NTP VRRP Virtual IP support

This feature allows switches to configure the VRRP virtual IP as an NTP server address. The NTP server, when configured on the VRRP master, listens on the actual IP and virtual IP address for NTP clients.

On the VRRP backup node, only one socket is opened and bound to the physical IP address alone. Once a node transitions to the VRRP master, the ExtremeXOS software re-triggers a listen on the interface to ntpd for it to open a socket and bind to the VRRP VIP.

A flag configuration is added for the IPv4 cases, and these are propagated to VLAN Manager clients. NTP uses this to trigger a listen on the interface. For the master node to process non-ping packets destined to the VIP, the software already has a configuration command in VRRP (accept-mode on/off).


If you want to configure VRRP VIP as the server address on NTP clients, enable accept mode.


The following limitations exist for NTP VRRP Virtual IP support: