IP SLA track not own interface

[SPKV]

follow this diagram

R1 ---Link1--- R2 ---Link2--- Internet

I want to track interface up/down Link2 of R2 but i can only config at R1. How can I do.

Thanks.

[Bilal Nawaz]

sla icmp echo the interface or external router from R1

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_icmp_echo.html

There may be a way to do it with ip sla responder too but not sure 100%

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