IntermediatePublished 2026-07-02
Tuning HSRP Timers for Faster Failover
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Lab 6 of 13 in First-Hop Redundancy (HSRP & VRRP) · ← Previous · Next →
CCNA exam domain: IP Connectivity
Configure HSRP on two routers with a shared virtual gateway and speed up failover by tightening hello/hold timers to 1/3 seconds. Validate deterministic active/standby selection and confirm timer settings via show commands.
Learning objectives
- Build an HSRP pair that presents a single virtual default gateway to hosts
- Make the active router deterministic using priority and preempt
- Tune HSRP hello/hold timers to 1 and 3 seconds on both routers
- Verify operational state and timers with show standby commands
- Explain the trade-offs of faster timers (detection speed vs. control-plane load)
Troubleshooting focus
- HSRP timers not matching on both routers can cause unexpected delays or churn
- Mismatched group number or virtual IP prevents the pair from forming
- Host default gateway set to a real router IP instead of the virtual IP breaks resilience
- Preempt missing on the intended primary prevents it from reclaiming active after recovery
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How this lab is graded
- Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with
access-class, are stated in the guide and do have to match. - Addresses, modes and protocol keywords are exact. An IP address, a subnet mask,
switchport mode trunk, an encapsulation — these carry the meaning of the lab, so they are graded as written in the guide. - Grading reads your saved configuration. Export the lab from CML after you have configured it, and make sure anything you set is in the
running-config— a change that only exists in a terminal session never reaches the grader. - You can submit as many times as you like. Your best score stands, and each attempt tells you which checks passed so you can work the gaps.
- Scored something you believe is correct? Use Report an issue on this page — that is exactly how the grading fixes in the changelog got found.
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