Junos Operational Mode Command for Displaying Root Bridge ID

B

The command that displays the root bridge ID for a Junos device is "show spanning-tree root".

Explanation:

The Spanning Tree Protocol (STP) is used in a network to prevent loops and ensure that there is only one active path between any two nodes. STP uses a root bridge as a reference point to calculate the shortest path to every other bridge in the network.

To display the root bridge ID for a Junos device, you can use the "show spanning-tree root" command in operational mode. This command shows the current root bridge ID, the bridge priority, and the root path cost.

Example:

sqlCopy code
user@switch> show spanning-tree root  Spanning tree root ID is 32768:00:05:00:1e:e0 (priority 32768) Root path cost 0 Root port 44 (ae0.0) 

In the output above, the root bridge ID is shown as "32768:00:05:00:1e:e0" with a priority of 32768. The root path cost is 0, which means that the root bridge is directly connected to the switch. The root port is shown as port 44, which is part of aggregated Ethernet interface ae0.0.