HSRP Active Device Flapping: Adjusting Parameters for Stability

Common Causes of HSRP Active Device Flapping

Question

While using HSRP, if you see the active devices constantly changing, which parameter may need to be adjusted?

Answers

Explanations

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A.

HSRP (Hot Standby Router Protocol) is a First Hop Redundancy Protocol (FHRP) used in computer networks to provide redundancy and failover capabilities for IP networks. When multiple routers are configured with HSRP, one router is elected as the active router, while the other routers are in a standby state.

If you see the active devices constantly changing while using HSRP, it indicates that there is an issue with the HSRP configuration. The problem may be caused by a misconfiguration of one or more of the HSRP parameters.

The four parameters that can be adjusted in HSRP are hold time, delay, standby group, and priority.

  • Hold time: The hold time is the amount of time that the active router must wait before declaring itself as inactive. If the hold time is too short, the active router may declare itself as inactive, and another router may become the active router. If the hold time is too long, the active router may not be able to detect when it has become inactive, and another router may not become the active router in a timely manner.

  • Delay: The delay parameter is used to specify the delay in milliseconds before a router becomes the active router. If the delay is too short, a router may become the active router before it has completed its initialization process, causing instability in the network.

  • Standby group: The standby group parameter is used to specify the HSRP group that the router belongs to. If the standby group is misconfigured, a router may be participating in the wrong HSRP group, causing instability in the network.

  • Priority: The priority parameter is used to specify the priority of the router in the HSRP group. The router with the highest priority becomes the active router. If the priority is misconfigured, a router with a lower priority may become the active router, causing instability in the network.

In conclusion, if you see the active devices constantly changing while using HSRP, the parameter that may need to be adjusted is the priority.