LAG Virtual Anchor Speed
The LAG interface retains the reference operational speed as long as the member port
is up. When the last port goes down, the operational speed is reset. Depending on
the subsequent sequence of ports coming up, the LAG interface reference speed is used.
Since we rely on the first UP port to choose the anchor operational speed, the following behaviors are not avoidable:
- Error-disabled ports may change over a system reload because the anchor operational speed can differ depending on the order in which the links are brought up.
- A similar situation can happen when all LAG member ports go down and the ports are subsequently brought up in a different order.
As these behaviors can affect traffic forwarding
over the LAG, make use of the speed-duplex command available in VLAG interface configuration mode to
force a desired speed value for a LAG. As the speed and duplex mode configuration
will
be persistent over the reload, the LAG ports are error-disabled due to the operational
speed mismatch before and after the reload.