Keepalived 定期发送免费 ARP

Question

有没有办法让keepalived定期发送免费的ARP？

我们有以下情况：

1. 交换机故障（VLAN 设置）
2. keepalived 故障转移到备份实例
3. 备份实例发送了无偿 ARP，但 Cisco ASA 设备没有收到（因为交换机故障）
4. 当交换机恢复时（几分钟后）VIP 无法访问，因为 ASA 没有刷新 ARP 表（ARP 表到期时间设置为 4h）
5. 由于 ASA 已经拥有来自先前活动节点的 MAC，因此它没有发送 ARP 请求
6. VIP 无法访问，直到我们重新启动了启动新 GARP 的 keepalived 实例

因此，我们认为我们可以通过定期 GARP 来避免这种情况。这是一个好方法吗，有没有办法在keepalived中做到这一点？

还有其他建议可以避免此类问题吗？

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
    }
}

Answer 1

keepalived 1.2.20 及以上版本支持以下有关免费 ARP 的配置设置，vrrp_garp_master_refresh 是我需要的。

    # 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.