hsrp
int vlan 10
ip add 10.1.1.2 255.255.255.0
standby 10 ip 10.1.1.1
standby 10 priority 110
standby 10 preempt
优先级相同比较高的ip地址
hsrp and stp
认证配置
standby 10 authentication xyz123(默认密码cisco)
standby 10 timers msec 200 msec 7500
standby 10 preempt delay minimum 300(修改强占延迟)
standby 10 version 2
hsrp支持版本1和版本2
版本1支持0-255个组，虚拟mac是0000.0c07.acxx(hsrp group 组)
hello包发送组播地址224.0.0.2
hsrpv2
支持0-4095个组
虚拟mac 0000.0c9f.fxxx(代表组号)
hello包发送组播224.0.0.102
端口追踪
stanbdy 10 track f0/24 50
track事件
track 23 ip route 0.0.0.0 0.0.0.0 reachability
int f0/0
standby 1 track 23 decrement 50
