proc StopOspfProtocolNgpfHlt { topologyHandle } {
    puts "StopOspfProtocolNgpfHlt: $topologyHandle ..."
    set status [::ixiangpf::emulation_ospf_control \
		    -handle $topologyHandle \
		    -mode stop \
		   ]
    if {[keylget status status] != $::SUCCESS} {
	puts "\nError StartOspfProtocolNgpfHlt: $status\n"
	return 1
    }
    return 0
}