“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 126.96.36.199 or 188.8.131.52. 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.
I am here to share my knowledge and experience in the field of networking with the goal being - "The more you share, the more you learn."
I am a biotechnologist by qualification and a Network Enthusiast by interest. I developed interest in networking being in the company of a passionate Network Professional, my husband.
I am a strong believer of the fact that "learning is a constant process of discovering yourself."
- Rashmi Bhardwaj (Author/Editor)