Keepalived 定期發送免費 ARP

有沒有辦法讓keepalived定期發送免費ARP？

我們有以下情況：

1. 交換機故障（VLAN 設置）
2. keepalived 故障轉移到備份實例
3. 備份實例發送了免費 ARP，但 Cisco ASA 設備沒有收到（因為交換機故障）
4. 當交換機恢復時（幾分鐘後）無法訪問 VIP 原因 ASA 未刷新 ARP 表（ARP 表到期時間設置為 4h）
5. 由於 ASA 已經擁有來自先前活動節點的 MAC，因此它沒有發送 ARP 請求
6. 在我們重新啟動啟動新 GARP 的 keepalived 實例之前，無法訪問 VIP

因此，我們認為我們可以通過定期 GARP 來避免這種情況。這是一個好方法嗎？有沒有辦法在keepalived中做到這一點？

有什麼其他建議可以避免此類問題嗎？

保活配置：

global_defs {
  notification_email {
    email@address.com
  }

  notification_email_from SERVER_1
  smtp_server smtp.server.local
  smtp_connect_timeout 30
  router_id SERVER_1
}

vrrp_instance V1 {
   state BACKUP
   nopreempt
   interface eth0
   lvs_sync_daemon_interface eth0
   virtual_router_id 150
   priority 120
   advert_int 1
   persistence_timeout 0
   smtp_alert

   authentication {
       auth_type PASS
       auth_pass xxx
   }

   virtual_ipaddress {
   10.xxx.xxx.xxx
   }
}

keepalived 1.2.20 及以上版本支持以下有關免費 ARP 的配置設置，我需要的是 vrrp_garp_master_refresh。

   # delay for second set of gratuitous ARPs after transition to MASTER
   vrrp_garp_master_delay 10    # seconds, default 5, 0 for no second set

   # number of gratuitous ARP messages to send at a time after transition to MASTER
   vrrp_garp_master_repeat 1    # default 5

   # delay for second set of gratuitous ARPs after lower priority advert received when MASTER
   vrrp_garp_lower_prio_delay 10

   # number of gratuitous ARP messages to send at a time after lower priority advert received when MASTER
   vrrp_garp_lower_prio_repeat 1

   # minimum time interval for refreshing gratuitous ARPs while MASTER
   vrrp_garp_master_refresh 60  # secs, default 0 (no refreshing)

   # number of gratuitous ARP messages to send at a time while MASTER
   vrrp_garp_master_refresh_repeat 2 # default 1

   # Delay in ms between gratuitous ARP messages sent on an interface
   vrrp_garp_interval 0.001          # decimal, seconds (resolution usecs). Default 0.

   # Delay in ms between unsolicited NA messages sent on an interface
   vrrp_gna_interval 0.000001        # decimal, seconds (resolution usecs). Default 0.

引用自：https://serverfault.com/questions/821809