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Pimd : S,G Mroute entries are not expiring even after KAT expiry,

Browse Source 
become stale entries.

Topology:
--------
Source
|
FHR
|
RP ------ LHR --- Recv1
|
Recv2

Root case :
-----------
When RP acts as a LHR i.e RP has a local receiver and registed for
the same group where LHR connected receiver also registered for the
same multicast group.When RP receives a (s,g) join form LHR , it
increments upstream ref count to two to track the Local membership
as well.But at the time of KAT expiry in RP , upstream reference
is not being removed Which is added to track local membership which
is causing to make these entries as stale in RP and FHR.

Fix : Made the change such that it removes the upstream reference
if it is added to track the local memberships.

Signed-off-by: Rajesh Girada <rgirada@vmware.com>
This commit is contained in:
rgirada 2019-05-03 10:35:48 -07:00
parent 43932ad63c
commit e3e532dd16
1 changed files with 10 additions and 2 deletions
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12
pimd/pim_upstream.c
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@ -1181,8 +1181,16 @@ struct pim_upstream *pim_upstream_keep_alive_timer_proc(
"kat expired on %s[%s]; remove stream reference",
up->sg_str, pim->vrf->name);
PIM_UPSTREAM_FLAG_UNSET_SRC_STREAM(up->flags);
up = pim_upstream_del(pim, up, __PRETTY_FUNCTION__);
} else if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(up->flags)) {
/* Return if upstream entry got deleted.*/
if (!pim_upstream_del(pim, up, __PRETTY_FUNCTION__))
return NULL;
}
/* upstream reference would have been added to track the local
* membership if it is LHR. We have to clear it when KAT expires.
* Otherwise would result in stale entry with uncleared ref count.
*/
if (PIM_UPSTREAM_FLAG_TEST_SRC_LHR(up->flags)) {
struct pim_upstream *parent = up->parent;
PIM_UPSTREAM_FLAG_UNSET_SRC_LHR(up->flags);