现场两台MSR36路由器做了VRRP,display vrrp查看vlan3各自状态都是Master
正常情况一边是Master,一边是Backup
查看1、2两台设备的vrrp状态,vlan1和vlan2正常,一主一备,vlan3异常,状态两边都是主,两个路由器vlan3之间能相互ping通,说明网络没问题
[1]dis vrrp
IPv4 Virtual Router Information:
Running mode : Standard
Total number of virtual routers : 3
Interface VRID State Running Adver Auth Virtual
Pri Timer Type IP
----------------------------------------------------------------------------
Vlan1 100 Backup 90 100 Not supported 197.168.100.1
Vlan2 200 Master 110 100 Not supported 182.30.100.1
Vlan3 208 Master 110 100 Not supported 182.28.100.1
[2]dis vrrp
IPv4 Virtual Router Information:
Running mode : Standard
Total number of virtual routers : 3
Interface VRID State Running Adver Auth Virtual
Pri Timer Type IP
----------------------------------------------------------------------------
Vlan1 100 Master 110 100 Not supported 197.168.100.1
Vlan2 200 Backup 90 100 Not supported 182.30.100.1
Vlan3 208 Master 90 100 Not supported 182.28.100.1
接着查看三个vlan接口的配置,发现都配置了包过滤
#
interface Vlan-interface3
packet-filter name in inbound
#
查看ACL的配置
发现vlan1和vlan2的ACL是deny了一些IP最后permit,vlan3的ACL是permit了一些IP最后是deny,查看rule规则,两个MSR36之间只放通了ICMP报文,怀疑是VRRP报文没有正常交互,现场测试了取消vlan 3接口的包过滤,发现VRRP状态就正常了
综上,设备上做了ACL包过滤的话,两个MSR36之间需要放通到固定组播地址224.0.0.18的VRRP报文,如下
rule 101 permit ip source 182.28.100.0 0.0.0.255 destination 224.0.0.18 0
加上之后,现场反馈vlan 3的VRRP状态正常了
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