If the NTP server/peer is configured without authentication keys, the NTP request is not sent to the
configured server/peer.
NOTE
The same set or subset of key id and key string should be installed on all NTP devices.
VLAN and NTP
When VLAN is configured,
• NTP time servers should be reachable through the interfaces which belong to the configured VLAN.
Otherwise, NTP packets are not transmitted. This is applicable to both the unicast and the broadcast
server/client.
• NTP broadcast packets are sent only on the interface which belongs to the configured VLAN.
• The received unicast or broadcast NTP packet are dropped if the interface on which packet has been
received does not belong to the configured VLAN
Configuring NTP
NTP services are disabled on all interfaces by default.
Prerequisites:
• Before you begin to configure NTP, you must use the clock set command to set the time on your
device to within 1000 seconds of the coordinated Universal Time (UTC).
• Disable SNTP by removing all the SNTP configurations.
Enabling NTP
NTP and SNTP implementations cannot operate simultaneously. By default, SNTP is enabled. To
disable SNTP and enable NTP, use the ntp command in configuration mode. This command enables
the NTP client and server mode if SNTP is disabled.
Brocade(config)# ntp
Brocade(config-ntp)#
Syntax: [no] ntp
Use the no form of the command to disable NTP and remove the NTP configuration.
NOTE
The no ntp command removes all the configuration which are configured statistically and learned
associations from NTP neighbors.
NOTE
You cannot configure the ntp command if SNTP is enabled. If SNTP is enabled, configuring the ntp
command will display the following message:"SNTP is enabled. Disable SNTP before using NTP for
time synchronization"
VLAN and NTP
FastIron Ethernet Switch Administration Guide 43
53-1003625-01
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