Cisco AS5800 Specifications download pdf (Page 142)

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Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide

DOC-7810814=

Chapter 4 Administration

Enabling Management Protocols: NTP, SNMP, and Syslog

An NTP enabled network usually gets its time from an authoritative time source, such as a Cisco router,

radio clock, or an atomic clock attached to a timeserver. NTP then distributes this time across the

network. NTP is extremely efficient; no more than one packet per minute is necessary to synchronize

two machines to within a millisecond of each another. NTP runs over UDP, which in turn runs over IP.

Step 1 Locate an authoritative clock source. For example, you can use a Cisco router or an atomic clock that is

attached to a time server.

Step 2 Specify the primary NTP server IP address and automatic calendar updates as shown below:

ntp update-calendar

ntp server 172.22.66.18 prefer

Step 3 Verify that the clock is synchronized to the NTP server. Inspect the status and time association.

Clock sources are identified by their stratum levels. The following example shows a stratum level five

clock.

5800-NAS# show ntp status

Clock is synchronized, stratum 5, reference is 172.22.66.18

nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**24

reference time is BB944312.4451C9E7 (23:11:30.266 PDT Wed Sep 22 1999)

clock offset is 0.5343 msec, root delay is 13.26 msec

root dispersion is 18.02 msec, peer dispersion is 0.09 msec

5800-NAS#

The following command identifies how often the NAS is polling and updating to the stratum clock.

An asterisk (*) next to the NTP servers IP address indicates successful synchronization with the stratum

clock.

5800-NAS# show ntp association

address ref clock st when poll reach delay offset disp

*~172.22.66.18 172.60.8.1 16 46 64 377 1.0 0.53 0.1

* master (synced), # master (unsynced), + selected, - candidate, ~ configured

5800-NAS#

Enabling Syslog

The Cisco IOS software can send syslog messages to one or more element manager servers. Syslog

messages are then collected by a standard UNIX or NT type syslog daemon.

Syslog enables you to:

• Centrally log and analyze configuration events and system error messages such as interface status,

security alerts, environmental conditions, and CPU process overloads.

• Capture client debug output sessions in a real-time scenario.

• Reserve Telnet sessions for making configurations changes and using show commands.

This prevents Telnet sessions from getting cluttered up with debug output.

Figure 4-2 shows the Cisco IOS software sending syslog data to an element manager. Syslog data either

stays in the Cisco IOS software buffer, or is pushed out and written to the element managers hard disk.

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