1.拓扑图
2.防火墙配置
3.交换机配置
interface GigabitEthernet1/0/47
switchport access vlan 30
switchport mode access
channel-protocol lacp
channel-group 31 mode active
interface GigabitEthernet2/0/47
switchport access vlan 30
switchport mode access
channel-protocol lacp
channel-group 31 mode active
interface GigabitEthernet1/0/48
switchport access vlan 30
switchport mode access
channel-protocol lacp
channel-group 30 mode active
interface GigabitEthernet2/0/48
switchport access vlan 30
switchport mode access
channel-protocol lacp
channel-group 30 mode active
interface Port-channel30
switchport access vlan 30
switchport mode access
interface Port-channel31
switchport access vlan 30
switchport mode access
interface Vlan30
ip address 10.10.30.2 255.255.255.0
即，使用交叉上联
4.若不交叉，即交换机上联到主、备墙的端口在同一etherchannel下并在同一vlan下。那么连接备墙的交换机端口会显示为橙色，而且断开监控端口线的话，会跳到备机，但是网不通。同时，拔掉心跳线会导致丢包和高延迟
