During a planned network maintenance window, an administrator installs a new central switch (Switch-Core) to serve as the core switching node. After connecting Switch-Core to the access switches, network traffic follows sub-optimal paths across the campus topology. Troubleshooting reveals that an old edge switch (Switch-Access-3) with a configured Spanning Tree Protocol (STP) bridge priority of 4096 has been elected as the STP root bridge because Switch-Core is using the default STP priority of 32768. Which configuration change on Switch-Core will resolve this issue and establish Switch-Core as the STP root bridge?
- Configure the STP bridge priority value on Switch-Core to a number lower than 4096, such as 0 or 2048.Cevap
- BIncrease the STP bridge priority value on Switch-Core to 65535 to give it the highest election weight.
- CChange the native VLAN on all Switch-Core trunk ports to match Switch-Access-3 so STP BPDUs can be processed.
- DConfigure static inter-VLAN routing on Switch-Access-3 to bypass the Spanning Tree Protocol root bridge election.
Cevap
Configure the STP bridge priority value on Switch-Core to a number lower than 4096, such as 0 or 2048.
In 802.1D and 802.1w Spanning Tree Protocol, the switch with the lowest Bridge ID (BID) is elected as the root bridge. The BID begins with the bridge priority field. Because Switch-Access-3 has a priority of 4096 and Switch-Core is at the default value of 32768, Switch-Access-3 wins the election. Assigning Switch-Core a bridge priority lower than 4096 (such as 0 or 2048) guarantees it has the lowest BID and becomes the root bridge.
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STP Root Bridge Priority Election