bench/arty_ptp: reduce IGMP report interval to 2 seconds

Author: enjoy-digital

bench/arty_ptp.py

@@ -111,8 +111,9 @@ def __init__(self, sys_clk_freq=int(100e6), p2p=False, ptp_debug=False):
         if p2p:
             ptp_igmp_groups.append(0xE000006B)       # 224.0.0.107.
         self.add_etherbone(phy=self.ethphy, buffer_depth=255,
-            with_igmp   = True,
-            igmp_groups = ptp_igmp_groups,
+            with_igmp     = True,
+            igmp_groups   = ptp_igmp_groups,
+            igmp_interval = 2,
         )
 
         # PTP --------------------------------------------------------------------------------------