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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 5 Configuring Cisco IOS CNS Agents
Understanding Cisco IOS Agents
Figure 5-2 Initial Configuration Overview
Incremental (Partial) Configuration
After the network is running, new services can be added by using the Cisco IOS 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
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.
Cisco 576
LRE 997
POTS telephones
POTS
splitter
POTS
splitter
Laptop
Cisco router
7500
Central office
Copper twisted pair
Offices and users
89380
Required
microfilter
Building 1
Building 2
Building 3
Building 4
Catalyst 2950ST-24
LRE 997 switches
(DC-input power)
Cisco 576 LRE 997 CPE