2.9.5.1 Remote Inhibition/Uninhibition of Link

The Remote Inhibit functionality inhibits or uninhibits the Link from far end. This feature is mainly used for maintenance purpose.

The traffic is not routed through an inhibit link. When inhibit message (LIN) is received on vSTP, the link becomes unavailable on MTP3 layer. There is no link state change on MTP2 layer. vSTP sends LIA as acknowledgment for LIN message, confirming that the link is inhibit.

When uninhibit message (LUN) is received on vSTP, the link becomes available on MTP 3 layer. vSTP sends LUA as acknowledgment of LUN message to confirm that the link is uninhibit and the traffic can be routed through that same link.