Frequently Asked Questions — calibre 1



Example 5-3 illustrates the results of the reachability verification tests from R3 to the DNS servers. R3#show ip route static S* 0.0.0.0 0.0.0.0 [1/0] via .2.2 R3# To exame the routg behavior when connectivity to the R2 DNS is restored IP routg debuggg is enabled on R3 aga with the debug ip routg command and the DNS address on R2 is enabled by performg a no shutdown command on the loopback 0 terface on R2 The debug output on R3 is shown Example 5-12 The EIGRP route to 10.0.8.2 comes up and almost immediately the default static route via .1.2 (R2). (Optional) Specifies that the route will not be removed even if the terface shuts down track number (Optional) Associates a track object with this route Valid values for the number argument range from 1 to 500 tag tag (Optional) Tag value that can be used as a "match" value for controllg redistribution via. Use the timeout milliseconds IP SLA configuration submode command (or rtr configuration submode command) to set the amount of time a Cisco IP SLAs operation waits for a response from its request packet (For example this command can be entered with the icmp-echo command mode.) The milliseconds parameter is the number of milliseconds (ms) the operation waits to receive a response from its request packet It is recommended that the value of the milliseconds parameter be based on the sum of both the maximum RTT value for the packets and the processg time of the IP SLAs operation. Push Notification Providers Most of these are paid services some have. Cards Card based UI's pan gestures flip and swipe animations Effective with Cisco Release 12.4(20)T 12.2(33)SXI1 12.2(33)SRE and Cisco XE Release 2.4 the show ip sla monitor configuration command is replaced by the show ip sla configuration command Use the show ip sla statistics [operation-number] [details] command (or the show ip sla monitor statistics [operation-number] [details] command) to display the current operational status and statistics of all Cisco IP SLAs operations or of a specified operation The parameters of these commands are defed Table 5-8 Table 5-8 show ip sla statistics and show ip sla monitor statistics Commands Parameter Description Parameter Description operation-number Number of the IP SLAs operation to schedule life forever (Optional) Schedules the operation to run defitely life seconds Figure 5-4 A Branch Office Scenario this scenario the edge router can detect if there is a direct failure on the lk to one ISP and that case use the other ISP for all traffic However if the frastructure with of one of the ISPs fails and the lk to that ISP remas up the edge router would contue to use that lk because the static default route would still. Blockcha Tool for smart contract teractions Bitco protocol implementations and Frameworks for teractg with cryptocurrencies. The debug ip routg command may generate a significant amount of output The debug output on R3 is shown Example 5- The EIGRP route to 10.0.8.2 is immediately deleted and there are now no routes to 10.0.8.2 This is the object beg tracked with the track 2 command; it tracks reachability to IP SLAs object 100 which is an ICMP echo to 10.0.8.2 After about 10 seconds the value specified the delay command the static default route via .1.2 (R2) is deleted. Eventbus Promises and Futures libraries to help you write better async. Ip sla monitor type echo protocol ipIcmpEcho 10.0.8.1 frequency 10 ip sla monitor schedule life forever start-time now ip sla monitor 100 type echo protocol ipIcmpEcho 10.0.8.2 frequency 10 ip sla monitor schedule 100 life forever start-time now The IP SLAs configuration is verified next usg the show ip sla monitor configuration command The partial output is shown Example 5-5 illustratg the details of the configuration of operation This output confirms that the operation is an echo operation to 10.0.8.1 with a frequency of 10 seconds and that it has already started (the start time has already passed). R3#show ip route static S* 0.0.0.0 0.0.0.0 [1/0] via .2.2 via .1.2 An alternative solution for this example network usg PBR is presented at the end of the next section after PBR is detailed summary there are many possibilities available with object trackg and Cisco IP SLAs As shown these examples you can base a probe on reachability changg routg operations and path control based on the ability to reach an object You can also use Cisco IP SLAs with Cisco Optimized Edge Routg (OER) to allow paths to be changed based on network conditions such as delay load and so forth (Cisco OER allows the best exit path to be selected based on a defed policy and is described briefly the "Cisco Optimized Edge Routg" section later this chapter.) Month (Optional) Name of the month to start the operation If month is not specified the current month is used Use of this argument requires that a day be specified You can specify the month by usg either the full English name or the first three letters of the month day (Optional) Number of the day ( the range 1 to 31) to start the operation on If a day is not specified the current day is used Use of this argument requires that a month be specified pendg The next section troduces some of the commands used to verify path control usg IP SLAs The section after that illustrates two examples of IP SLAs configuration and verification Verifyg Path Control Usg IP SLAs This section describes some of the commands used to verify path control usg IP SLAs Use the show ip sla configuration [operation] command (or the show ip sla monitor configuration [operation] command) to display configuration values cludg all defaults for all Cisco IP SLAs operations or for a specified operation The operation parameter is the number of the IP SLAs operation for which the details will be displayed NOTE Files File management file browser zip handlg and file observers. Gcd Grand Central Dispatch syntax sugars tools and timers. Architecture Patterns Clean architecture Viper MVVM Reactive choose your weapon. Functional Programmg Collection of Swift functional programmg tools. Courses Gettg Started Courses tutorials and guides Database Wrappers clients Parse alternatives and safe tools to deal with ephemeral and persistent data. From IP SLA configuration mode a variety of commands can be entered as. Debuggg Debuggg tools crash reports logs and console UI's. Lter Static code analyzers to enforce style and conventions. At the start of the control phase the IP SLAs source sends a control message with the configured IP SLAs operation formation to IP SLAs control port UDP 167 on the target router (the responder) The control message cludes the protocol port number and duration of the operation Figure 5-7 UDP port 2020 is used for the IP SLAs test packets If MD5 authentication is enabled the MD5 checksum is sent with the control message and the responder verifies the MD5 checksum If the authentication fails the responder returns an "authentication failure" message. The first step this configuration defes the probe; probe 11 is defed by the ip sla monitor 11 command The test defed with the type echo protocol ipIcmpEcho 10.1.1.1 source-terface FastEthernet0/0 command specifies that the ICMP echoes are sent to destation 10.1.1.1 (R2) to check connectivity with the Fast Ethernet 0/0 terface used as the source terface The frequency 10 command schedules the connectivity test to repeat every 10 seconds The ip sla monitor schedule 11 life forever start-time now command defes the start and end time of the connectivity test for probe 11; the start time is now and it will contue forever. Cisco IP SLAs measurements perform active monitorg by generatg and analyzg traffic to measure performance between Cisco Software devices or between a Cisco device and a host such as a network application server With the IP SLAs feature enabled a router sends synthetic traffic to the other device as illustrated Figure 5-6 Figure 5-6 IP SLAs Take Measurements Between a Cisco Device and Another Cisco Device or. The embedded Cisco IP SLAs measurement capability allows network managers to vali network performance proactively identify network issues and verify service guarantees by usg active monitorg to generate probe traffic a contuous reliable and predictable manner This measurement capability also helps create a network that is "performance aware." Usg IP SLAs measurements Cisco network equipment can verify service guarantees vali network performance improve network reliability proactively identify network issues and react to performance metrics with changes to the configuration and network The Cisco IP SLAs feature allows performance measurements to be taken with and between Cisco devices or between a Cisco device and a host providg data about service levels for IP applications and services. The IP SLAs source sends a test packet at time T1 Because of other high-priority processes routers might take tens of milliseconds to process comg packets For example the reply to a test packet might be sittg a queue waitg to be processed To account for this delay the IP SLAs responder cludes both the receipt time (T2) and the transmitted time (T3) the response packet The time stamps are accurate to submilliseconds The IP SLAs source subtracts T2 from T3 to determe the delta value—the time spent processg the test packet the IP SLAs responder The delta value is subtracted from the overall RTT The same prciple is applied by IP SLAs source The comg time stamp (T4) is taken at the terrupt level to allow for greater accuracy the RTT calculation The T4 time stamp rather than the T5 time stamp (when the packet is processed) is used the RTT calculation. & Time Time and NSCalendar libraries Also contas Sunrise and Sunset time generators time pickers and NSTimer terfaces. About A curated list of awesome frameworks libraries tutorials Xcode extensions and plugs components and much more The list is divided to categories such as Frameworks Components Testg and others open source projects free and paid services There is no pre-established order of items each category the order is for contribution If you want to contribute please read. (Optional) Number of seconds to keep the operation memory when it is not actively collectg formation The default is 0 seconds (never ages out) recurrg (Optional) dicates that the operation will start automatically at the specified time and for the specified duration every day NOTE Effective with Cisco Release 12.4(4)T 12.2(33)SB and 12.2(33)SXI the ip sla monitor schedule command is replaced by the ip sla schedule command. Figure 5-7 IP SLAs Operation with a Responder Cisco IP SLAs with Responder Time Stamps Figure 5-8 illustrates the use of time stamps round-trip calculations an operation usg an IP SLAs responder The IP SLAs source uses four time stamps for the round-trip time (RTT) calculation Figure 5-8 Time Stamps an IP SLAs Operation with a Responder. The IP SLAs measurement accuracy is improved when the target is an IP SLAs responder as described the upcomg "Cisco IP SLAs Operation with Responders" section Cisco IP SLAs Operations An IP SLAs operation is a measurement that cludes protocol frequency traps and thresholds The network manager configures the IP SLAs source with the target device address protocol and User Datagram Protocol (UDP) or Transfer Control Protocol (TCP) port number for each operation When the operation is fished and the response has been received the results are stored the IP SLAs MIB on the source and are retrieved. Debuggg is disabled and the statistics are viewed aga usg the show ip sla monitor statistics command as displayed Example 5-10 This output confirms that there have been 11 failures on the IP SLAs object 100; these are failures the ICMP echo to 10.0.8.2 The latest return code is "Timeout." This section troduces Cisco IP SLAs and describes how this feature is used to control path selection Cisco IP SLAs use active traffic monitorg generatg traffic a contuous reliable and predictable manner to measure network performance Cisco IP SLAs illustrated Figure 5-5 send simulated data across the network and measure performance between multiple network locations or across multiple network paths The formation collected cludes data about response time one-way latency jitter (terpacket delay variance) packet loss voice-quality scorg network resource availability application performance and server response time its simplest form Cisco IP SLAs verify whether a network element such as an IP address on a router terface or an open TCP port on an IP host is active and responsive. All the IP SLAs measurement probe operations are configured on the IP SLAs source either via the command-le terface (CLI) or through an SNMP tool that supports the operation of IP SLAs The source sends probe packets to the target There are two types of IP SLAs operations: those which the target device is runng the IP SLAs responder component (such as a Cisco router) and those which the target device is not runng the IP SLAs responder component (such as a web server or IP host) An IP SLAs responder is a component embedded a Cisco device that allows that device to anticipate and respond to IP SLAs request packets A Cisco device can be configured as an IP SLAs responder and will provide accurate measurements without the need for dedicated probes or any complex or per-operation configuration. Object-Number Object number representg the object to be tracked The range is from 1 to 500 operation-number Number used for the identification of the IP SLAs operation you are trackg state Tracks the operation return code reachability Tracks whether the route is reachable. Github is home to over 28 million developers workg together to host and review code manage projects and build software together. This section uses two examples to illustrate IP SLAs configuration and verification Trackg Reachability to Two ISPs Figure 5- illustrates a scenario which Customer A is multihomg to two ISPs Customer A is not usg BGP with the ISPs; stead it is usg static default routes Two default static routes with admistrative distances are configured so that the lk to ISP-1 is the primary lk and the lk to ISP-2 is the backup lk The static default route with the lower admistrative distance will be preferred and jected to the. Note Effective with Cisco Release 12.4(20)T 12.2(33)SXI1 12.2(33)SRE and Cisco XE Release 2.4 the track rtr command is replaced by the track ip sla command Use the delay {up seconds [down seconds] | [up seconds] down seconds} track configuration command to specify a period of time to delay communicatg state changes of a tracked object The parameters of this command are defed Table 5-6 Table 5-6 delay Commands Parameter Description Core Data Core data Frameworks wrappers generators and boilerplates. Other Awesome Lists Other amazgly awesome lists can be. App Routg Elegant URL routg navigation frameworks deep lks. Apple TV tvOS view controllers wrappers template managers and video players. Localization Tools to manage strgs files translate and enable localization. Use Git or checkout with SVN usg the. There are multiple solutions to this issue One approach is for the branch office router to run a dynamic routg protocol with the ISPs so that the branch router learns the ISPs' networks its routg table The branch router will then be aware of any lk failures with the ISPs' network This solution is impractical for smaller branch offices and any case requires teraction and tegration with the ISPs It may however be the best solution for critical branch offices or those with large traffic volumes Another solution is to use either static routes or PBR but make them subject to reachability tests toward critical destations such as the Doma Name System (DNS) servers with the ISP If the DNS servers one of the ISPs go down or are unreachable the static route toward that ISP would be removed These reachability tests can be performed with Cisco IP SLAs that probe the DNS servers frequently and that are attached to the static routes. Go back Launchg GitHub Desktop If nothg happens download GitHub Desktop and try aga Go back Launchg Xcode If nothg happens download Xcode and try aga. Server Server side projects supportg coroutes Lux MacOS Apache Modules Async calls libuv. Data Structures / Algorithms Diffs keypaths sorted lists and other amazg data structures wrappers and libraries. .usprt When a network manager configures an IP SLAs operation on the IP SLAs source reaction conditions can also be defed and the operation can be scheduled to be run for a period of time to gather statistics The source uses the IP SLAs control protocol to communicate with the responder before sendg test packets To crease security of IP SLAs control messages message digest 5 (MD5) authentication can be used to secure the control protocol exchange The followg sequence of events occurs for each IP SLAs operation that requires a responder on the target as illustrated Figure 5-7: The tools used for this solution clude the followg: R3#show ip sla monitor statistics <Output omitted> Round Trip Time (RTT) for dex 100 Latest RTT: NoConnection/Busy/Timeout Latest operation start time: *17:2 UTC Sun Aug 2 200 Latest operation return code: Timeout Number of successes: 80 Number of failures: 11 Operation time to live: Forever R3# The static routes the IP routg table now are shown Example 5-11 This output confirms that only one static default remas via 12168.2.2 (R1). Ip SLAs operations are specific to target devices Operations such as DNS or HTTP can be sent to any suitable computer For operations such as testg the port used by a database there might be risks associated with unexpected effects on actual database servers and therefore IP SLAs responder functionality on a router can be configured to respond place of the actual database server Cisco IP SLAs Operation with Responders Usg an IP SLAs responder provides enhanced measurement accuracy—without the need for dedicated third-party external probe devices—and additional statistics that are not otherwise available via standard ternet Control Message Protocol (ICMP)-based measurements. Figure 5-10 illustrates the network for this example scenario R3 represents a branch office connected to two ISPs this scenario Cisco IP SLAs are used to track the reachability to the DNS servers (with IP addresses 10.0.8.1 and 10.0.8.2) and tie the results to the static default routes on R3 If there is a DNS server failure the Cisco IP SLAs probes will fail the static default route to that DNS will be removed and all traffic will be rerouted toward the. Note The responder is capable of respondg to multiple IP SLAs measurement operations that try to connect to the same port number. Code Quality Quality always matters Code checkers memory vigilants syntastic sugars. If nothg happens download the GitHub extension for Visual Studio and try aga. (Optional) Enables a Dynamic Host Configuration Protocol (DHCP) server to assign a static route to a default gateway (option 3) Note that you specify the dhcp keyword for each routg protocol distance (Optional) Admistrative distance The default admistrative distance for a static route is 1 name next-hop-name (Optional) Applies a name to the specified route permanent Up Time to delay the notification of an up event down Time to delay the notification of a down event seconds Delay value seconds The range is from 0 to 180 The default is 0 Configurg the Action Associated with the Trackg Object This section describes one of the configuration commands used to defe the action associated with the trackg object. Analytics Analytics platforms SDK's error trackg and real-time answers about. This section exames path control usg Cisco IP SLAs A typical scenario for this solution is ternet branch office connectivity with connections to two ISPs such as the network illustrated Figure 5-4 this case the organization's edge router is configured to perform NAT and has default routes for outbound traffic to the ISPs; branch offices especially smaller ones are not likely to run BGP or other routg protocols toward the ISP The static default routes are likely to be equal cost and the Cisco will by default load balance over the lks on a per-destation basis NAT will be applied to the outbound traffic resultg from the load- balancg algorithm. Description destation-ip-address | destation-hostname Destation IPv4 or IPv6 address or hostname source-ip {ip-address | hostname} (or source-ipaddr {ip-address | hostname}) (Optional) Specifies the source IPv4 or IPv6 address or hostname When a source IP address or hostname is not specified the IP SLAs chooses the IP address nearest to the destation. Figure 5- Trackg Reachability to Two ISPs Example Network However if there is a problem with the ISP-1 router or with its connectivity toward the ternet but its terface to Customer A is still up all traffic from Customer A will still go to that ISP This traffic may then get lost with the ISP The solution to this issue is the Cisco IP SLAs functionality which can be used to contuously check the reachability of a specific destation (such as a provider edge [PE] router terface the ISP's DNS server or any other specific destation) and conditionally announce the default route only if the connectivity is verified The Cisco IP SLAs configuration of R1 is provided Example 5-2. These steps are detailed the followg sections Configurg Cisco IP SLAs Operations This section describes some of the configuration commands used to defe IP SLAs operations Use the ip sla operation-number global configuration command (or the ip sla monitor operation-number global configuration command) to beg configurg a Cisco IP SLAs operation and to enter IP SLA configuration mode (or rtr configuration mode) The operation-number is the identification number of the IP SLAs operation you want to configure NOTE Effective with Cisco Release 12.4(4)T 12.2(33)SB and 12.2(33)SXI the ip sla monitor command is replaced by the ip sla command NOTE

Cache Thread safe offle and high performance cache libs and frameworks. Concurrency Job schedulers Coroutes Asynchronous and Type safe threads libs and frameworks written Swift Operation-Number (Optional) Number of the operation for which operational status and statistics are displayed details (Optional) Operational status and statistics are displayed greater detail NOTE Effective with Cisco Release 12.4(20)T 12.2(33)SXI1 12.2(33)SRE and Cisco XE Release 2.4 the show ip sla monitor statistics command is replaced by the show ip sla statistics command. The next step is to configure trackg objects as illustrated Example 5-7 The first trackg object is tied to IP SLAs object and has 10 seconds of down delay and 1 second of up delay representg the level of sensitivity to changes of tracked objects The delay helps to alleviate the affect of flappg objects those that are gog down and up rapidly this case if the DNS server fails momentarily and comes back up with 10 seconds there is no impact The ip route command creates a static default route via .2.2 (R1) that appears or disappears dependg on the success or failure of the IP SLAs operation Notice that this command reference the trackg object number 1 which turn reference IP SLAs operation number The second trackg object is tied to IP SLAs object 100 and has a similar configuration. After confirmg that the reachability tests are successful the Cisco IP SLAs are configured The configuration is shown Example 5-4 The ip sla monitor command is used to create an ICMP echo probe on R3 to the first DNS server; the operation number is locally significant only to the router (Note that there are many other types of probes other than the ICMP echo probes that could be created.) The frequency 10 command schedules the connectivity test to repeat every 10 seconds The probe is scheduled to start now and to run forever A second probe 100 is similarly created to test connectivity to the second DNS server. Stabug has just released their visual repro steps feature to enable you to trace all the views that the user teracted with before a bug or a crash occured This will help you reproduce bugs and fix them 10x faster We highly recommend tegratg stabug’s framework as they compiled a lot of other great features like network logs and screen annotations providg you with useful and rich data attached to each bug or crash report stabug is offerg awesome- community an exclusive 15% discount on all paid plans Go to 1 mute tegration guide Figure 5-10 Trackg Reachability to DNS Servers the Two ISPs Example Network NOTE This network was created a lab to simulate a branch office scenario The DNS server addresses are simulated by loopback 0 terfaces on R1 and R2 EIGRP is runng between R1 R2 and R3 The followg steps detail the implementation and verification of Cisco IP SLAs this example: Color Hex color extensions themg color pickers and other awesome. Home > Articles > Cisco Network Technology > General Networkg > CCNP ROUTE 642-02 Exam Foundation Learng: Implementg Path Control Authentication Oauth and Oauth2 libraries social logs and captcha tools. The show ip sla monitor statistics command is used next to display the number of successes failures and the results of the latest operations The output is shown Example 5-6 and it confirms that operation has succeeded 16 times already had no failures and the last operation returned an "OK" result Operation 100 has succeeded 15 times had no failures and its last operation also returned an "OK" result. Use the ip route prefix mask {ip-address | terface-type terface-number [ip-address]} [dhcp] [distance] [name next-hop-name] [permanent | track number] [tag tag] global configuration command to establish a static route that tracks an object The parameters of this command are defed Table 5-7 Table 5-7 ip route Command Parameter Description prefix 3W6D: RT: SET_LAST_RDB for 10.0.8.2 . NEW rdb: via .1.2 3w6d: RT: add 10.0.8.2 . via .1.2 eigrp metric [0/156160] 3w6d: RT: NET-RED 10.0.8.2 . R3# 3w6d: RT: add 0.0.0.0 0.0.0.0 via .1.2 static metric [1/0] 3w6d: RT: NET-RED 0.0.0.0 0.0.0.0 3w6d: RT: NET-RED 0.0.0.0 0.0.0.0 R3# 3w6d: RT: NET-RED 0.0.0.0 0.0.0.0 R3# The routg table now is shown Example 5-13; both static default routes are there Full connectivity has been restored. (Optional) No formation is collected This is the default value now (Optional) dicates that the operation should start immediately after hh:mm:ss (Optional) dicates that the operation should start hh hours mm mutes and ss seconds after this command was entered ageout seconds Charts Beautiful Easy and Fully customized charts Implementg Cisco IP Routg (ROUTE) Foundation Learng Guide: Foundation learng for the ROUTE 642-02 Exam $

Home > Articles > Cisco Network Technology > General NetworkgGeneral NetworkgAll General Networkg Articles Subscribe to this topic  RSS detailsShowg 1-20 of 32 Sort by | Title See All PromotionsAboutAffiliatesCisco Systems t UsFAQJobsLegal NoticePrivacy NoticeSite HelpSite MapWrite for Us© 2018 Pearson Education Cisco Press All rights reserved Cisco IP SLAs use the Cisco Round-Trip Time Monitor (RTTMON) Management formation Base (MIB) for communication between the external Network Management System (NMS) applications and the Cisco IP SLAs operations runng on the Cisco devices As an additional feature SNMP notifications based on the data gathered by a Cisco IP SLAs operation allow the router to receive alerts when performance drops below a specified level and when problems are corrected These thresholds can trigger additional events and actions The followg sections detail IP SLAs termology and operation before configuration verification and examples are provided later sections. © 2018 Pearson Education Cisco Press All rights reserved 800 East 6th Street dianapolis. Bridgg Sharg code between Objective-C and Swift and macOS Javascript and Objective-C. Command Le Smart beauftil and elegant tools to help you create command le applications. Source-Terface terface-name (Optional) Specifies the source terface for the operation NOTE Effective with Cisco Release 12.4(4)T 12.2(33)SB and 12.2(33)SXI the type echo protocol ipIcmpEcho command is replaced by the icmp-echo command Use the frequency seconds IP SLA configuration submode command (or rtr configuration submode command) to set the rate at which a specified IP SLAs operation repeats (For example this command can be entered with the icmp-echo command mode.) The seconds parameter is the number of seconds between the IP SLAs operations; the default. This scenario requires the configuration of two probes two trackg objects and two conditionally announced default routes The second set of configuration commands Example 5-2 is almost the same as the first set Probe 22 defed by the ip sla monitor 22 command defes the test condition for the reachability of the backup ISP destation address .1.1 usg Fast Ethernet 0/1 as the source address The test is every 10 seconds from now to forever Trackg object 2 is related to the second probe as defed by the track 2 rtr 22 reachability command The default route configured via .1.1 is usg a higher admistrative distance of 3 because the backup ISP is to be used only if the primary ISP is not available This default route is offered to the routg table if the result of trackg object 2. Ip route prefix for the destation mask Prefix mask for the destation ip-address IP address of the next hop that can be used to reach that network terface-type terface-number Network terface type and terface number dhcp Open Desktop Download ZIP Launchg GitHub Desktop If nothg happens download GitHub Desktop and. Recommended SDK for bug and crash reportg stabug Graphics Coregraphics CoreAnimation SVG CGContext libraries helpers. Gesture Libraries and tools to handle gestures. How to Use Awesome- is an amazg list for people who need a certa feature on their app so the best ways to. This section exames some of the configuration commands used to defe trackg objects to track the state of IP SLAs operations Use the track object-number ip sla operation-number {state | reachability} global configuration command (or the track object-number rtr operation-number {state | reachability} global configuration command) to track the state of an IP SLAs operation and enter track configuration mode The parameters of these commands are defed Table 5-5 Table 5-5 track ip sla and track rtr Commands Parameter Description The ICMP echo operation is used to cause ICMP echo requests to be sent to a destation to check connectivity Use the icmp-echo {destation-ip-address | destation-hostname} [source-ip {ip-address | hostname} | source-terface terface-name] IP SLA configuration mode command (or the type echo protocol ipIcmpEcho {destation-ip-address | destation-hostname} [source-ipaddr {ip-address | hostname} | source-terface terface-name] rtr configuration mode command) to configure an IP SLAs ICMP echo operation The parameters of these commands are defed Table 5-3 Table 5-3 icmp-echo and type echo protocol ipIcmpEcho Commands Parameter Deployg the Cisco IP SLAs solution the impact of the additional probe traffic beg generated should also be considered cludg how that traffic affects bandwidth utilization and congestion levels Tung the configuration (for example with the delay and frequency commands) becomes critical to mitigate possible issues related to excessive transitions and route changes the presence of flappg tracked objects. Figure 5-5 Cisco IP SLAs Measure Network Performance Because Cisco IP SLAs are accessible usg Simple Network Management Protocol (SNMP) performance-monitorg applications such as CiscoWorks ternetwork Performance Monitor (IPM) and other third-party Cisco partner performance-management products can also use them NOTE For formation about SNMP operation see the SNMP chapter of Cisco's ternetworkg Technology Handbook available at .com/en/US/docs/ternetworkg/technology/handbook . 800 East 6th Street dianapolis. Messagg Also see push notifications The two time stamps taken the IP SLAs responder also allow one-way delay jitter and directional packet loss to be tracked These statistics are critical for understandg asynchronous network behavior To calculate these one-way delay measurements the source and target need to be synchronized to the same clock source and therefore the Network Time Protocol (NTP) must be configured on both Configurg Path Control Usg IP SLAs This section describes some of the commands used to configure path control usg IP SLAs The followg steps are required to configure Cisco IP SLAs functionality:

(Optional) Number of seconds the operation actively collects formation The default is 3600 seconds (1 hour) start-time (Optional) Time when the operation starts hh:mm[:ss] Specifies an absolute start time usg hour mute and (optionally) second Use the 24-hour clock notation For example start time 01:02 means "start at 1:02 a.m " and start time 13:01:30 means "start at 1:01 p.m and 30 seconds." The current day is implied unless you specify a month. See All Related Articles Arkit Library and tools to help you build unparalleled augmented reality experiences