--- zzzz-none-000/linux-4.1.38/net/bridge/br_stp_bpdu.c	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/net/bridge/br_stp_bpdu.c	2020-11-25 10:06:48.000000000 +0000
@@ -81,6 +81,15 @@
 	if (p->br->stp_enabled != BR_KERNEL_STP)
 		return;
 
+#if defined(CONFIG_BCM_KF_STP_LOOP) && (defined(CONFIG_BCM_FBOND) || defined(CONFIG_BCM_FBOND_MODULE))
+	// for debugging purposes only:
+	if (p->is_bpdu_blocked) {
+		printk("supressing transmission of config bpdu on port (%s)\n", p->dev->name);        
+		return;
+	}
+#endif
+    
+
 	buf[0] = 0;
 	buf[1] = 0;
 	buf[2] = 0;
@@ -126,6 +135,14 @@
 	if (p->br->stp_enabled != BR_KERNEL_STP)
 		return;
 
+#if defined(CONFIG_BCM_KF_STP_LOOP) && (defined(CONFIG_BCM_FBOND) || defined(CONFIG_BCM_FBOND_MODULE))
+	// for debugging purposes only:
+	if (p->is_bpdu_blocked) {
+		printk("supressing transmission of tcn bpdu on port (%s)\n", p->dev->name);		  
+		return;
+	}
+#endif
+
 	buf[0] = 0;
 	buf[1] = 0;
 	buf[2] = 0;