156-215.80 · Question #290
What is the purpose of Priority Delta in VRRP?
The correct answer is C. When an Interface fails, Effective Priority = Priority - Priority Delta. Priority Delta in VRRP defines how much a router's effective priority is reduced when one of its tracked interfaces goes down. This mechanism ensures automatic failover to a higher-priority peer.
Question
What is the purpose of Priority Delta in VRRP?
Options
- AWhen a box is up, Effective Priority = Priority + Priority Delta
- BWhen an Interface is up, Effective Priority = Priority + Priority Delta
- CWhen an Interface fails, Effective Priority = Priority - Priority Delta
- DWhen a box fails, Effective Priority = Priority - Priority Delta
How the community answered
(24 responses)- A4% (1)
- B4% (1)
- C92% (22)
Why each option
Priority Delta in VRRP defines how much a router's effective priority is reduced when one of its tracked interfaces goes down. This mechanism ensures automatic failover to a higher-priority peer.
Priority Delta is not added to priority when a box is up - the base priority value already represents the normal operating state.
Priority Delta is not added when an interface comes up - it is a penalty subtracted on failure, not a bonus added on recovery.
When a monitored interface fails on the VRRP master, the effective priority is recalculated as Priority minus Priority Delta. If this reduction causes the effective priority to fall below a backup router's priority, a new master election occurs and the backup takes over, providing interface-failure-driven failover.
Priority Delta responds to interface-level failures, not full box failures - a complete box failure removes the router from VRRP election entirely rather than adjusting its priority.
Concept tested: VRRP Priority Delta interface failure behavior
Source: https://support.checkpoint.com/results/sk/sk32064
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