help: OSPF SPF timers
delete:expression: "touch /tmp/ospf-timer.$PPID"
end:expression: "if [ -f \"/tmp/ospf-timer.$PPID\" ]; then \
         ${vyatta_sbindir}/vyatta-vtysh.pl -c \"configure terminal\" -c \"router ospf\" \
         -c \"no timers throttle spf\"; \
         rm /tmp/ospf-timer.$PPID; \
     else \
         ${vyatta_sbindir}/vyatta-vtysh.pl -c \"configure terminal\" -c \"router ospf\" \
         -c \"timers throttle spf $VAR(delay/@) $VAR(initial-holdtime/@) $VAR(max-holdtime/@)\"; \
     fi; "
