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Routing & Switching · Intermediate

IP SLA

Cisco IOS feature that generates synthetic probes (ICMP, UDP jitter, HTTP) to measure reachability and performance.

Definition

IP SLA operations run on a schedule and record success, latency, jitter and loss. Combined with object tracking they can remove static routes, change HSRP priority or trigger PBR changes when a probe fails. They are central to dual-ISP failover designs without BGP.

Example

ip sla 1 / icmp-echo 8.8.8.8 source-interface Gi0/0 / frequency 5 ; ip sla schedule 1 life forever start-time now

Exam tip

IP SLA alone does nothing to routing; it must be tied to a track object referenced by the route.

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