Priority-based designated interface selection in a link aggregation group

A non-transitory machine-readable storage medium comprising instructions that upon execution cause a first time clock to:

• select, from a plurality of interfaces based on priorities associated with the plurality of interfaces, an initial designated interface to use for a time synchronization process;
• send, using the initial designated interface, a first timing message of the time synchronization process to a second time clock to which the first time clock is to be synchronized according to the time synchronization process;
• based on receiving, from the second time clock, a second timing message at a non-designated interface of the first time clock wherein the non-designated interface is different from the initial designated interface, change a designated interface selection by selecting the non-designated interface as a new designated interface;
• and
• determine, based on the first timing message, that the first time clock is a clock sink and the second time clock is a clock source on the initial designated interface,
• wherein the changing of the designated interface selection is responsive to the determination that the first time clock is the clock sink.

A method comprising:

• selecting, by a first time clock from a plurality of logical aggregation group (LAG) interfaces of a first electronic device based on priorities associated with the plurality of LAG interfaces, an initial designated LAG interface to use for a time synchronization process between the first time clock and a second time clock in a second electronic device;
• sending, using the initial designated LAG interface, a first announce message of the time synchronization process from the first time clock to the second time clock;
• receiving, at the first time clock from the second time clock, a second announce message of the time synchronization process;
• determining, based on the first and second announce messages, whether the first time clock is a clock sink on the initial designated LAG interface;
• and
• based on a determination that the first time clock is the clock sink on the initial designated LAG interface:
• determining, by the first time clock, whether a synchronization message from the second time clock is received at the initial designated LAG interface,
• based on a determination that the synchronization message from the second time clock is received at a non-designated LAG interface different from the initial designated LAG interface, changing, by the first time clock, a designated LAG interface selection by selecting the non-designated LAG interface as a new designated LAG interface, and
• performing, by the first time clock, a remainder of the time synchronization process using the new designated LAG interface.