If the system exhausts an ILM, NHLFE, or any other IOM or CPM resource while resolving and programming a received prefix SID or programming a local adjacency SID, the following occurs.
The IGP instance goes into overload and a trap and syslog error message are generated.
The segment routing module deletes the tunnel.
The user must manually clear the IGP overload condition after freeing resources. After the IGP is brought back up, it attempts to program at the next SPF all tunnels which previously failed the programming operation.