300-320 · Question #353
When designing a layer 2 STP-based LAN with Layer 3 FHRP, which design recommendation should be followed?
The correct answer is D. Align the STP root with the active FHRP device. The STP root bridge and the active FHRP gateway (HSRP/VRRP/GLBP active router) must be the same physical switch. If they are on different switches, end-host traffic destined for the default gateway flows toward the FHRP active switch, but STP may be forwarding traffic through…
Question
When designing a layer 2 STP-based LAN with Layer 3 FHRP, which design recommendation should be followed?
Options
- AAvoid modifying default STP and FHRP timers.
- BAssign the native VLAN to the lowest number in use.
- CAvoid configuring router preemption.
- DAlign the STP root with the active FHRP device.
How the community answered
(38 responses)- A5% (2)
- B3% (1)
- C13% (5)
- D79% (30)
Explanation
The STP root bridge and the active FHRP gateway (HSRP/VRRP/GLBP active router) must be the same physical switch. If they are on different switches, end-host traffic destined for the default gateway flows toward the FHRP active switch, but STP may be forwarding traffic through the other switch (the STP root), creating a suboptimal, asymmetric path with unnecessary hops. Aligning STP root with the FHRP active router ensures all traffic takes the shortest logical path.
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