. | |
Detection Method | How the conflict was detected. | Only client-detected conflicts are displayed. |
Address | IP address where the conflict occurs. | The addresses in the conflicts list remain
excluded until you use the |
| DHCP Statistics | ||
| Relay Statistics tab | ||
Packet Counters | Displays the number of packet counters. | |
Dropped Packet Counters | Graphically displays the number of dropped packet counters. | |
| Statistics tab | ||
Packets dropped | Total number of packets dropped and the number of packets dropped due to a particular condition. | |
Messages received | Number of BOOTREQUEST, DHCPDECLINE, DHCPDISCOVER, DHCPINFORM, DHCPRELEASE, and DHCPREQUEST messages sent from DHCP clients and received by the DHCP server. | |
Messages sent | Number of BOOTREPLY, DHCPACK, DHCPOFFER, DHCPNAK, and DHCPFORCERENEW messages sent from the DHCP server to DHCP clients. | |
