“HSRP + IP Sla tracking of remote IP” is a preferred failover approach wherein a remote IP is tracked to provide routing redundancy for routing IP traffic not dependent on the availability of any single.
Many a times network implementers/administrators will track Service provider DNS or some other globally available Global IP (via IP SLA monitor or RTR feature set using ICMP protocol ). Some of tracked IPs I remember may be 184.108.40.206 or 220.127.116.11. Though I may not be referring to these IPs, however let’s not forget that tracked Global IPs may block ICMP ping to mitigate security threats like DOS/DDOS attacks. In this case, HSRP track protocol dependence on Global IP tracking may fail.
To address this situation, we may use Default Route hsrp tracking.
Below is one lab scenario created to help understand the setup and requisite configuration –
BGP timers have been manipulated in lab setup for faster convergence. This may be different from real life scenario.“
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