1)IP SlA/track 本地路由设备到下一台三层交换机之间串接一台透明设备,当对端shutdown状态,本地设备仍处于UP,这时将导致所谓的“黑洞”现象, 我们可以通过SLA来做网络端到端的可用性监测,从而解决这个问题。 R871(config)#ip sla 64 R871(config-ip-sla)# icmp-echo 192.168.64.2 R871(config)#ip sla schedule 64 life forever start-time now R871(config)#ip sla 65 R871(config-ip-sla)# icmp-echo 192.168.65.2 R871(config)#ip sla schedule 65 life forever start-time now ---采用icmp协议来监视,即发出icmp echo包来探测对端的可达性,192.168.64.2/65.2为对端IP地址 2)定义SLA监视组 R871(config)#track 64 rtr 64 reachability…………………….定义跟踪组 R871(config)#track 65 rtr 65 reachability 3)定义icmp失效时效 scheduler max-task-time 5000 4)定义需要指定源路由的ip地址 access-list 68 permit 192.168.68.0 0.0.0.255 5)配置路由策略 route-map test permit 10 match ip address 68 set ip next-hop verify-availability 192.168.65.2 10 track 65 set ip next-hop verify-availability 192.168.64.2 64 track 64 exit 6)接口应用路由策略 interface FastEthernet4 ip address 192.168.66.2 255.255.255.0 ip policy route-map test exit 7)缺省路由应用track ip route 0.0.0.0 0.0.0.0 192.168.64.2 10 track 64 ip route 0.0.0.0 0.0.0.0 192.168.65.2 100 track 65 |