“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 usingICMPprotocol ).
Some of tracked IPs I remember may be 22.214.171.124 or 126.96.36.199. 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.
Lab Scenario: HSRP with Default Route Tracking
Below is one lab scenario created to help understand the setup and requisite configuration of Default Route Tracking:
BGP timers have been manipulated in lab setup for faster convergence. This may be different from real life scenario.
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