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CONFIGURATION MANAGEMENT. XML- Based Configuration Management for IP Network Devices by - Sharath Kumar Mallam. Purpose of Configuration Management. As the Internet continues to grow, the tasks of operations and management of IP networks and systems are becoming more difficult.

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CONFIGURATION MANAGEMENT

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CONFIGURATION MANAGEMENT

XML- Based Configuration

Management for IP Network Devices

by - Sharath Kumar Mallam


Purpose of Configuration Management

  • Asthe Internet continues to grow, the tasks of operations and management of IP networks and systems are becoming more difficult.

  • Efficient management techniques and tools are necessary to manage these networks


  • The Simple Network Management Protocol (SNMP) has been the most widely used method for network management.

  • monitors only fault and performance management


Limitations of SNMP

  • Structure of Management Information (SMI).

  • Limited to simple tables of scalar data types.

  • It does not support a hierarchical information model.

  • object identifier (OID).


  • It is difficult to support various operations

  • Does not support Configuration tasks

  • Insufficient for bulk configuration data transfers.

  • Retransmits important data at the SNMP engine because of unreliability


XML technology for configuration management

  • IETF's latest effort, Netconf (Network Configuration).

  • guarantees interoperability in managing devices in a multivendor environment

  • XML-based configuration management

    system (XCMS).


The features of Netconf protocol

  • Netconf uses an RPC paradigm

  • Netconf session

  • distinguishes between configuration data

    and state data

  • distinguish between the distribution of a configuration and the activation of configurations.


Design goals

  • Design goals of the Netconf

    protocol are as follows:

    1.interoperability

    2. transport-neutral protocol

    3. Support actions

    4. ease of implementation


Netconf protocol layers


  • 2.Operation layer : Includes base and additional management operations.

  • a. Base Operations:

    <get-config>,<edit-config>, <copy-config>, <delete-config>, <kill-session>, <lock>,<unlock>,<get-all>

  • Netconf defines configuration datastores, configuration operations.


<running>,<start-up>,<candidate>

b. Additional Management Operations

<commit>,<discard-changes>,<validate>

3.RPC layer

<rpc>,<rpc-reply>,<ok>,<rpc-error>

4.Transport layer

Connection oriented,long-lived.


NETCONF TRANSPORT PROTOCOL

  • Three separate protocol bindings for transport :

    1.Secure Shell (SSH)

    2.SOAP over HTTP and

    3.Block Extensible Exchange Protocol (BEEP)


1.Secure Shell (SSH) :

Netconf uses SSH as mandatory transport protocol

2.SOAP over HTTP

  • Supports its own rpc interface

  • Client driven, synchronous

  • Benefits

  • Parameters of http session state


  • d.uses TLS,IPsec

    4.BEEP

  • Initiate connection

  • Asynchronous


MANAGEMENT PROTOCOL

  • Uses SOAP over HTTP for transport

  • Provides RPC interface

  • Communicates stub and skeleton

  • Generates new definitions

  • Provides several operations

    <edit-config>,<get-config>, <kill-session>,

    <lock>, <unlock>, <get-all>

    <reboot>,<shutdown>,<log>


The architecture of XCMS

Manager

Agent

SOAP

Over

HTTP

Web browser

Mgmt operations

a.RPC operations

Mgmt operations

req

  • Web interfaces

  • XSLT

b.Local operations

b. RPC operations

c. Local operations

res

XML parser

XML parser

File

File

Repository

Repository

Log

Config

urations

Log

Configu

arations

XMLDB

XSL


CONCLUSION

  • Revolutionary approach to solve problems

  • Resolved issues related to configuration management of large number of network devices

  • Used XML technology to resolve the problem of configuration management


References

  • M. Warrerman and T. Goddard. "Using the NETCONF Configuration Protocol over Secure Shell (SSH)." draft-ietf-netconf-ssh-00O. ct., work in progress

  • T. Goddard. "NETCONF wet SOAP," draft-ietf-netconf-soap-01.,work in progress.


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