使用IP SLA，配置静态路由追踪

简介

使用IP服务级别协议(SLA)，本文描述如何配置跟踪静态路由。

贡献的Gaurav Mahajan， Cisco TAC工程师。

先决条件

要求

思科建议您有静态路由知识。

使用的组件

本文档中的信息根据Cisco IOS^®软件版本15.2(4)M4

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您使用的是真实网络，请确保您已经了解所有命令的潜在影响。

配置

网络图

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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。