System Management Parameters
238 Basic System Configuration Guide
The following NTP elements are supported:
• Server mode — In this mode, the node advertises the ability to act as a clock source
for other network elements. In this mode, the node will, by default, transmit NTP
packets in NTP version 4 mode.
• Authentication keys — Increased security support in carrier and other network has
been implemented. Both DES and MD5 authentication are supported as well as
multiple keys.
• Operation in symmetric active mode — This capability requires that NTP be
synchronized with a specific node that is considered more trustworthy or accurate
than other nodes carrying NTP in the system. This mode requires that a specific peer
is set.
• Server and peer addressing using IPv6 — Both external servers and external peers
may be defined using IPv6 or IPv4 addresses. Other features (such as multicast,
broadcast) use IPv4 addressing only.
• Broadcast or multicast modes — When operating in these modes, the node will
receive or send using either a multicast (default 224.0.1.1) or a broadcast address.
Multicast is supported on the MGMT port.
• Alert when NTP server is not available — When none of the configured servers are
reachable on the node, the system reverts to manual timekeeping and issues a critical
alarm. When a server becomes available, a trap is issued indicating that standard
operation has resumed.
• NTP and SNTP — If both NTP and SNTP are enabled on the node, then SNTP
transitions to an operationally down state. If NTP is removed from the configuration
or shut down, then SNTP resumes an operationally up state.
• Gradual clock adjustment — As several applications (such as Service Assurance
Agent (SAA)) can use the clock, and if determined that a major (128 ms or more)
adjustment needs to be performed, the adjustment is performed by programmatically
stepping the clock. If a minor (less than 128 ms) adjustment must be performed, then
the adjustment is performed by either speeding up or slowing down the clock.
• In order to avoid the generation of too many events/trap the NTP module will rate
limit the generation of events/traps to three per second. At that point a single trap will
be generated that indicates that event/trap squashing is taking place.
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