Motorola WiNG 4.4 Reference Manual page 22

1 - 6 WiNG 4.4 Switch System Reference Guide
1.2.1.6 Process Monitor
The switch Process Monitor checks to ensure processes under its control are up and running. Each monitored process
sends periodic heartbeat messages. A process that is down (due to a software crash or stuck in an endless loop) is
detected when its heartbeat is not received. Such a process is terminated (if still running) and restarted (if configured) by
the Process Monitor.
1.2.1.7 Hardware Abstraction Layer and Drivers
The Hardware Abstraction Layer (
data. Drivers include platform specific components such as Ethernet, Flash Memory storage and thermal sensors.
1.2.1.8 Redundancy
Using switch redundancy, up to 12 switches can be configured in a redundancy group (and provide group monitoring). In
the event of a switch failure, an existing cluster member assumes control. Therefore, the switch supported network is
always up and running even if a switch fails or is removed for maintenance or a software upgrade.
The following redundancy features are supported:
• Up to 12 switch redundancy members are supported in a single group. Each member is capable of tracking statistics
for the entire group in addition to their own.
• Each redundancy group is capable of supporting an Active/Active configuration responsible for group load sharing.
• Members within the same redundancy group can be deployed across different subnets.
• APs are load balanced across members of the group.
• Licenses are aggregated across the group. When a new member joins the group, the new member can leverage the
Access Port adoption license(s) of existing members.
• Each member of the redundancy group (including the reporting switch) is capable of displaying cluster performance
statistics for all members in addition to their own.
• Centralized redundancy group management using the switch CLI.
For more information on configuring the switch for redundancy support, see
Configuring Switch Redundancy & Clustering on page
1.2.1.9 Secure Network Time Protocol (SNTP)
Secure Network Time Protocol (SNTP) manages time and/or network clock synchronization within the switch managed
network. SNTP is a client/server implementation. The switch (a SNTP client) periodically synchronizes its clock with a
master clock (an NTP server). For example, the switch resets its clock to 07:04:59 upon reading a time of 07:04:59 from its
designated NTP server. Time synchronization is recommended for the switch's network operations. The following holds
true:
• The switch can be configured to provide NTP services to NTP clients.
• The switch can provide NTP support for user authentication.
• Secure Network Time Protocol (SNTP) clients can be configured to synchronize switch time with an external NTP server.
For information on configuring the switch to support SNTP, see
1.2.1.10 Password Recovery
The access point has a means of restoring its password to its default value. Doing so also reverts the access point's
security, radio and power management configuration to their default settings. Only an installation professional should
reset the access point's password and promptly define a new restrictive password.
HAL)
provides an abstraction library with an interface hiding hardware/platform specific
5-34.
Configuring Secure NTP on page 5-23.