Of course, due to the endless; not important all devices in your network have synchronized time and said the network time Protocol (NTP) is the right technology.
Network time protocol, as defined in RFC958 provides a method to get the date and time via the Internet, with several variables are taken into account such as latency and delay so as to ensure the most precise synchronization equipment.
Today's network using the new and approved standard NTPv3 (network time protocol version 3). In a nutshell NTP uses User Datagram Protocol (UDP) on port 123, and indeed one of the most ancient agreement on use of the Internet is today. NTP by Dave · Designed by Mills at the University of Delaware and is still maintained by the team of David and selected volunteers.
Network time protocol is based on a hierarchical model is called clock stratum is short for stratum, "a layer of the series" in Latin meaning.
Cisco device while in use, you will be able to configure through with 1 is the most credible source, and least 15 15 15 layers of. Most Cisco devices in a joint deployment is a class 4 or a later version as the Atomic (caesium, rubidium) clock is a stratum 0 to stratum 1 devices are usually connected directly via serial interface. Stratum 2 device under review such as "time server" queries on their time from stratum 1 device and provides stratum 3 devices, typically reside on the local area network as the local time of the server's time. NTP server can query other NTP servers, as long as they are in the same stratigraphic layer in, you may receive this error, ensure that the most accurate time synchronization. Stratum 4 devices from a properly designed network LAN time server was stratum 3 retrieve their time.
One bit of information, really have to bear in mind that NTP, save yourself a lot of frustration and headaches is a NTP client is not to when dealing with an earlier date-time server synchronization.
Good, then moaned and rattled enough and lets get down to business. On the Cisco device Configure NTP client will use the NTP Server x.x.x.x command in global configuration. You can specify multiple NTP servers, if you have multiple servers in your network; this ensures that NTP redundant Cisco equipment if failure one still gets the time from a server. However captured this configuration is processed but from top to bottom in the configuration of the server, but using the x.x.x.x command NTP server you have specified "preferred server" like capabilities.
Cisco devices is another way to configure the NTP server using NTP peer x.x.x.x command in global configuration. This command will allow you to use multiple NTP servers, and servers in a peer group is the lowest class will be the most accurate NTP server peer groups.
To verify your Cisco device through NTP you will need to use the show NTP associations, will show you the current NTP peer devices and other information including the NTP reference clock, #, on its formation in the polling interval, arrival, delays and offsets.
In this lab, you will configure the R2 as a preferred NTP server NTP client query the time from R1. In the laboratory this laboratory R1 is configured as stratum 3 NTP Server. goal 2. ----In each router its own OSPF area configuration Loopback0 interface, using a new OSPF area number of routers.
Lab Instruction:
Step 1: Time and date configured on R1 as of January 1, 2005, to ensure that the configuration is different
then real time demo of NTP time.
Step 2: Configure R2 to use the NTP server located at 10.117.12.1.
Step 3: Verity R2 from R1 has been by looking at the local clock and NTP Association by NTP for the correct time and date.
As shown above the show NTP command you will see the server 10.117.12.1 the Association is the primary (sync) server, such as a *. Once you can confirm how long does the clock via NTP synchronization.
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