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
/24
/24 RA RC RD

4. Configuration Components
IP SLA
Define IP SLA Operation
Object Tracking
Link track to IP SLA Operation
Objects
Link objects to track. Such as Static route, PBR, HSRP, etc.

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

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

7. PBR with Multiple Object Tracking
On RA: ip sla 1 icmp-echo frequency 3 ip sla schedule 1 life forever start-time now ! ip sla 2 icmp-echo frequency 3 ip sla schedule 2 life forever start-time now ! track 11 ip sla 1 reachability track 22 ip sla 2 reachability ! access-list 101 permit any route-map LAB permit match ip addess set ip next-hop verify-availability track 11 set ip next-hop verify-availability track 22 ! Interface Ethernet1/0 ip address ip policy route-map LAB
the configured policy is that packets received on e0/0( /24), should be forwarded to only if that device is reachable (responding to pings). If is not up, then the packets should be forwarded to If is also not reachable, then the policy routing fails and the packets are routed according to the routing table.
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8. Parameters
Frequency Sets the rate at which a specified Cisco IOS IP SLAs operation is sent into the network.
Timeout Sets the amount of time for which the Cisco IOS IP SLAs operation waits for a response from its request packet.
Threshold Sets 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
timeout 500
threshold 2
frequency 3
ip sla schedule 1 life forever start-time now

9. “Show” Commands for IP SLA
show ip sla statistics Displays 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: EST Mon Oct
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
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10. “Show” Commands for IP SLA
show ip sla configuration The 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: /
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)
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11. “Show” Commands for Object Tracking
show track Display 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 brief Display a list of the tracked objects and its status
Example:
R1#sh track brief
Track Object Parameter Value Last Change
rtr reachability Up :47:32
rtr 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-table To display information about the tracked static table.
Example:
R1#sh ip route track-table
ip route 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 (23 matches)
Extended IP access list 102
10 permit icmp host host (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 ip icmp, debug ip packet <access-list>
HSRP: debug standby event/packets
PBR: debug ip policy, debug route-map

17. Reference
Introduction to IP SLA
Reliable Static Routing Backup Using Object Tracking
Policy Based Routing (PBR)
PBR Support for Multiple Tracking Options
Enhanced Object Tracking
Configuring HSRP with Object Tracking
Configuring GLBP with Object Tracking
Configuring VRRP with Object Tracking