You can add, edit and remove port members of each trunk and then press "Apply" button after you have finished configuring the trunks you need.

( Note: Make sure trunking ports are in the same VLAN group. )

3.9 STP (Spanning Tree Protocol)

Spanning tree is a link management protocol that provides path redundancy while preventing undesirable loops in the network. For Layer 2 Ethernet network to function properly, only one active path must exist between two stations.

The spanning-tree algorithm calculates the best loop-free path throughout a switched network. STP forces redundant data paths into a standby (blocked) state. If a network segment in the spanning tree fails and a redundant path exists, the spanning-tree algorithm recalculates the spanning tree topology and activates the standby path.

Figure 3-8 The STP page

If you want to participate in spanning tree, have the "Enable Spanning Tree Protocol" checkbox selected.

The Current Spanning Tree Root describes the unique root switch information for the instance of spanning tree.

MAC Address: the MAC address of the root switch

Root Max Age: the amount of time (in seconds) protocol information received on a port is stored by the root switch

Root Hello Time: how often the root switch broadcasts Hello message to other switches

Root Forward Delay: the amount of time a port will remain in the listening and learning states before entering the forwarding state

Root Path Cost: the path cost to the root switch from this switch

Root Port: the port providing the best path from the switch to the root switch

The Spanning Tree Bridge Configuration describes this switch information in the spanning tree.

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