TWAMP: Bypass hash-based load balancing for sending test probes over a LAG member

By default, TWAMP test probes are distributed across LAG members using hash-based load balancing. With this feature, you can override that behavior in either of two ways:

• Configure MPLS with a static LSP on the LAG interface, for both forward and return paths, to ensure probes follow a fixed path.
• Configure segment routing on the LAG interface to explicitly select a specific LAG member for the forward and return paths.