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Manual Cisco Systems SMC-169

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  • Cisco Systems SMC-169 - page 1

    SMC-169 Cisco IOS XR System Management Configuration Guide Implementing NTP on Cisco IOS XR Software Network T ime Protocol (NTP) is a protocol designed to time-synchronize de vices within a network. The Cisco IOS XR software implements NTPv4. NTPv4 retains backwards compatibility with the older versions of NTP , including NTPv3 and NTPv2 but e xcl ...

  • Cisco Systems SMC-169 - page 2

    Implementing NTP on Cisco IOS XR Software Prerequisites for Implementing NTP on Cisco IOS XR Software SMC-170 Cisco IOS XR System Management Configuration Guide Prerequisites for Implementing NTP on Cisco IOS XR Software The follo wing prerequisites are required to implement NTP in your network operating center (NOC): • Y ou must be in a user gro ...

  • Cisco Systems SMC-169 - page 3

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-171 Cisco IOS XR System Management Configuration Guide The communications between machines running NTP (known as “associations”) are usually statically conf igured; each machine is giv en the IP address of all machines with which it should form associati ...

  • Cisco Systems SMC-169 - page 4

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-172 Cisco IOS XR System Management Configuration Guide The follo wing are two most commonly used, poll-based association modes: • Client mode • Symmetric acti ve mode The client and the symmetric active modes should be used when NTP is required to provid ...

  • Cisco Systems SMC-169 - page 5

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-173 Cisco IOS XR System Management Configuration Guide Configuring Broadcast-Based NTP Associations This task explains ho w to conf igure broadcast-based NTP associations. Note No specif ic command enables NTP; the f irst NTP conf iguration command that you ...

  • Cisco Systems SMC-169 - page 6

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-174 Cisco IOS XR System Management Configuration Guide When a networking de vice is operating in the br oadcastclient mode , it does not engage in any polling. Instead, it listens for NTP broadcast packets transmitted by broadcast time serv ers. Consequently ...

  • Cisco Systems SMC-169 - page 7

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-175 Cisco IOS XR System Management Configuration Guide Configuring NTP Access Groups This task explains ho w to conf igure NTP access groups. Note No specif ic command enables NTP; the f irst NTP conf iguration command that you issue enables NTP . NTP Access ...

  • Cisco Systems SMC-169 - page 8

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-176 Cisco IOS XR System Management Configuration Guide If the source IP address matches the access lists for more than one access type, the f irst type is granted. If no access groups are specif ied, all access types are granted to all systems. If any access ...

  • Cisco Systems SMC-169 - page 9

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-177 Cisco IOS XR System Management Configuration Guide Step 3 access-group { peer | query-only | serve | serve-only } access-list-name Example: RP/0/RP0/CPU0:router(config-ntp)# access-group peer access1 Creates an access group and applies a basic IP access ...

  • Cisco Systems SMC-169 - page 10

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-178 Cisco IOS XR System Management Configuration Guide Configuring NTP Authentication This task explains ho w to conf igure NTP authentication. Note No specif ic command enables NTP; the f irst NTP conf iguration command that you issue enables NTP . NTP Auth ...

  • Cisco Systems SMC-169 - page 11

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-179 Cisco IOS XR System Management Configuration Guide DETAILED STEPS Command or Action Purpose Step 1 configure Example: RP/0/RP0/CPU0:router# configure Enters global conf iguration mode. Step 2 ntp Example: RP/0/RP0/CPU0:router(config)# ntp Enters NTP conf ...

  • Cisco Systems SMC-169 - page 12

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-180 Cisco IOS XR System Management Configuration Guide Disabling NTP Services on a Specific Interface This task explains ho w to disable NTP services on a specif ic interface. NTP services are disabled on all interfaces by default. NTP is enabled globally wh ...

  • Cisco Systems SMC-169 - page 13

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-181 Cisco IOS XR System Management Configuration Guide Step 3 no interface type instance or interface type instance disable Example: RP/0/RP0/CPU0:router(config-ntp)# no interface pos 0/0/0/1 or RP/0/RP0/CPU0:router(config-ntp)# interface POS 0/0/0/1 disable ...

  • Cisco Systems SMC-169 - page 14

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-182 Cisco IOS XR System Management Configuration Guide Configuring the Source IP Address for NTP Packets This task explains ho w conf igure the source IP address for NTP packets. When the system sends an NTP packet, the source IP address is normally set to t ...

  • Cisco Systems SMC-169 - page 15

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-183 Cisco IOS XR System Management Configuration Guide Step 3 source interface-type interface-instance Example: RP/0/RP0/CPU0:router(config-ntp)# source POS 0/0/0/1 Conf igures an interface from which the IP source address will be taken. Note This interface ...

  • Cisco Systems SMC-169 - page 16

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-184 Cisco IOS XR System Management Configuration Guide Configuring the System as an Authoritative NTP Server This task explains ho w to conf igure the router as an authoritati ve NTP server . Y ou can conf igure the router to act as an authoritativ e NTP ser ...

  • Cisco Systems SMC-169 - page 17

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-185 Cisco IOS XR System Management Configuration Guide Updating the Hardware Clock This task explains ho w to conf igure the hardware clock to be periodically updated from the software clock running NTP . On de vices that have hardw are clocks (system calend ...

  • Cisco Systems SMC-169 - page 18

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-186 Cisco IOS XR System Management Configuration Guide SUMMARY STEPS 1. conf igure 2. ntp 3. update-calendar 4. end or commit DETAILED STEPS Command or Action Purpose Step 1 configure Example: RP/0/RP0/CPU0:router# configure Enters global conf iguration mode ...

  • Cisco Systems SMC-169 - page 19

    Implementing NTP on Cisco IOS XR Software How to Implement NTP on Cisco IOS XR Software SMC-187 Cisco IOS XR System Management Configuration Guide Verifying the Status of the External Reference Clock This task explains ho w to verify the status of NTP components. Note The commands can be entered in any order . SUMMARY STEPS 1. show ntp associations ...

  • Cisco Systems SMC-169 - page 20

    Implementing NTP on Cisco IOS XR Software Configuration Examples for Implementing NTP on Cisco IOS XR Software SMC-188 Cisco IOS XR System Management Configuration Guide Configuration Examples for Implementing NTP on Cisco IOS XR Software This section contains the following e xamples: • Conf iguring Poll-Based Associations: Example, page SMC-188 ...

  • Cisco Systems SMC-169 - page 21

    Implementing NTP on Cisco IOS XR Software Configuration Examples for Implementing NTP on Cisco IOS XR Software SMC-189 Cisco IOS XR System Management Configuration Guide Configuring NTP Access Groups: Example The following e xample shows a NTP access group conf iguration where the following access group restrictions are applied: • Peer restrictio ...

  • Cisco Systems SMC-169 - page 22

    Implementing NTP on Cisco IOS XR Software Configuration Examples for Implementing NTP on Cisco IOS XR Software SMC-190 Cisco IOS XR System Management Configuration Guide • The router is conf igured to synchronize only to systems providing authentication k ey 3 in their NTP packets. ! ntp authentication-key 2 md5 encrypted 06120A2D40031D10081240 a ...

  • Cisco Systems SMC-169 - page 23

    Implementing NTP on Cisco IOS XR Software Additional References SMC-191 Cisco IOS XR System Management Configuration Guide Updating the Hardware Clock: Example The following e xample shows an NTP conf iguration in which the router is conf igured to update its hardware clock from the software clock at periodic interv als: ! ntp server 10.3.32.154 ma ...

  • Cisco Systems SMC-169 - page 24

    Implementing NTP on Cisco IOS XR Software Additional References SMC-192 Cisco IOS XR System Management Configuration Guide RFCs Technical Assistance RFCs T itle RFC 1305 Network T ime Protocol, V ersion 3: Specif ication, Implementation, and Analysis RFC 1119 Network T ime Protocol, V ersion 2: Specif ication and Implementation RFC 1059 Network T i ...

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Documents that we receive from a manufacturer of a Cisco Systems SMC-169 can be divided into several groups. They are, among others:
- Cisco Systems technical drawings
- SMC-169 manuals
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All of them are important, but the most important information from the point of view of use of the device are in the user manual Cisco Systems SMC-169.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Cisco Systems SMC-169, service manual, brief instructions and user manuals Cisco Systems SMC-169. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Cisco Systems SMC-169.

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A complete manual for the device Cisco Systems SMC-169, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Cisco Systems SMC-169 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Cisco Systems SMC-169.

A complete Cisco Systems manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Cisco Systems SMC-169 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Cisco Systems SMC-169, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Cisco Systems SMC-169, that we can find in the current document
3. Tips how to use the basic functions of the device Cisco Systems SMC-169 - which should help us in our first steps of using Cisco Systems SMC-169
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Cisco Systems SMC-169
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Cisco Systems SMC-169 in a specific country, if it was not possible to solve the problem on our own.

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