Cisco Enhanced Object Tracking

HSRP中可以对上联口的UP/Down状态进行监控，从而实现冗余网关的切换

EOT可以对接口提供更丰富的监控：

IP routing是否enable（例如ip routing被全局关闭）
端口UP/Down
接口是否被分配IP（上联口IP为DHCP分配）

监控上行端口UP/DOWN

监控某条路由是否可达

正常情况下

SW1#show track
Track 5
IP route 2.2.2.2 255.255.255.255 reachability
Reachability is Up (OSPF)
3 changes, last change 00:01:06
First-hop interface is FastEthernet1/5
Tracked by:
HSRP Vlan100 100

而当2.2.2.2路由失效时

Track 5
IP route 2.2.2.2 255.255.255.255 reachability
Reachability is Down (no route)
2 changes, last change 00:12:26
First-hop interface is unknown
Tracked by:
HSRP Vlan100 100

引发HSRP Active切换

SW1#
*Mar 1 00:23:02.647: %HSRP-5-STATECHANGE: Vlan100 Grp 100 state Active -> Speak
*Mar 1 00:23:12.647: %HSRP-5-STATECHANGE: Vlan100 Grp 100 state Speak -> Standby

转载于:https://blog.51cto.com/55348/1278948

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