Dynamic Host Configuration Protocol (DHCP) Support

casp1032
 
 
In a DHCP environment, the IP addresses of certain devices change based on the DHCP lease. Prior to 10.3, 
DX NetOps Spectrum
 was not able to monitor these types of devices properly.
Starting From 10.3, you can run DNS Lookup to resolve the original IP address of the devices in DHCP environment. 
DNS Lookup
Starting from the 10.3 release, you can trigger DNS lookup to resolve the correct IP address for the following issues:
  • Device Contact Lost
  • Duplicate IP or model
  • Management Agent Lost
  • Device IP swap (Schedule DNS Lookup)
To enable DNS lookup in 
DX NetOps Spectrum
, follow these steps:
  1. Log in to OneClick console.
  2. Click the Explorer tab.
  3. Select the device model on which you want to enable the DNS lookup.
  4. Click the 'Attributes' tab in the Component Details panel.
  5.  
    Search for the '
    do_dns_lookup' 
    attribute.
     
  6. Change the attribute value to 'Yes'.Default: No
    The DNS lookup feature is enabled for the selected model.
 Though the '
do_dns_lookup' 
attribute is set on a device, if the ‘IP redundancy’ is also enabled, it does not trigger the DNS Lookup.
Schedule DNS Lookup
The Schedule DNS lookup is created to perform DNS lookup at a specified date and time. The DNS lookup is triggered only for the models having ' 
do_dns_lookup
' attribute value set to yes, as part of the schedule. 
Follow these steps to schedule a DNS lookup:
  1. Log in to OneClick console.
  2. Click the Explorer tab.
  3. Select the device model on which you want to create a schedule for the DNS lookup.
  4. Navigate to 
    Tools
    Utilities
    Schedule DNS Lookup
    .
    Schedule DNS Lookup.png
     
  5. Select from the 
    Available Schedules
     or create 
    New
     schedules.
    Available recurrences are 
    Daily
    Weekly
    Monthly
    Yearly
    .
    (The time that is specified is relative to the 'SpectroSERVER's local time zone).
    After the schedule is created and attached to a model or group of models, the DNS Lookup is performed on those models when the schedule goes active.
  6. To see the models that are associated to a DNS schedule, navigate to 
    Locater, Schedules, All Schedules
    Information Tab 
    and expand 
    Items Scheduled for DNS Lookup
     subview.
Events for DNS Lookup
The following events are generated, when a DNS schedule is associated and disassociated:
  • 0x11005 - (DNS Schedule is associated)
  • 0x11006 - (DNS Schedule is disassociated)
The following event is generated, when the IP changed after the DNS lookup.
  • 0x11007 
Enable and Disable Event Logging
To enable event logging, from the command-line interface, run the following command:
update action=0x10803 mh=<model handle of the model for which logging has to be enabled>
To disable event logging, from the command-line interface, run the following command:
update action=0x10804 mh=<model handle of the model>
The disable command disables the logging irrespective of the model for which the logging is enabled.
You can find the above events that are captured as part of logging into VNM.OUT.