IP SLA Question

Hi Experts,

I'm currently confused about a question regarding IP SLA.

R1 will do all monitoring and R2 will act as a IP SLA responder while R4 should have been knowledge of IP SLA.

I know that I configure ip sla responder on R2 and on R1 I configure the sla commands...that seems to be ok.
But what does it mean "R4 should have been knowledge of IP SLA" ?
Maybe this means I should configure also on R1 monitoring as the destination R4 ?
Or is there any command I can mirror the traffic to this router ??

Any advice would be nice

Dennis

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