ospfd: Fast OSPF convergence

When considering small networks that have extreme requirements on
availability and thus convergence delay, the timers given in the OSPF RFC
seem a little “conservative”, i.e., the delay between accepted LSAs and the
rate at which LSAs are sent.  Cisco introduced two commands 'timers throttle
lsa all’ and 'timers lsa arrival’, which allow operators to tune these
parameters.

I have been writing a patch to also support 'timers lsa arrival’ fully and
‘timers throttle lsa all’ (without the throttling part) also in quagga.
diff --git a/ospfd/ospf_lsa.h b/ospfd/ospf_lsa.h
index c71877d..dd3b91a 100644
--- a/ospfd/ospf_lsa.h
+++ b/ospfd/ospf_lsa.h
@@ -237,6 +237,7 @@
 extern int tv_ceil (struct timeval);
 extern int tv_floor (struct timeval);
 extern struct timeval int2tv (int);
+extern struct timeval msec2tv (int);
 extern struct timeval tv_add (struct timeval, struct timeval);
 extern struct timeval tv_sub (struct timeval, struct timeval);
 extern int tv_cmp (struct timeval, struct timeval);