某局点AC管理网段配置VRRP 后AP无法上线的案例
一、问题现象
某局点AC 1+1快速热备,AP二层注册,同时管理网段配置了VRRP,AP主备状态正常。此时新增若干AP,只需要注册在备AC上,配置完成后始终无法上线。
二、告警信息
AP的debug信息中不断出现如下报错:
*Sep 1 17:11:58:171 2017 ac-2 LWPS/7/Error: Packet is dropped for real ip
三、原因分析
查看主备AC配置:
主AC:
#wlan backup-ac ip 10.152.104.253
#dhcp server ip-pool guanli
network 10.152.104.0 mask 255.255.255.0
network ip range 10.152.104.20 10.152.104.200
gateway-list 10.152.104.254
dns-list 8.8.8.8
expired day 0 hour 8
#
interface Vlan-interface100
description GuanLi
ip address 10.152.104.252 255.255.255.0
vrrp vrid 1 virtual-ip 10.152.104.254
vrrp vrid 1 priority 120
#
备AC:
#wlan backup-ac ip 10.152.104.252
#dhcp server ip-pool guanli
network 10.152.104.0 mask 255.255.255.0
network ip range 10.152.104.20 10.152.104.200
gateway-list 10.152.104.254
dns-list 8.8.8.8
expired day 0 hour 8
#
interface Vlan-interface100
description GuanLi
ip address 10.152.104.253 255.255.255.0
vrrp vrid 1 virtual-ip 10.152.104.254
vrrp vrid 1 priority 12
可见,主备AC都将网关配置成virtual-ip,分别将备份AC IP指向对方。而此时,由于AC仍然以real ip回应AP,造成AP认为地址冲突。
四、解决办法
AC 1+1热备不需要配置VRRP,主备AC都以real ip进行交互,删除VRRP配置。
五、建议与总结
2018年06月
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