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Catalyst 2950 Desktop Switch Software Configuration Guide
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Chapter5 Configuring IE2100 CNS Agents
Configuring CNS Embedded Agents
Incremental (Partial) Configuration
After the network is running, new services can be added by using the CNS configuration agent.
Incremental (partial) configurations can be sent to the switch. The actual configuration can be sent as an
event payload by way of the event gateway (push operation) or as a signal event that triggers the switch
to initiate a pull operation.
The switch can check the syntax of the configuration before applying it. If the syntax is correct, the
switch applies the incremental configuration and publishes an event that signals success to the
configuration server. If the switch does not apply the incremental configuration, it publishes an event
showing an error status. When the switch has applied the incremental configuration, it can write it to
nonvolatile RAM (NVRAM) or wait until signaled to do so.
Synchronized Configuration
When the switch receives a configuration, it can defer application of the configuration upon receipt of a
write-signal event. The write-signal event tells the switch not to save the updated configuration into its
NVRAM. The switch uses the updated configuration as its running configuration. This ensures that the
switch configuration is synchronized with other network activities before saving the configuration in
NVRAM for use at the next reboot.
Configuring CNS Embedded Agents
The CNS agents embedded in the switch IOS software allow the switch to be connected and
automatically configured as described in the “Enabling Automated CNS Configuration” section on
page 5-6. If you want to change the configuration or install a custom configuration, see these sections
for instructions:
• Enabling the CNS Event Agent, page 5-8
• Enabling the CNS Configuration Agent, page 5-9
Enabling Automated CNS Configuration
To enable automated CNS configuration of the switch, you must first complete the prerequisites in
Table 5-1. When you complet them, power on the switch. At the setup prompt, do nothing: The switch
begins the initial configuration as described in the “Initial Configuration” section on page 5-5. When the
full configuration file is loaded on your switch, you need to do nothing else.
Table 5-1 Prerequisites for Enabling Automatic Configuration
Device Required Configuration
Access switch Factory default (no configuration file)
Distribution switch
• IP helper address
• Enable DHCP relay agent
• IP routing (if used as default gateway)