Consolidated Platform Configuration Guide, Cisco IOS XE 3.3SE (Catalyst 3850 Switches)
Configuring Cisco IOS Configuration Engine
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Contents

Configuring Cisco IOS Configuration Engine

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http:/​/​www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Prerequisites for Configuring the Configuration Engine

  • Obtain the name of the configuration engine instance to which you are connecting.
  • Because the CNS uses both the event bus and the configuration server to provide configurations to devices, you must define both ConfigID and Device ID for each configured switch.
  • All switches configured with the cns config partial global configuration command must access the event bus. The DeviceID, as originated on the switch, must match the DeviceID of the corresponding switch definition in the Cisco Configuration Engine. You must know the hostname of the event bus to which you are connecting.

Restrictions for Configuring the Configuration Engine

  • Within the scope of a single instance of the configuration server, no two configured switches can share the same value for ConfigID.
  • Within the scope of a single instance of the event bus, no two configured switches can share the same value for DeviceID.

Information About Configuring the Configuration Engine

Cisco Configuration Engine Software

The Cisco Configuration Engine is network management utility software that acts as a configuration service for automating the deployment and management of network devices and services. Each Cisco Configuration Engine manages a group of Cisco devices (switches and routers) and the services that they deliver, storing their configurations and delivering them as needed. The Cisco Configuration Engine automates initial configurations and configuration updates by generating device-specific configuration changes, sending them to the device, executing the configuration change, and logging the results.

The Cisco Configuration Engine supports standalone and server modes and has these Cisco Networking Services (CNS) components:

  • Configuration service:
    • Web server
    • File manager
    • Namespace mapping server
  • Event service (event gateway)
  • Data service directory (data models and schema)

In standalone mode, the Cisco Configuration Engine supports an embedded directory service. In this mode, no external directory or other data store is required. In server mode, the Cisco Configuration Engine supports the use of a user-defined external directory.

Figure 1. Cisco Configuration Engine Architectural Overview

Configuration Service

The Configuration Service is the core component of the Cisco Configuration Engine. It consists of a Configuration Server that works with Cisco IOS CNS agents on the switch. The Configuration Service delivers device and service configurations to the switch for initial configuration and mass reconfiguration by logical groups. Switches receive their initial configuration from the Configuration Service when they start up on the network for the first time.

The Configuration Service uses the CNS Event Service to send and receive configuration change events and to send success and failure notifications.

The Configuration Server is a web server that uses configuration templates and the device-specific configuration information stored in the embedded (standalone mode) or remote (server mode) directory.

Configuration templates are text files containing static configuration information in the form of CLI commands. In the templates, variables are specified by using Lightweight Directory Access Protocol (LDAP) URLs that reference the device-specific configuration information stored in a directory.

The Cisco IOS agent can perform a syntax check on received configuration files and publish events to show the success or failure of the syntax check. The configuration agent can either apply configurations immediately or delay the application until receipt of a synchronization event from the configuration server.

Event Service

The Cisco Configuration Engine uses the Event Service for receipt and generation of configuration events. The Event Service consists of an event agent and an event gateway. The event agent is on the switch and facilitates the communication between the switch and the event gateway on the Cisco Configuration Engine.

The Event Service is a highly capable publish-and-subscribe communication method. The Event Service uses subject-based addressing to send messages to their destinations. Subject-based addressing conventions define a simple, uniform namespace for messages and their destinations.

NameSpace Mapper

The Cisco Configuration Engine includes the NameSpace Mapper (NSM) that provides a lookup service for managing logical groups of devices based on application, device or group ID, and event.

Cisco IOS devices recognize only event subject-names that match those configured in Cisco IOS software; for example, cisco.cns.config.load. You can use the namespace mapping service to designate events by using any desired naming convention. When you have populated your data store with your subject names, NSM changes your event subject-name strings to those known by Cisco IOS.

For a subscriber, when given a unique device ID and event, the namespace mapping service returns a set of events to which to subscribe. Similarly, for a publisher, when given a unique group ID, device ID, and event, the mapping service returns a set of events on which to publish.

Cisco Networking Services IDs and Device Hostnames

The Cisco Configuration Engine assumes that a unique identifier is associated with each configured switch. This unique identifier can take on multiple synonyms, where each synonym is unique within a particular namespace. The event service uses namespace content for subject-based addressing of messages.

The Cisco Configuration Engine intersects two namespaces, one for the event bus and the other for the configuration server. Within the scope of the configuration server namespace, the term ConfigID is the unique identifier for a device. Within the scope of the event bus namespace, the term DeviceID is the CNS unique identifier for a device.

ConfigID

Each configured switch has a unique ConfigID, which serves as the key into the Cisco Configuration Engine directory for the corresponding set of switch CLI attributes. The ConfigID defined on the switch must match the ConfigID for the corresponding switch definition on the Cisco Configuration Engine.

The ConfigID is fixed at startup time and cannot be changed until the device restarts, even if the switch hostname is reconfigured.

DeviceID

Each configured switch participating on the event bus has a unique DeviceID, which is analogous to the switch source address so that the switch can be targeted as a specific destination on the bus.

The origin of the DeviceID is defined by the Cisco IOS hostname of the switch. However, the DeviceID variable and its usage reside within the event gateway adjacent to the switch.

The logical Cisco IOS termination point on the event bus is embedded in the event gateway, which in turn functions as a proxy on behalf of the switch. The event gateway represents the switch and its corresponding DeviceID to the event bus.

The switch declares its hostname to the event gateway immediately after the successful connection to the event gateway. The event gateway couples the DeviceID value to the Cisco IOS hostname each time this connection is established. The event gateway retains this DeviceID value for the duration of its connection to the switch.

Hostname and DeviceID

The DeviceID is fixed at the time of the connection to the event gateway and does not change even when the switch hostname is reconfigured.

When changing the switch hostname on the switch, the only way to refresh the DeviceID is to break the connection between the switch and the event gateway. For instructions on refreshing DeviceIDs, see "Related Topics."

When the connection is reestablished, the switch sends its modified hostname to the event gateway. The event gateway redefines the DeviceID to the new value.


Caution


When using the Cisco Configuration Engine user interface, you must first set the DeviceID field to the hostname value that the switch acquires after, not before, and you must reinitialize the configuration for your Cisco IOS CNS agent. Otherwise, subsequent partial configuration command operations may malfunction.


Related Tasks

Hostname, DeviceID, and ConfigID

In standalone mode, when a hostname value is set for a switch, the configuration server uses the hostname as the DeviceID when an event is sent on hostname. If the hostname has not been set, the event is sent on the cn=<value> of the device.

In server mode, the hostname is not used. In this mode, the unique DeviceID attribute is always used for sending an event on the bus. If this attribute is not set, you cannot update the switch.

These and other associated attributes (tag value pairs) are set when you run Setup on the Cisco Configuration Engine.

Cisco IOS CNS Agents

The CNS event agent feature allows the switch to publish and subscribe to events on the event bus and works with the Cisco IOS CNS agent. These agents, embedded in the switch Cisco IOS software, allow the switch to be connected and automatically configured.

Initial Configuration

When the switch first comes up, it attempts to get an IP address by broadcasting a Dynamic Host Configuration Protocol (DHCP) request on the network. Assuming there is no DHCP server on the subnet, the distribution switch acts as a DHCP relay agent and forwards the request to the DHCP server. Upon receiving the request, the DHCP server assigns an IP address to the new switch and includes the Trivial File Transfer Protocol (TFTP) server Internet Protocol (IP) address, the path to the bootstrap configuration file, and the default gateway IP address in a unicast reply to the DHCP relay agent. The DHCP relay agent forwards the reply to the switch.

The switch automatically configures the assigned IP address on interface VLAN 1 (the default) and downloads the bootstrap configuration file from the TFTP server. Upon successful download of the bootstrap configuration file, the switch loads the file in its running configuration.

The Cisco IOS CNS agents initiate communication with the Configuration Engine by using the appropriate ConfigID and EventID. The Configuration Engine maps the Config ID to a template and downloads the full configuration file to the switch.

The following figure shows a sample network configuration for retrieving the initial bootstrap configuration file by using DHCP-based autoconfiguration.

Figure 2. Initial Configuration

Related Concepts

Incremental (Partial) Configuration

After the network is running, new services can be added by using the Cisco IOS CNS 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 random-access memory (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.

Automated CNS Configuration

To enable automated CNS configuration of the switch, you must first complete the prerequisites listed in this topic. When you complete them, power on the switch. At the setup prompt, do nothing; the switch begins the initial configuration. When the full configuration file is loaded on your switch, you do not need to do anything else.

For more information on what happens during initial configuration, see "Related Topics."

Table 1 Prerequisites for Enabling Automatic Configuration

Device

Required Configuration

Access switch

Factory default (no configuration file)

Distribution switch

  • IP helper address
  • Enable DHCP relay agent1
  • IP routing (if used as default gateway)

DHCP server

  • IP address assignment
  • TFTP server IP address
  • Path to bootstrap configuration file on the TFTP server
  • Default gateway IP address

TFTP server

  • A bootstrap configuration file that includes the CNS configuration commands that enable the switch to communicate with the Configuration Engine
  • The switch configured to use either the switch MAC address or the serial number (instead of the default hostname) to generate the ConfigID and EventID
  • The CNS event agent configured to push the configuration file to the switch

CNS Configuration Engine

One or more templates for each type of device, with the ConfigID of the device mapped to the template.

1 A DHCP Relay is needed only when the DHCP Server is on a different subnet from the client.
Related Concepts

How to Configure the Configuration Engine

Enabling the CNS Event Agent


Note


You must enable the CNS event agent on the switch before you enable the CNS configuration agent.


Beginning in privileged EXEC mode, follow these steps to enable the CNS event agent on the switch.

SUMMARY STEPS

    1.    configure terminal

    2.    cns event {hostname | ip-address} [port-number] [ [keepalive seconds retry-count] [failover-time seconds ] [reconnect-time time] | backup]

    3.    end


DETAILED STEPS
      Command or Action Purpose
    Step 1 configure terminal


    Example:
    
                
              
    Switch# configure terminal
    
    
     

    Enters the global configuration mode.

     
    Step 2 cns event {hostname | ip-address} [port-number] [ [keepalive seconds retry-count] [failover-time seconds ] [reconnect-time time] | backup]


    Example:
    Switch(config)# cns event 10.180.1.27 keepalive 120 10
    
     

    Enables the event agent, and enters the gateway parameters.

    • For {hostname | ip-address}, enter either the hostname or the IP address of the event gateway.
    • (Optional) For port number, enter the port number for the event gateway. The default port number is 11011.
    • (Optional) For keepalive seconds, enter how often the switch sends keepalive messages. For retry-count, enter the number of unanswered keepalive messages that the switch sends before the connection is terminated. The default for each is 0.
    • (Optional) For failover-time seconds, enter how long the switch waits for the primary gateway route after the route to the backup gateway is established.
    • (Optional) For reconnect-time time, enter the maximum time interval that the switch waits before trying to reconnect to the event gateway.
    • (Optional) Enter backup to show that this is the backup gateway. (If omitted, this is the primary gateway.)
    Note   

    Though visible in the command-line help string, the encrypt and the clock-timeout time keywords are not supported.

     
    Step 3 end


    Example:
    
                
              
    Switch(config)# end
    
    
     

    Returns to privileged EXEC mode.

     

    This example shows how to enable the CNS event agent, set the IP address gateway to 10.180.1.27, set 120 seconds as the keepalive interval, and set 10 as the retry count.

    Switch(config)# cns event 10.180.1.27 keepalive 120 10
    What to Do Next

    To verify information about the event agent, use the show cns event connections command in privileged EXEC mode.

    To disable the CNS event agent, use the no cns event { ip-address | hostname } global configuration command.

    Related Concepts

    Enabling the Cisco IOS CNS Agent

    Beginning in privileged EXEC mode, follow these steps to enable the Cisco IOS CNS agent on the switch.

    Before You Begin

    You must enable the CNS event agent on the switch before you enable this agent.

    SUMMARY STEPS

      1.    configure terminal

      2.    cns config initial {hostname | ip-address} [port-number]

      3.    cns config partial {hostname | ip-address} [port-number]

      4.    end

      5.    Start the Cisco IOS CNS agent on the switch.


    DETAILED STEPS
        Command or Action Purpose
      Step 1 configure terminal


      Example:
      
                  
                
      Switch# configure terminal
      
      
       

      Enters the global configuration mode.

       
      Step 2 cns config initial {hostname | ip-address} [port-number]


      Example:
      Switch(config)# cns config initial 10.180.1.27 10
      
      
       

      Enables the Cisco IOS CNS agent, and enters the configuration server parameters.

      • For {hostname | ip-address}, enter either the hostname or the IP address of the configuration server.
      • (Optional) For port number, enter the port number for the configuration server.

      This command enables the Cisco IOS CNS agent and initiates an initial configuration on the switch.

       
      Step 3 cns config partial {hostname | ip-address} [port-number]


      Example:
      Switch(config)# cns config partial 10.180.1.27 10
      
      
       

      Enables the Cisco IOS CNS agent, and enters the configuration server parameters.

      • For {hostname | ip-address}, enter either the hostname or the IP address of the configuration server.
      • (Optional) For port number, enter the port number for the configuration server.

      Enables the Cisco IOS CNS agent and initiates a partial configuration on the switch.

       
      Step 4 end


      Example:
      
                  
                
      Switch(config)# end
      
      
       

      Returns to privileged EXEC mode.

       
      Step 5 Start the Cisco IOS CNS agent on the switch.  

       
      What to Do Next

      You can now use the Cisco Configuration Engine to remotely send incremental configurations to the switch.

      Related Tasks

      Enabling an Initial Configuration for Cisco IOS CNS Agent

      Beginning in privileged EXEC mode, follow these steps to enable the CNS configuration agent and initiate an initial configuration on the switch.

      SUMMARY STEPS

        1.    configure terminal

        2.    cns template connect name

        3.    cli config-text

        4.    Repeat Steps 2 to 3 to configure another CNS connect template.

        5.    exit

        6.    cns connect name [retries number] [retry-interval seconds] [sleep seconds] [timeout seconds]

        7.    discover {controller controller-type | dlci [subinterface subinterface-number] | interface [interface-type] | line line-type}

        8.    template name [... name]

        9.    Repeat Steps 7 to 8 to specify more interface parameters and CNS connect templates in the CNS connect profile.

        10.    exit

        11.    hostname name

        12.    ip route network-number

        13.    cns id interface num {dns-reverse | ipaddress | mac-address} [event] [image]

        14.    cns id {hardware-serial | hostname | string string | udi} [event] [image]

        15.    cns config initial {hostname | ip-address} [port-number] [event] [no-persist] [page page] [source ip-address] [syntax-check]

        16.    end


      DETAILED STEPS
          Command or Action Purpose
        Step 1 configure terminal


        Example:
        
                    
                  
        Switch# configure terminal
        
        
         

        Enters the global configuration mode.

         
        Step 2 cns template connect name


        Example:
        Switch(config)# cns template connect template-dhcp
        
         

        Enters CNS template connect configuration mode, and specifies the name of the CNS connect template.

         
        Step 3 cli config-text


        Example:
        Switch(config-tmpl-conn)# cli ip address dhcp
        
         

        Enters a command line for the CNS connect template. Repeat this step for each command line in the template.

         
        Step 4 Repeat Steps 2 to 3 to configure another CNS connect template.   
        Step 5 exit


        Example:
        Switch(config)# exit
        
         

        Returns to global configuration mode.

         
        Step 6 cns connect name [retries number] [retry-interval seconds] [sleep seconds] [timeout seconds]


        Example:
        Switch(config)# cns connect dhcp
        
         

        Enters CNS connect configuration mode, specifies the name of the CNS connect profile, and defines the profile parameters. The switch uses the CNS connect profile to connect to the Configuration Engine.

        • Enter the name of the CNS connect profile.
        • (Optional) For retries number, enter the number of connection retries. The range is 1 to 30. The default is 3.
        • (Optional) For retry-interval seconds, enter the interval between successive connection attempts to the Configuration Engine. The range is 1 to 40 seconds. The default is 10 seconds.
        • (Optional) For sleep seconds, enter the amount of time before which the first connection attempt occurs. The range is 0 to 250 seconds. The default is 0.
        • (Optional) For timeout seconds, enter the amount of time after which the connection attempts end. The range is 10 to 2000 seconds. The default is 120.
         
        Step 7 discover {controller controller-type | dlci [subinterface subinterface-number] | interface [interface-type] | line line-type}


        Example:
        Switch(config-cns-conn)# discover interface gigabitethernet
        
         

        Specifies the interface parameters in the CNS connect profile.

        • For controller controller-type, enter the controller type.
        • For dlci, enter the active data-link connection identifiers (DLCIs). (Optional) For subinterface subinterface-number, specify the point-to-point subinterface number that is used to search for active DLCIs.
        • For interface [interface-type], enter the type of interface.
        • For line line-type, enter the line type.
         
        Step 8 template name [... name]


        Example:
        Switch(config-cns-conn)# template template-dhcp
        
         

        Specifies the list of CNS connect templates in the CNS connect profile to be applied to the switch configuration. You can specify more than one template.

         
        Step 9 Repeat Steps 7 to 8 to specify more interface parameters and CNS connect templates in the CNS connect profile.   
        Step 10 exit


        Example:
        Switch(config-cns-conn)# exit
        
         

        Returns to global configuration mode.

         
        Step 11 hostname name


        Example:
        Switch(config)# hostname device1
        
         

        Enters the hostname for the switch.

         
        Step 12 ip route network-number


        Example:
        RemoteSwitch(config)# ip route 172.28.129.22 255.255.255.255 11.11.11.1
        
         

        (Optional) Establishes a static route to the Configuration Engine whose IP address is network-number.

         
        Step 13 cns id interface num {dns-reverse | ipaddress | mac-address} [event] [image]


        Example:
        RemoteSwitch(config)# cns id GigabitEthernet1/0/1 ipaddress
        
         

        (Optional) Sets the unique EventID or ConfigID used by the Configuration Engine. If you enter this command, do not enter the cns id {hardware-serial | hostname | string string | udi} [event] [image] command.

        • For interface num, enter the type of interface. For example, ethernet, group-async, loopback, or virtual-template. This setting specifies from which interface the IP or MAC address should be retrieved to define the unique ID.
        • For {dns-reverse | ipaddress | mac-address}, enter dns-reverse to retrieve the hostname and assign it as the unique ID, enter ipaddress to use the IP address, or enter mac-address to use the MAC address as the unique ID.
        • (Optional) Enter event to set the ID to be the event-id value used to identify the switch.
        • (Optional) Enter image to set the ID to be the image-id value used to identify the switch.
        Note   

        If both the event and image keywords are omitted, the image-id value is used to identify the switch.

         
        Step 14 cns id {hardware-serial | hostname | string string | udi} [event] [image]


        Example:
        RemoteSwitch(config)# cns id hostname
        
         
        (Optional) Sets the unique EventID or ConfigID used by the Configuration Engine. If you enter this command, do not enter the cns id interface num {dns-reverse | ipaddress | mac-address} [event] [image] command.
        • For { hardware-serial | hostname | string   string | udi }, enter hardware-serial to set the switch serial number as the unique ID, enter hostname (the default) to select the switch hostname as the unique ID, enter an arbitrary text string for string string as the unique ID, or enter udi to set the unique device identifier (UDI) as the unique ID.
         
        Step 15 cns config initial {hostname | ip-address} [port-number] [event] [no-persist] [page page] [source ip-address] [syntax-check]


        Example:
        RemoteSwitch(config)# cns config initial 10.1.1.1 no-persist
        
         

        Enables the Cisco IOS agent, and initiates an initial configuration.

        • For {hostname | ip-address}, enter the hostname or the IP address of the configuration server.
        • (Optional) For port-number, enter the port number of the configuration server. The default port number is 80.
        • (Optional) Enable event for configuration success, failure, or warning messages when the configuration is finished.
        • (Optional) Enable no-persist to suppress the automatic writing to NVRAM of the configuration pulled as a result of entering the cns config initial global configuration command. If the no-persist keyword is not entered, using the cns config initial command causes the resultant configuration to be automatically written to NVRAM.
        • (Optional) For page page, enter the web page of the initial configuration. The default is /Config/config/asp.
        • (Optional) Enter source ip-address to use for source IP address.
        • (Optional) Enable syntax-check to check the syntax when this parameter is entered.
        Note   

        Though visible in the command-line help string, the encrypt, status url, and inventory keywords are not supported.

         
        Step 16 end


        Example:
        RemoteSwitch(config)# end
        
         

        Returns to privileged EXEC mode.

         

        This example shows how to configure an initial configuration on a remote switch when the switch configuration is unknown (the CNS Zero Touch feature).

        Switch(config)# cns template connect template-dhcp
        Switch(config-tmpl-conn)# cli ip address dhcp
        Switch(config-tmpl-conn)# exit
        Switch(config)# cns template connect ip-route
        Switch(config-tmpl-conn)# cli ip route 0.0.0.0 0.0.0.0 ${next-hop}
        Switch(config-tmpl-conn)# exit
        Switch(config)# cns connect dhcp
        Switch(config-cns-conn)# discover interface gigabitethernet
        Switch(config-cns-conn)# template template-dhcp
        Switch(config-cns-conn)# template ip-route
        Switch(config-cns-conn)# exit
        Switch(config)# hostname RemoteSwitch
        RemoteSwitch(config)# cns config initial 10.1.1.1 no-persist

        This example shows how to configure an initial configuration on a remote switch when the switch IP address is known. The Configuration Engine IP address is 172.28.129.22.

        Switch(config)# cns template connect template-dhcp
        Switch(config-tmpl-conn)# cli ip address dhcp
        Switch(config-tmpl-conn)# exit
        Switch(config)# cns template connect ip-route
        Switch(config-tmpl-conn)# cli ip route 0.0.0.0 0.0.0.0 ${next-hop}
        Switch(config-tmpl-conn)# exit
        Switch(config)# cns connect dhcp
        Switch(config-cns-conn)# discover interface gigabitethernet
        Switch(config-cns-conn)# template template-dhcp
        Switch(config-cns-conn)# template ip-route
        Switch(config-cns-conn)# exit
        Switch(config)# hostname RemoteSwitch
        RemoteSwitch(config)# ip route 172.28.129.22 255.255.255.255 11.11.11.1
        RemoteSwitch(config)# cns id ethernet 0 ipaddress
        RemoteSwitch(config)# cns config initial 172.28.129.22 no-persist
        What to Do Next

        To verify information about the configuration agent, use the show cns config connections command in privileged EXEC mode.

        To disable the CNS Cisco IOS agent, use the no cns config initial { ip-address | hostname } global configuration command.

        Refreshing DeviceIDs

        Beginning in privileged EXEC mode, follow these steps to refresh a DeviceID when changing the hostname on the switch.

        SUMMARY STEPS

          1.    show cns config connections

          2.    Make sure that the CNS event agent is properly connected to the event gateway.

          3.    show cns event connections

          4.    Record from the output of Step 3 the information for the currently connected connection listed below. You will be using the IP address and port number in subsequent steps of these instructions.

          5.    configure terminal

          6.    no cns event ip-address port-number

          7.    cns event ip-address port-number

          8.    end

          9.    Make sure that you have reestablished the connection between the switch and the event connection by examining the output from show cns event connections.


        DETAILED STEPS
            Command or Action Purpose
          Step 1 show cns config connections


          Example:
          Switch# show cns config connections
           

          Displays whether the CNS event agent is connecting to the gateway, connected, or active, and the gateway used by the event agent, its IP address and port number.

           
          Step 2 Make sure that the CNS event agent is properly connected to the event gateway. 

          Examine the output of show cns config connections for the following:

          • Connection is active.
          • Connection is using the currently configured switch hostname. The DeviceID will be refreshed to correspond to the new hostname configuration using these instructions.
           
          Step 3 show cns event connections


          Example:
          Switch# show cns event connections
           

          Displays the event connection information for your switch.

           
          Step 4 Record from the output of Step 3 the information for the currently connected connection listed below. You will be using the IP address and port number in subsequent steps of these instructions.   
          Step 5 configure terminal


          Example:
          Switch# configure terminal
           

          Enters global configuration mode.

           
          Step 6 no cns event ip-address port-number


          Example:
          Switch(config)# no cns event 172.28.129.22 2012
           

          Specifies the IP address and port number that you recorded in Step 4 in this command.

          This command breaks the connection between the switch and the event gateway. It is necessary to first break, then reestablish, this connection to refresh the DeviceID.

           
          Step 7 cns event ip-address port-number


          Example:
          Switch(config)# cns event 172.28.129.22 2012
           

          Specifies the IP address and port number that you recorded in Step 4 in this command.

          This command reestablishes the connection between the switch and the event gateway.

           
          Step 8 end


          Example:
          
                      
                    
          Switch(config)# end
          
          
           

          Returns to privileged EXEC mode.

           
          Step 9 Make sure that you have reestablished the connection between the switch and the event connection by examining the output from show cns event connections. 

           
          Related Concepts

          Enabling a Partial Configuration for Cisco IOS CNS Agent

          Beginning in privileged EXEC mode, follow these steps to enable the Cisco IOS CNS agent and to initiate a partial configuration on the switch.

          SUMMARY STEPS

            1.    configure terminal

            2.    cns config partial {ip-address | hostname} [port-number] [source ip-address]

            3.    end


          DETAILED STEPS
              Command or Action Purpose
            Step 1 configure terminal


            Example:
            
                        
                      
            Switch# configure terminal
            
            
             

            Enters the global configuration mode.

             
            Step 2 cns config partial {ip-address | hostname} [port-number] [source ip-address]


            Example:
            Switch(config)# cns config partial 172.28.129.22 2013
            
             

            Enables the configuration agent, and initiates a partial configuration.

            • For {ip-address | hostname}, enter the IP address or the hostname of the configuration server.
            • (Optional) For port-number, enter the port number of the configuration server. The default port number is 80.
            • (Optional) Enter source ip-address to use for the source IP address.
            Note   

            Though visible in the command-line help string, the encrypt keyword is not supported.

             
            Step 3 end


            Example:
            
                        
                      
            Switch(config)# end
            
            
             

            Returns to privileged EXEC mode.

             
            What to Do Next

            To verify information about the configuration agent, use either the show cns config stats or the show cns config outstanding command in privileged EXEC mode.

            To disable the Cisco IOS agent, use the no cns config partial { ip-address | hostname } global configuration command. To cancel a partial configuration, use the cns config cancel global configuration command.

            Monitoring CNS Configurations

            Table 2 CNS show Commands

            Command

            Purpose

            show cns config connections

            Switch# show cns config connections
            

            Displays the status of the CNS Cisco IOS CNS agent connections.

            show cns config outstanding

            Switch# show cns config outstanding
            

            Displays information about incremental (partial) CNS configurations that have started but are not yet completed.

            show cns config stats

            Switch# show cns config stats
            

            Displays statistics about the Cisco IOS CNS agent.

            show cns event connections

            Switch# show cns event connections
            

            Displays the status of the CNS event agent connections.

            show cns event gateway

            Switch# show cns event gateway
            

            Displays the event gateway information for your switch.

            show cns event stats

            Switch# show cns event stats
            

            Displays statistics about the CNS event agent.

            show cns event subject

            Switch# show cns event subject
            

            Displays a list of event agent subjects that are subscribed to by applications.

            Additional References

            Related Documents

            Related Topic Document Title
            Configuration Engine Setup

            Cisco Configuration Engine Installation and Setup Guide, 1.5 for Linux http:/​/​www.cisco.com/​en/​US/​docs/​net_mgmt/​configuration_engine/​1.5/​installation_linux/​guide/​setup_​1.html

            Error Message Decoder

            Description Link

            To help you research and resolve system error messages in this release, use the Error Message Decoder tool.

            https:/​/​www.cisco.com/​cgi-bin/​Support/​Errordecoder/​index.cgi

            MIBs

            MIB MIBs Link
             

            To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

            http:/​/​www.cisco.com/​go/​mibs

            Technical Assistance

            Description Link

            The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

            To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

            Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

            http:/​/​www.cisco.com/​support

            Feature History and Information for the Configuration Engine

            Release

            Modification

            Cisco IOS XE 3.2SE

            This feature was introduced.