Spanning-tree from the view point of DL-1 and DL2
- The interface associated to lowest path cost is more preferred.
- The interface associated to the lowest system priority of the advertising switch is preferred next.
- The interface associated to the lowest system MAC address of the advertising switch is preferred next.
- When multiple links are associated to the same switch, the lowest port priority from the advertising switch is preferred.
- When multiple links are associated to the same switch, the lower port number from the advertising switch is preferred.
DL-1
![](https://www.netprojnetworks.com/wp-content/uploads/2020/05/image-19.png)
![](https://www.netprojnetworks.com/wp-content/uploads/2020/05/image-17.png)
![](https://www.netprojnetworks.com/wp-content/uploads/2020/05/image-20.png)
DL-2
![](https://www.netprojnetworks.com/wp-content/uploads/2020/05/image-23.png)
![](https://www.netprojnetworks.com/wp-content/uploads/2020/05/image-24.png)
![](https://www.netprojnetworks.com/wp-content/uploads/2020/05/image-25.png)