Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 1080

Adding an Interface to the Spanning Tree Group To add a Layer 2 interface to the spanning tree topology, use the following command. • Enable spanning tree on a Layer 2 interface. INTERFACE mode spanning-tree 0 To remove a Layer 2 interface from the spanning tree topology, enter the no spanning-tree 0 command. Modifying Global Parameters You can modify the spanning tree parameters. The root bridge sets the values for forward-delay, hello-time, and max-age and overwrites the values set on other bridges participating in STP. NOTE: Dell Networking recommends that only experienced network administrators change the spanning tree parameters. Poorly planned modification of the spanning tree parameters can negatively affect network performance. The following table displays the default values for STP. Table 88. STP Default Values STP Parameters Default Value Forward Delay 15 seconds Hello Time 2 seconds Max Age 20 seconds Port Cost • 100-Mb/s Ethernet interfaces • 1-Gigabit Ethernet interfaces • 10-Gigabit Ethernet interfaces • Port Channel with 100 Mb/s Ethernet interfaces • Port Channel with 1-Gigabit Ethernet interfaces • Port Channel with 10-Gigabit Ethernet interfaces • 19 •4 •2 • 18 •3 •1 Port Priority 8 • Change the forward-delay parameter (the wait time before the interface enters the Forwarding state). PROTOCOL SPANNING TREE mode forward-delay seconds Spanning Tree Protocol (STP) 1080