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IP SLA - ICMP Echo Configuration - plixer

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					                                                Whitepaper
    IP SLA:
    ICMP Echo Configuration




                              plixer
                                International
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     International                        IP SLA: ICMP Echo Configuration



                                 Table of Contents

    Table of Contents                                                       2

    Introduction                                                            3

    What is the IP SLA ICMP Echo Operation?                                 3

    IOS Version Warning                                                     3

    Steps to Configure the IP SLA Responder                                 3
     Enable IP SLA Responder                                                3
     Verification of Responder Status                                       3

    Steps to Configure ICMP Echo IP SLA                                     4
     IP SLA ICMP Echo Monitor # Availability Verification                   4
     Create Monitor                                                         4
     Specify Type                                                           5
     Specify Tag                                                            5
     Specify Frequency                                                      5
     Specify Owner                                                          5
     Specify Type of Service                                                6
     Enabling the IP SLA TCP Connect Monitor                                7
     Schedule the Monitor to Start                                          7
     Verification of IP SLA ICMP Echo Configuration                         7
     Editing or Removing an IP SLA Monitor                                  8
     Troubleshooting IP SLAs                                                8

    Create IP SLA Reports with Denika Performance Trender                   8
     Steps to create reports in Denika SNMP Performance Trender             9




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    Introduction
    This document will aid an administrator in creating IP SLA ICMP Echo monitors on Cisco routers. It
    also discusses how to create IP SLA reports through SNMP using the Plixer SNMP Performance Trender
    – Denika

    What is the IP SLA ICMP Echo Operation?
    The ICMP Echo operation measures end-to-end response time between a Cisco router and any device
    with an IP Address. The response time is computed by measuring the time taken between sending an
    ICMP Echo request and receiving the Echo reply.

    ICMP Echo response times can be measured between Cisco routers by enabling the IP SLA Responder.
    Using another Cisco router is not required. Skip to the “IP SLA ICMP Echo Monitor # Availability
    Verification” section, if the destination is not a Cisco Router.

    IOS Version Warning
    Some IOS versions support IP SLA operations with slightly different navigation or methods of creation.
    The overall methods for creating IP SLA operations are the same. The administrator may need to use the
    “?” command to apply the correct commands for that IOS.

    Steps to configure the IP SLA Responder
    When setting up an IP SLA responder, the destination router needs to be configured to respond to the
    source router initiating the communication. This step is necessary to generate values for SNMP performance
    trending.

    Enable IP SLA Responder:
    Router (config)# ip sla monitor responder




    Verification of Responder Status:
    Once the responder has been configured, the administrator should verify that the responder is currently
    enabled.

    Router (config)# exit




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    Router# show ip sla monitor responder




    For more details on responder configuration see:
    http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_44_se/configuration/guide/swipsla.html#wp1086179


    Steps to configure ICMP Echo IP SLA

    IP SLA ICMP Echo Monitor # Availability Verification:
    The administrator should first verify that there are no other IP SLA Monitors scheduled with the same
    number. The IOS will not allow the user to overwrite an existing IP SLA Monitor. Existing IP SLA
    Monitors can be viewed by entering the following command:

    Router# show ip sla monitor configuration




    Create Monitor:
    Once the administrator has identified an available number, the administrator can continue with the creation
    of the echo operation. Enter config mode and proceed with the following steps.

    Router (config)# ip sla monitor <1-2147483647>




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    Specify Type:
    Once the monitor has been created, specify what type of monitor should be used along with the required
    configuration options. Below is an example of how to setup a typical ICMP Echo IP SLA Operation.

    Router(config-sla-monitor)# type echo protocol ipicmpecho <ip address
    or Hostname>




    Specify Tag:
    It is necessary to add the line below as it will be picked up by the SNMP measuring tool and used as the
    description of what this IP SLA operation is.

    Router(config-sla-monitor-echo)# tag <Description of this IP SLA
    Operation>




    Specify Frequency:
    The frequency of this monitor should be 300 seconds or less. Giving this monitor a smaller time value
    is acceptable; keeping in mind that increased frequency will create more overhead for the router. A
    frequency of 300 seconds will produce statistics in the SNMP measurement tool.

    Router(config-sla-monitor-echo)# frequency <1-604800>




    Specify Owner:
    The administrator of this IP SLA Monitor should specify the contact responsible for the configuration.
    This is done by adding the owner config line.

    Router(config-sla-monitor-echo)#owner <Name of person or group>




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    Specify Type of Service:
    This line defines a type of service (ToS) byte in the IP header of an IP SLA operation. IP SLA Monitors
    emulate and keep statistics on traffic that is identical to the type of traffic the administrator needs to
    monitor. If the administrator needs to measure traffic in a specific QoS queue, the ToS value associated
    with that queue should be specified. If the ToS is not specified, the ICMP Echo operation will not include
    a QoS tag in the packet. The chart below is useful in determining which Diffserv or decimal to use for
    the ToS config line.




    Router (config-sla-monitor-echo)# tos <0-255>




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    Enabling the IP SLA TCP Connect Monitor:
    The next step is to exit configuration mode and return to exec mode in order to start the IP SLA operation.

    Router(config-sla-monitor-echo)# exit




    Schedule the Monitor to Start:
    Once the monitor configuration has been completed it must be enabled. There are many variations on
    how to schedule IP SLA Monitors. For the purpose of creating dependable reports, the administrator
    should start the monitor upon completion and keep it running, until it is no longer needed.

    Router(config)# ip sla monitor schedule <1-2147483647> start-time now
    life forever




    Verification of IP SLA ICMP Echo Configuration:
    Once the IP SLA Monitor has been started, it will generate statistics on the first transaction between the
    source and destination. The administrator can run statistics on the new IP SLA Monitor by entering:

    Router# show ip sla monitor configuration statistics <1-2147483647>




    It may be necessary to wait a few seconds for the statistics to be generated. The statistics displayed will
    include the number of successes and failures. In a successful implementation the user will see the latest
    round trip time or RTT.

    If the connection results in failure, the problem will be displayed, and it will be necessary to review the
    configuration, or check for possible network issues.




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    Router#show ip sla monitor configuration <1-2147483647>




    Editing or Removing an IP SLA Monitor:
    If the administrator finds a problem with the monitor or would like to make a change in the monitor, the
    monitor must then be removed and recreated by repeating the process. To remove an IP SLA Monitor,
    the command below may be used:

    Router (config)# no ip sla monitor <1-2147483647>




    Troubleshooting IP SLAs:
    If problems persist, try verifying firewall configurations, access lists, or other networking issues that may
    be interfering in the process. The administrator should also make sure that the current IOS version supports
    these IP SLA Operations.

    Create IP SLA Report with Denika Performance Trender




    Once the IP SLA Monitor has been successfully created and scheduled, the administrator is now ready
    to create IP SLA Performance Reports like the ones above with the Denika SNMP Performance Trender.




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    Steps To Create Reports In Denika SNMP Performance Trender:
    1) Download the free version at www.plixer.com
    2) Install Denika on a Windows server
    3) Log in to the web interface
    4) Click on the “discovery button” in the Admin Tools Tab
    5) Click on the “Single Device” button
    6) Enter the IP Address and the SNMP Community string for the router currently being configured for
    SLA Reporting. (If the community string is not public the administrator may simply create a credential
    with the correct community string.)
    7) Click on the “View First” button and select the reports to be created. (Follow the instructions on the
    screen if the reports options wanted are not listed.)
    8) Wait 10-15 minutes for the trends to show up and celebrate.


    If you would like assistance creating reports in Denika feel free to contact us at 207-324-8805, or email
    at: http://plixer.com/support/support_request.php

    For Cisco documentation on IP SLA ICMP Echo and other IP SLA Operations see:
    http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/slah_bk.pdf




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Description: TCP/IP protocol must be very familiar to you, but for ICMP protocol you may know nothing. ICMP protocol is a very important agreement, it is extremely important for network security significance. Here we talk about the ICMP protocol. Internet Control Message Protocol (ICMP) is a TCP / IP protocol suite in a sub-protocol for the IP host, passing control messages between routers. Control of news is that network communication barrier, the host is up, routing is available and other news of the network itself. Although these control messages are not transmitted user data, but for the transmission of user data plays an important role.