020 IP SLA Tracking

IP SLA based tracking.

Router(config) # ip sla 1

Router(config-ip-sla) # icmp-echo Y.Y.Y.Y

Router(config-ip-sla-echo) # frequency 10

Router(config-ip-sla-echo) # timeout 7000

Router(config-ip-sla-echo) # threshold 5000

Router(config) # ip sla schedule 1 life forever start-time now

Router(config) # track 2 rtr 1

Router(config) # interface GigabitEthernet0/0

Router(config-if) #  standby 1 ip x.x.x.x

Router(config-if) #  standby 1 priority 125

Router(config-if) #  standby 1 preempt

Router(config-if) #  standby 1 track 2 decrement 50

Note:

• IP SLA probes simulate specific types of traffic & send it to a receiver, called as a responder.
• Y.Y.Y.Y = ip address of responder
• Timers

1.      Frequency: (Unit: Sec)

2.      Timeout: maximum time required for SLA operation to complete. (Unit: mSec)

3.      Threshold: Time to activate a response to IP SLA violation (Unit: mSec)

Frequency > Timeout > Threshold.

Commands for troubleshooting

Router# sh ip sla configuration

IP SLAs Infrastructure Engine-II

Entry number: 1

Owner:

Tag:

Type of operation to perform: icmp-echo

Target address/Source address: Y.Y.Y.Y/0.0.0.0

Operation timeout (milliseconds): 7000

Type Of Service parameters: 0x0

Vrf Name:

Request size (ARR data portion): 28

Verify data: No

Schedule:

   Operation frequency (seconds): 10  (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): Active

Threshold (milliseconds): 5000

Distribution Statistics:

   Number of statistic hours kept: 2

   Number of statistic distribution buckets kept: 1

   Statistic distribution interval (milliseconds): 4294967295

History Statistics:

   Number of history Lives kept: 0

   Number of history Buckets kept: 15

   History Filter Type: None

Enhanced History:

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Router # sh track 2

Track 2

  Response Time Reporter 1 state

  State is Up

    91 changes, last change 3d00h

  Latest operation return code: OK

  Latest RTT (millisecs) 36

  Tracked by:

    HSRP GigabitEthernet0/0 1

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Router #sh ip sla statistics

Round Trip Time (RTT) for       Index 1

        Latest RTT: 44 milliseconds

Latest operation start time: 09:27:30.566 gmt Thu May 12 2011

Latest operation return code: OK

Number of successes: 159

Number of failures: 0

Operation time to live: Forever