[LU-11664] LNet Router: push updates when router interfaces change

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0
• Labels: lnet-health lnet-router
• Assignee: Amir Shehata (Inactive)
• Reporter: Amir Shehata (Inactive)

Description

A router can bring up/down its interfaces if it hasn't received any messages on that interface for a configurable period (alive_router_ping_timeout). When this even occures the router can now push its status change to the peers it's talking to in order to inform them of the change in its status. This will allow the router users to handle asym router failures quicker.