两台服务器都开始keepalived，BACKUP服务器立即转为MASTER STATE。两人现在都成为了大师。
两个节点都在发送 VRRP 广告消息。
在主服务器上：
[root@zhsq1 ~]# tcpdump -c 3 -i em1 host 224.0.0.18
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on em1, link-type EN10MB (Ethernet), capture size 65535 bytes
11:01:35.526355 IP zhsq1 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 153, authtype simple, intvl 1s, length 20
11:01:36.526497 IP zhsq1 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, prio 153, authtype simple, intvl 1s, length 20
11:01:37.527561 IP zhsq1 > 224.0.0.18: VRRPv2, Advertisement, vrid 51, …