OVS流表规则求解

以下是ovs br-tun网桥的两台流表规则，看了好几天看不懂，求指教：
cookie=0x927ed897fa22f578, duration=1893.712s, table=10, n_packets=2679, n_bytes=113006, idle_age=0, priority=1 actions=learn(table=20,hard_timeout=300,priority=1,cookie=0x927ed897fa22f578,NXM_OF_VLAN_TCI[0..11],NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],load:0->NXM_OF_VLAN_TCI[],load:NXM_NX_TUN_ID[]->NXM_NX_TUN_ID[],output:NXM_OF_IN_PORT[]),output:1
cookie=0x927ed897fa22f578, duration=1781.320s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=1781, hard_age=0, priority=1,vlan_tci=0x0001/0x0fff,dl_dst=fa:16:3e:07:41:4a actions=load:0->NXM_OF_VLAN_TCI[],load:0x17->NXM_NX_TUN_ID[],output:2


从网上查看了下资料：http://geek.csdn.net/news/detail/69786 提到table10和table20是在学习mac地址的过程中：

文章中作者也是有些模糊的，建议楼主看系统的书籍。