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What is the implication of the use of the same HSRP group ID on multiple interfaces?

April 26, 2017group hsrp Id implication interfaces

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What is the implication of the use of the same HSRP group ID on multiple interfaces?

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A. When you define the same HSRP group ID on multiple interfaces, they all share the same HSRP virtual MAC address. In most modern LAN switches, there are no issues because they maintain a per-VLAN MAC address table. However, if your network contains any third party switches which maintain a system-wide MAC address table regardless of VLAN, you may experience problems.