When configuring NTP the node can be configured to transmit or receive multicast packets on the CPM MGMT port (CPM applies to the 7450 ESS and 7750 SR). Broadcast and multicast messages can easily be spoofed, therefore, authentication is strongly recommended. Multicast is used to configure the transmission of NTP multicast messages. The no form of this command removes the transmission of multicast packets on the management port.
When transmitting multicast NTP messages the default address of 224.0.1.1 is used.
config>system>time>ntp
— multicast [version version] [key-id key-id]
config>system>time>ntp#
— config>system>time>ntp# multicast
— config>system>time>ntp# no shutdown
The following example shows NTP enabled with the multicast command configured.
A:ALA-12>config>system>time# info
----------------------------------------------
server 192.168.15.221
multicast
no shutdown
----------------------------------------------
A:ALA-12>config>system>time#