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IP SLA with Object Tracking

IP SLA with Object Tracking. - Configuration example -Troubleshooting. Where it can be implemented. Static Routing Hot Standby Router Protoco ( HSRP ) Policy Based Routing ( PBR ). When NOT to use Object Tracking .

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IP SLA with Object Tracking

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  1. IP SLA with Object Tracking - Configuration example -Troubleshooting

  2. Where it can be implemented • Static Routing • Hot Standby Router Protoco (HSRP) • Policy Based Routing (PBR)

  3. When NOT to use Object Tracking • Directly connected interfaces. • Running routing protocol (i.e. RIP, OSPF, EIGRP, BGP, etc.) Tracks G0/0 G0/0 RA RB No route being advertised 200.2.2.0/24 192.168.1.0/24 RA RC RD

  4. Configuration Components

  5. Static Routing with Object Tracking On RA:interface Ethernet0/0description primary-link ip address 200.1.1.2 255.255.255.0!interface Ethernet0/1 description backup-link ip address 200.2.2.2 255.255.255.0!ip sla 1icmp-echo 212.23.1.1 source-ip 200.1.1.2 frequency 3ip sla schedule 1 life forever start-time nowtrack 2 ip sla 1 reachability!ip route 0.0.0.0 0.0.0.0 200.1.1.1 track 2ip route 0.0.0.0 0.0.0.0 200.2.2.1 250!access-list 101 permit icmp any host 212.23.1.1route-map LOCAL-POLICY permit 10 match ip address 101 set ip next-hop 200.1.1.1!ip local policy route-map LOCAL-POLICY

  6. HSRP with Object Tracking On RA (Active Router): ip sla 1 icmp-echo 4.2.2.2 frequency 3ip sla schedule 1 life forever start-time now!track 2 ip sla 1 reachability!interface Ethernet0/0ip address 10.10.10.1 255.255.255.0 standby 1 ip 10.10.10.3 standby 1 priority 110 standby 1 preempt standby 1 track 2 decrement 15!access-list 101 permit icmp any host 4.2.2.2route-map LOCAL-POLICY permit 10match ip address 101set ip next-hop 200.1.1.1!ip local policy route-map LOCAL-POLICY

  7. PBR with Multiple Object Tracking On RA:ip sla 1 icmp-echo 200.1.1.2 frequency 3ip sla schedule 1 life forever start-time now!ip sla 2 icmp-echo 200.2.2.2 frequency 3ip sla schedule 2 life forever start-time now!track 11 ip sla 1 reachability track 22 ip sla 2 reachability!access-list 101 permit 10.10.10.0 0.0.0.255 anyroute-map LAB permit 10 match ipaddess 101set ip next-hop verify-availability 200.1.1.2 10 track 11 set ip next-hop verify-availability 200.2.2.2 20 track 22!Interface Ethernet1/0 ip address 10.10.10.1 255.255.255.0 ip policy route-map LAB

  8. Parameters • FrequencySets the rate at which a specified Cisco IOS IP SLAs operation is sent into the network. • TimeoutSets the amount of time for which the Cisco IOS IP SLAs operation waits for a response from its request packet. • ThresholdSets the rising threshold that generates a reaction event and stores history information for the Cisco IOS IP SLAs operation. Example: ip sla 1 icmp-echo 212.23.1.1 timeout 500 threshold 2 frequency 3 ip sla schedule 1 life forever start-time now

  9. “Show” Commands for IP SLA • show ip sla statisticsDisplays the current state of the Cisco IOS IP SLAs operation • Example: • R1#show ip sla statistics • Round Trip Time (RTT) for Index 1 • Latest RTT: 1 milliseconds • Latest operation start time: *03:55:56.835 EST Mon Oct 25 2010 • Latest operation return code: OK • Number of successes: 87 • Number of failures: 24 • Operation time to live: Forever IP SLA operations status: OK = good Over Threshold = exceed threshold < timeout Timeout = over timeout value Successes & Failure icmp packet statistics Duration of operation

  10. “Show” Commands for IP SLA • show ip sla configurationThe output will list the supported operations • Example: • R1#sh ip sla configuration • Entry number: 1 • Type of operation to perform: icmp-echo • Target address/Source address: 212.23.1.1/200.1.1.2 • Operation timeout (milliseconds): 500 • Schedule: • Operation frequency (seconds): 3 • Next Scheduled Start Time: Start Time already passed • ….. • Life (seconds): Forever • Threshold (milliseconds): 2 • …. Operation number Operation type Source & destination addresses Timeout (msec) Frequency (sec) Operation duration Threshold (msec)

  11. “Show” Commands for Object Tracking • show trackDisplay the detail of the tracked objects • Example: • R1#sh track • Track 1 • Response Time Reporter 1 reachability • Reachability is Up • 3 changes, last change 01:31:14 • Latest operation return code: OK • Latest RTT (millisecs) 1 • Tracked by: • STATIC-IP-ROUTING 0 Track number IP SLA operation number. The object is tracking the reachability of ip sla 1. Reachability or State status - Up or down IP SLA operations status: OK = good Over Threshold = exceed threshold < timeout Timeout = over timeout value Type of objects tracked by this track number

  12. “Show” Commands for Object Tracking • show track briefDisplay a list of the tracked objects and its status • Example: • R1#sh track brief • Track Object Parameter Value Last Change • 1 rtr 1 reachability Up 01:47:32 • 2 rtr 1 state Down 00:33:33 Track Number Reachability or State status up/down Reachability or State IP SLA operation that the track is tracking

  13. “Show” Commands for Static Routing • show ip route track-tableTo display information about the tracked static table. • Example: • R1#sh ip route track-table • ip route 0.0.0.0 0.0.0.0 200.1.1.1 track 1 state is [up] Track Number State of tracked static route - up/down

  14. “Show” Commands for PBR • Show ip access-list [access number]Using the access-list to confirm if the icmp packets are routed through the right path. • Example: • R1#sh ip access-lists • Extended IP access list 101 • 10 permit icmp any host 212.23.1.1 (23 matches) • Extended IP access list 102 • 10 permit icmp host 212.23.1.1 host 200.1.1.2 (15 matches)

  15. Troubleshooting Steps Step 1: Ping Test Step 2: IP SLA • Check IP SLA operation status Step 3: Object Tracking • Check tracked object status Step 4: Tracked Static Route/PBR/HSRP • Check routing table • Check HSRP router roles • Check route-map (show ip route-map & show ip policy)

  16. Useful Debugs • IP SLA: debug ip sla trace, debug ip sla error • Object Tracking: debug track • ICMP packet: debug ipicmp, debug ip packet <access-list> • HSRP: debug standby event/packets • PBR: debug ip policy, debug route-map

  17. Reference • Introduction to IP SLAhttp://www.cisco.com/en/US/tech/tk920/tsd_technology_support_sub-protocol_home.html • Reliable Static Routing Backup Using Object Trackinghttp://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html • Policy Based Routing (PBR)http://www.cisco.com/en/US/products/ps6637/products_ios_protocol_option_home.html • PBR Support for Multiple Tracking Optionshttp://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtpbrtrk.html • Enhanced Object Trackinghttp://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_eot.html • Configuring HSRP with Object Trackinghttp://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_hsrp.html • Configuring GLBP with Object Trackinghttp://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_glbp.html • Configuring VRRP with Object Trackinghttp://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_vrrp.html

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