Specifications

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Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 7 Switch Operating Procedures
Managing Network Clock Sources
In an SNTP server/client configuration, the SNTP client periodically receives TOD requests from the
primary server. If the primary server is not available for some reason, the SNTP client switches over the
next available secondary server for TOD information until the primary server comes back up.
An SNTP server can reside on an active PXM in an MGX and in and SES switch. The primary server
can reside on an MGX switch, and the secondary server or servers reside on the SES, or vice-versa. For
instructions on setting up an SNTP server on an SES switch, refer to the SES PNNI Controller Software
Configuration Guide, Release 3.0.
To set synchronize network clocks, you need to perform the following task in order:
1. Set up a primary server for the network client.
2. Set up a secondary server (or several secondary servers), which serves as a backup server if the
SNTP client cannot reach the primary server.
3. Configure the network client.
Note To synchronize the primary and secondary servers, the SNTP client must be enabled on the node or nodes
on which the servers are running.
Use the following procedure to set up TOD synchronization in your network.
Note SNTP clients and servers run only on active PXM cards.
Step 1 Select a primary server that is able to provide reliable TOD information to the network.
Step 2 At the PXM45 prompt, enter the cnfsntp -server on -stratum <stratum level > command to enable the
server and configure the stratum level. Replace <stratum level > with the stratum level for the server.
M8850_LA.8.PXM.a > cnfsntp -server on -stratum 1
Step 3 Select a secondary server and log in to the active PXM45 card on the switch where your secondary server
will reside.
Step 4 At the PXM45 prompt, enter the addsntprmtsvr <options> command to set up the connection to the
primary server.
M8850_LA.8.PXM.a > addsntprmtsvr <server IP address> -version <version> -primary yes
Replace <server IP address> with the primary servers IP address.
Table 7-10 describes the addsntprmtsvr command parameters.
Table 7-10 addsntprmtsvr Command Parameters
Parameter Description
server IP address Server’s IP Address in dotted decimal format.
version Sets the SNTP version number.
primary Determines whether the server is primary or secondary. Enter yes for
primary, or no for secondary. The default is no.