SR OS also supports the option to setup an async-mode Bidirectional Forwarding Detection (BFD) session to a BGP neighbor so that failure of the BFD session can trigger immediate teardown of the BGP session. When BFD is enabled on a BGP session a 1-hop or multi-hop BFD session is setup to the neighbor IP address and the BFD parameters come from the BFD configuration of the interface associated with the local-address; for multi-hop sessions this is typically the system interface. With a 10 ms transmit interval and a multiplier of 3 BFD can detect a peer failure in a period of time as short of 30 ms.