# Why is it important that the network administrator consider the spanning-tree network diameter when choosing the root bridge?

IT Questions BankCategory: CCNA 3 v4Why is it important that the network administrator consider the spanning-tree network diameter when choosing the root bridge?

Why is it important that the network administrator consider the spanning-tree network diameter when choosing the root bridge?

• BPDUs may be discarded because of expiring timers.
• The network diameter limitation is 9.
• The cabling distance between the switches is 100 meters.
• Convergence is slower as the BPDU travels away from the root.

Explanation: The optional diameter keyword in the spanning-tree vlan vlan-id root {primary | secondary} [diameter diameter] command allows for tuning of the STP convergence. The diameter keyword should reference the maximum number of Layer 2 hops that a switch can be from the root bridge and modify the timers accordingly. The timers do not need to be modified on other switches because they are carried throughout the topology through the root bridge BPDUs.

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