While designing a Layer 2 distribution switch, a customer inquires about the ability to tune Spanning Tree Protocol timers. What is a valid timer for RSTP?

The correct answer is D. hello. In RSTP (IEEE 802.1w), the hello timer is the primary timer - it controls the interval at which BPDUs are sent (default 2 seconds) and is directly configurable for tuning RSTP behavior. RSTP fundamentally changes convergence compared to classic STP: it uses a proposal/agreement…

Advanced Enterprise Campus Networks

Question

Options

Aforward delay
Bmax AGE
Cstandby
Dhello

How the community answered

(28 responses)

A
7% (2)
C
4% (1)
D
89% (25)

Explanation

In RSTP (IEEE 802.1w), the hello timer is the primary timer - it controls the interval at which BPDUs are sent (default 2 seconds) and is directly configurable for tuning RSTP behavior. RSTP fundamentally changes convergence compared to classic STP: it uses a proposal/agreement handshake mechanism rather than relying on forward delay and max age timers for state transitions. Forward delay (A) and max age (B) are STP timers retained in RSTP for backward compatibility with legacy STP bridges, but they are not the timers RSTP uses for its own rapid convergence. 'Standby' (C) is not an STP or RSTP timer - it is a state in HSRP/VRRP (gateway redundancy protocols).

Topics

#RSTP#STP timers#hello timer#spanning tree

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