pimd: Add a debug to tell why we are not creating upsteam state

When we decide we are not the right pim process to add upstream state
for the igmp state received, notice this in a debug to make life
easier to debug.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

diff --git a/pimd/pim_zebra.c b/pimd/pim_zebra.c
index 4fa4ea857fed7af63b5122dfb855b680cdf2cd70..4ff9bd6bdc65863519ecf89c723fa9f479aca068 100644 (file)
--- a/pimd/pim_zebra.c
+++ b/pimd/pim_zebra.c
@@ -1044,9 +1044,14 @@ void igmp_source_forward_start(struct pim_instance *pim,
                return;
        }
 
-       if (!(PIM_I_am_DR(pim_oif)))
+       if (!(PIM_I_am_DR(pim_oif))) {
+               if (PIM_DEBUG_IGMP_TRACE)
+                       zlog_debug("%s: %s was received on %s interface but we are not DR for that interface",
+                                  __PRETTY_FUNCTION__,
+                                  pim_str_sg_dump(&sg),
+                                  group->group_igmp_sock->interface->name);
                return;
-
+       }
        /*
          Feed IGMPv3-gathered local membership information into PIM
          per-interface (S,G) state.