配置
LAN路由器
interface GigabitEthernet0/0 description towards R1 ip address 2.2.2.1 255.255.255.252 duplex auto speed autointerface GigabitEthernet0/1 description towards R2 ip address 3.3.3.1 255.255.255.252 duplex auto speed autoip route 0.0.0.0 0.0.0.0 2.2.2.2 track 1ip route 0.0.0.0 0.0.0.0 3.3.3.2 10
ip sla auto discoveryip sla 1 icmp-echo 20.20.20.1 source-ip 2.2.2.1ip sla schedule 1 life forever start-time nowtrack 1 ip sla 1 reachabilityip route 0.0.0.0 0.0.0.0 2.2.2.2 track 1
Below are the default parameters for IP SLA. Threshold (milliseconds): 5000 Operation timeout (milliseconds): 5000 Operation frequency (seconds): 60 One can change these parameters in the IP SLA configuration as per requirement.
LAN#show track Track 1 IP SLA 1 reachability Reachability is Up 4 changes, last change 00:06:58 Latest operation return code: OK Latest RTT (millisecs) 1 Tracked by: STATIC-IP-ROUTING 0
当跟踪1是流量到互联网时从主路由器R1去。
LAN#show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP + - replicated route, % - next hop overrideGateway of last resort is 2.2.2.2 to network 0.0.0.0S 0.0.0.0/0 [1/0] via 2.2.2.2 2.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 2.2.2.0/30 is directly connected, GigabitEthernet0/0L 2.2.2.1/32 is directly connected, GigabitEthernet0/0 3.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 3.3.3.0/30 is directly connected, GigabitEthernet0/1L 3.3.3.1/32 is directly connected, GigabitEthernet0/1 20.0.0.0/30 is subnetted, 1 subnetsS 20.20.20.0 [1/0] via 2.2.2.2
LAN#show ip sla configuration IP SLAs Infrastructure Engine-IIIEntry number: 1Owner: Tag: Operation timeout (milliseconds): 5000Type of operation to perform: icmp-echoTarget address/Source address: 20.20.20.1/2.2.2.1Type Of Service parameter: 0x0Request size (ARR data portion): 28Verify data: NoVrf Name: Schedule: Operation frequency (seconds): 60 (not considered if randomly scheduled) Next Scheduled Start Time: Start Time already passed Group Scheduled : FALSE Randomly Scheduled : FALSE Life (seconds): Forever Entry Ageout (seconds): never Recurring (Starting Everyday): FALSE Status of entry (SNMP RowStatus): ActiveThreshold (milliseconds): 5000Distribution Statistics: Number of statistic hours kept: 2 Number of statistic distribution buckets kept: 1 Statistic distribution interval (milliseconds): 20Enhanced History:History Statistics: Number of history Lives kept: 0 Number of history Buckets kept: 15 History Filter Type: None
LAN#show ip sla statistics IPSLAs Latest Operation StatisticsIPSLA operation id: 1 Latest RTT: 1 millisecondsLatest operation start time: 08:02:05 UTC Sat Aug 27 2016Latest operation return code: OKNumber of successes: 7Number of failures: 12Operation time to live: Forever
验证
使用本部分可确认配置能否正常运行。
Ping和traceroute去从主路由器的互联网
LAN#ping 8.8.8.8Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 msLAN#traceroute 8.8.8.8Type escape sequence to abort.Tracing the route to 8.8.8.8VRF info: (vrf in name/id, vrf out name/id) 1 2.2.2.2 0 msec 0 msec 0 msec
在主链路的所有问题的情况下将减少跟踪1。
%TRACKING-5-STATE: 1 ip sla 1 reachability Up->Down
LAN#show track Track 1 IP SLA 1 reachability Reachability is Down 5 changes, last change 00:00:33 Latest operation return code: Timeout Tracked by: STATIC-IP-ROUTING 0
当跟踪1沿着走流量时从附属路由器R2去
LAN#show ip route Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP + - replicated route, % - next hop overrideGateway of last resort is 3.3.3.2 to network 0.0.0.0S 0.0.0.0/0 [10/0] via 3.3.3.2 2.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 2.2.2.0/30 is directly connected, GigabitEthernet0/0L 2.2.2.1/32 is directly connected, GigabitEthernet0/0 3.0.0.0/8 is variably subnetted, 2 subnets, 2 masksC 3.3.3.0/30 is directly connected, GigabitEthernet0/1L 3.3.3.1/32 is directly connected, GigabitEthernet0/1 20.0.0.0/30 is subnetted, 1 subnetsS 20.20.20.0 [1/0] via 2.2.2.2
LAN#show ip sla statistics IPSLAs Latest Operation StatisticsIPSLA operation id: 1 Latest RTT: NoConnection/Busy/TimeoutLatest operation start time: 08:05:05 UTC Sat Aug 27 2016Latest operation return code: TimeoutNumber of successes: 9Number of failures: 13Operation time to live: Forever
LAN#ping 8.8.8.8Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 msLAN#traceroute 8.8.8.8Type escape sequence to abort.Tracing the route to 8.8.8.8VRF info: (vrf in name/id, vrf out name/id) 1 3.3.3.2 0 msec 0 msec 0 msec
故障排除
目前没有针对此配置的故障排除信息。
TAC Authored
由思科工程师提供
Gaurav Mahajan
Cisco TAC工程师
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