420 IBM z13s Technical Guide
Requirements
ECAR is only available on z13 Driver 27 and z13s servers. In a mixed environment with
previous generation machines, you should define a z13 or z13s server as the PTS and CTS.
For more planning and setup information, see the following publications:
Server Time Protocol Planning Guide, SG24-7280
Server Time Protocol Implementation Guide, SG24-7281
Server Time Protocol Recovery Guide, SG24-7380
11.5.9 NTP client and server support on the HMC
The NTP client support allows a STP-only CTN to use an NTP server as an external time
source (ETS).
This capability addresses the following requirements:
Clients who want time accuracy for the STP-only CTN
Clients who use a common time reference across heterogeneous systems
The NTP server becomes the single time source, the ETS, for STP and other servers that are
not z Systems (such as AIX, Microsoft Windows, and others) that have NTP clients.
The HMC can act as an NTP server. With this support, the z13s server can get time from the
HMC without accessing a LAN other than the HMC/SE network. When the HMC is used as an
NTP server, it can be configured to get the NTP source from the Internet. For this type of
configuration, a LAN that is separate from the HMC/SE LAN can be used.
HMC NTP broadband authentication support
HMC NTP authentication can be used since HMC Driver 15. The SE NTP support is
unchanged. To use this option on the SE, configure the HMC with this option as an NTP
server for the SE.
Authentication support with a proxy
Some client configurations use a proxy for external access outside the corporate data center.
NTP requests are User Datagram Protocol (UDP) socket packets and cannot pass through
the proxy. The proxy must be configured as an NTP server to get to target servers on the web.
Authentication can be set up on the client’s proxy to communicate with the target time
sources.
Authentication support with a firewall
If you use a firewall, HMC NTP requests can pass through it. Use HMC authentication to
ensure untampered time stamps.
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