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Zorluk: OrtaFirst Hop Redundancy Protocols (HSRP and VRRP)

An engineer is monitoring an HSRP group on VLAN 30 between two switches, DSW1 and DSW2. DSW1 is configured with an HSRP priority of 115115, preemption enabled, and interface tracking on interface GigabitEthernet1/0/1 with a priority decrement of 2020. DSW2 is configured with an HSRP priority of 105105 and preemption enabled. Under normal operating conditions, DSW1 is the Active router. If interface GigabitEthernet1/0/1 on DSW1 goes down, which switch becomes the Active router for HSRP group 30, and what is DSW1's updated priority?

  1. DSW2 becomes the Active router, and DSW1's priority is updated to 9595.Cevap
  2. B
    DSW1 remains the Active router because preemption only triggers when a higher-priority router reboots.
  3. C
    DSW2 becomes the Active router, and DSW1's priority is updated to 8585.
  4. D
    DSW1 remains the Active router because DSW2's priority of 105105 is below the default active threshold of 110110.

Cevap

DSW2 becomes the Active router, and DSW1's priority is updated to 9595.
When the tracked interface GigabitEthernet1/0/1 on DSW1 fails, HSRP interface tracking automatically reduces DSW1's priority by the configured decrement of 2020, bringing its priority down from 115115 to 9595. Because DSW2 has an active priority of 105105 (which is higher than 9595) and has preemption enabled, DSW2 immediately takes over the Active router role for HSRP group 30.

Adım Adım Çözüm

1
Calculate the updated HSRP priority for DSW1 after interface failure
DSW1's initial priority of 115115 minus the configured decrement of 2020 equals 9595.
Interface tracking reduces the HSRP priority by the specified decrement value when the tracked interface enters a down state.
2
Compare the updated HSRP priorities between DSW1 and DSW2
DSW2 priority (105105) is greater than DSW1 updated priority (9595).
The HSRP election process favors the router with the highest priority value.
3
Evaluate preemption state to determine the active router
DSW2 preempts DSW1 and becomes the Active router for HSRP group 30.
Preemption is enabled on DSW2, allowing it to assume the Active role as soon as its priority exceeds the current Active router's priority.

Anahtar Kavram

HSRP Interface Tracking and Preemption Mechanics
Tahmini Süre:1m 0s
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Konular

First Hop Redundancy Protocols (HSRP and VRRP)

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