Using The Simple Network Time Protocol; Configuring And Using Sntp - Extreme Networks Summit 200-24 Installation And User Manual

Managing the Switch
Table 22: EAPOL Flooding Configuration Commands
Command
disable eapol-flooding
enable eapol-flooding
show eapol-flooding

Using the Simple Network Time Protocol

ExtremeWare supports the client portion of the Simple Network Time Protocol (SNTP) Version 3 based
on RFC1769. SNTP can be used by the switch to update and synchronize its internal clock from a
Simple Network Time Protocol server. When enabled, the switch sends out a periodic query to the
indicated SNTP server, or the switch listens to broadcast SNTP updates. In addition, the switch supports
the configured setting for Greenwich Mean time (GMT) offset and the use of Daylight Savings Time.
These features have been tested for year 2000 compliance.

Configuring and Using SNTP

To use SNTP, follow these steps:
1 Identify the host(s) that are configured as SNTP server(s). Additionally, identify the preferred
method for obtaining SNTP updates. The options are for the SNTP server to send out broadcasts, or
for switches using SNTP to query the SNTP server(s) directly. A combination of both methods is
possible. You must identify the method that should be used for the switch being configured.
2 Configure the Greenwich Mean Time (GMT) offset and Daylight Savings Time preference. The
command syntax to configure GMT offset and usage of Daylight Savings is as follows:
config timezone <GMT_offset> {autodst | noautodst}
The GMT_OFFSET is in +/- minutes from the GMT time. Automatic Daylight Savings Time (DST)
changes can be enabled or disabled. The default setting is enabled.
3 Enable the SNTP client using the following command:
enable sntp-client
Once enabled, the switch sends out a periodic query to the SNTP servers defined later (if configured)
or listens to broadcast SNTP updates from the network. The network time information is
automatically saved into the on-board real-time clock.
4 If you would like this switch to use a directed query to the SNTP server, configure the switch to use
the SNTP server(s). If the switch listens to SNTP broadcasts, skip this step. To configure the switch to
use a directed query, use the following command:
config sntp-client [primary | secondary] server [<ip_address> | <hostname>]
NTP queries are first sent to the primary server. If the primary server does not respond within 1
second, or if it is not synchronized, the switch queries the secondary server (if one is configured). If
the switch cannot obtain the time, it restarts the query process; otherwise, the switch waits for the
sntp-client update interval
72
Description
Disables EAPOL flooding on the switch.
Enables EAPOL flooding on the switch.
Enables network login on a specified port in a VLAN.
before querying again.
Summit 200 Series Switch Installation and User Guide