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-rw-r--r--src/vnet/l2/l2_learn.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/vnet/l2/l2_learn.c b/src/vnet/l2/l2_learn.c
index 066bb54fe2e..fddab82426c 100644
--- a/src/vnet/l2/l2_learn.c
+++ b/src/vnet/l2/l2_learn.c
@@ -126,7 +126,7 @@ l2learn_process (vlib_node_runtime_t * node,
/* Entry in L2FIB with matching sw_if_index matched - normal fast path */
u32 dtime = timestamp - result0->fields.timestamp;
u32 dsn = result0->fields.sn.as_u16 - vnet_buffer (b0)->l2.l2fib_sn;
- u32 check = dtime | dsn;
+ u32 check = (dtime && vnet_buffer (b0)->l2.bd_age) || dsn;
if (PREDICT_TRUE (check == 0))
return; /* MAC entry up to date */
@@ -136,8 +136,9 @@ l2learn_process (vlib_node_runtime_t * node,
return; /* Above learn limit - do not update */
/* Limit updates per l2-learn node call to avoid prolonged update burst
- * as dtime advance over 1 minute mark, unless more than 1 min behind */
- if ((*count > 2) && (dtime == 1))
+ * as dtime advance over 1 minute mark, unless more than 1 min behind
+ * or SN obsolete */
+ if ((*count > 2) && (dtime == 1) && (dsn == 0))
return;
counter_base[L2LEARN_ERROR_HIT_UPDATE] += 1;