Cisco CCNP / BCMSN Exam Tutorial: Spanning Tree Protocol (STP) Timers
In your BCMSN / CCNP exam study, it’s easy to overlook some of the details of Spanning Tree Protocol (STP). After all, you learned all of that in your CCNA studies, right? Not necessarily! While some of the BCMSN material will be a review for you, there are some details regarding familiar topics that you need to learn. That includes the timers for STP – Hello Time, MaxAge, and Forward Delay.
You may remember these timers from your CCNA studies as well, and you should also remember that these timers should not be changed lightly. What you might not have known is that if you decide to change any and all of these timers, that change must be configured on the root bridge! The root bridge will inform the nonroot switches of the change via BPDUs.
Hello Time is the interval between BPDUs, two seconds by default.
Forward Delay is the length of both the listening and learning STP stages, with a default value of 15 seconds.
Maximum Age, referred to by the switch as MaxAge, is the amount of time a switch will retain a BPDU’s contents before discarding it. The...
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