Commit 100% working part of patch from Laurent Rabret ([quagga-dev 830]).
Also tiny temporary fix from me to spf thread crash. Will look at it later.
diff --git a/isisd/isis_constants.h b/isisd/isis_constants.h
index 852b8a1..c732bfc 100644
--- a/isisd/isis_constants.h
+++ b/isisd/isis_constants.h
@@ -65,7 +65,7 @@
#define ISIS_LEVEL1 1
#define ISIS_LEVEL2 2
-#define HELLO_INTERVAL 1
+#define HELLO_INTERVAL 10
#define HELLO_MINIMAL HELLO_INTERVAL
#define HELLO_MULTIPLIER 3
#define DEFAULT_PRIORITY 64