diff options
| author | Sarita Patra <saritap@vmware.com> | 2023-04-09 22:30:44 -0700 |
|---|---|---|
| committer | Mergify <37929162+mergify[bot]@users.noreply.github.com> | 2023-04-13 11:37:38 +0000 |
| commit | 312c97ae18ef6260e8ccbc932a1fd1fc88cbd6fb (patch) | |
| tree | aa31f04984496fee162e6a1c7efd60ccd4169c07 | |
| parent | 25463613552393cce5fbba4a6453947727f14f82 (diff) | |
pimd: Process no-forward BSM packet
Topology Used:
=============
Cisco---FRR4----FRR2
Initially PIM nbr is down between FRR4----FRR2 from FRR2 side
Cisco is sending BSR packet to FRR4.
Problem Statement:
=================
No shutdown the PIM neighbor on FRR2 towards FRR4.
FRR2, receives BSR packet immediately as the new neighbor
comes up. This BSR packet is having no-forward bit set.
FRR2 is not able to process the BSR packet, and drop the
BSR packet.
Root Cause:
==========
When PIMD comes up, we start BSM timer for 60 seconds.
Here, the value accept_nofwd_bsm is setting to false.
FRR2, when receives no-forward BSR packet, it is getting
accept_nofwd_bsm value as false.
So, it drops, the no-forward BSM packet.
Fix:
===
Set accept_nofwd_bsm as false after first BSM packet received.
Signed-off-by: Sarita Patra <saritap@vmware.com>
(cherry picked from commit 8b462d557905200d98c7a8965b3d223637c3c5dd)
| -rw-r--r-- | pimd/pim_bsm.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/pimd/pim_bsm.c b/pimd/pim_bsm.c index 1f7dd2f3f9..9942886b77 100644 --- a/pimd/pim_bsm.c +++ b/pimd/pim_bsm.c @@ -170,7 +170,6 @@ static void pim_on_bs_timer(struct thread *t) pim_nht_bsr_del(scope->pim, scope->current_bsr); /* Reset scope zone data */ - scope->accept_nofwd_bsm = false; scope->state = ACCEPT_ANY; scope->current_bsr = PIMADDR_ANY; scope->current_bsr_prio = 0; @@ -1378,6 +1377,10 @@ int pim_bsm_process(struct interface *ifp, pim_sgaddr *sg, uint8_t *buf, } } + /* BSM packet is seen, so resetting accept_nofwd_bsm to false */ + if (pim->global_scope.accept_nofwd_bsm) + pim->global_scope.accept_nofwd_bsm = false; + if (!pim_addr_cmp(sg->grp, qpim_all_pim_routers_addr)) { /* Multicast BSMs are only accepted if source interface & IP * match RPF towards the BSR's IP address, or they have |