Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 723

• Disable spanning tree on the interface (the no spanning-tree command in INTERFACE mode). • Disable global spanning tree (the no spanning-tree command in CONFIGURATION mode). To enable EdgePort on an interface, use the following command. • Enable EdgePort on an interface. INTERFACE mode spanning-tree rstp edge-port [bpduguard | shutdown-on-violation] Example of Verifying an EdgePort is Enabled on an Interface To verify that EdgePort is enabled on a port, use the show spanning-tree rstp command from EXEC privilege mode or the show config command from INTERFACE mode. NOTE: Dell Networking recommends using the show config command from INTERFACE mode. In the following example, the bold line indicates that the interface is in EdgePort mode. Dell(conf-if-te-2/1)#show config ! interface TenGigabitEthernet 2/1 no ip address switchport spanning-tree rstp edge-port shutdown Dell(conf-if-te-2/1)# Configuring Fast Hellos for Link State Detection Use RSTP fast hellos to achieve sub-second link-down detection so that convergence is triggered faster. The standard RSTP link-state detection mechanism does not offer the same low link-state detection speed. To achieve sub-second link-down detection so that convergence is triggered faster, use RSTP fast hellos. The standard RSTP link-state detection mechanism does not offer the same low link-state detection speed. RSTP fast hellos decrease the hello interval to the order of milliseconds and all timers derived from the hello timer are adjusted accordingly. This feature does not inter-operate with other vendors, and is available only for RSTP. • Configure a hello time on the order of milliseconds. PROTOCOL RSTP mode hello-time milli-second interval The range is from 50 to 950 milliseconds. Example of Verifying Hello-Time Interval Dell(conf-rstp)#do show spanning-tree rstp brief Executing IEEE compatible Spanning Tree Protocol Root ID Priority 0, Address 0001.e811.2233 Root Bridge hello time 50 ms, max age 20, forward delay 15 Bridge ID Priority 0, Address 0001.e811.2233 We are the root Configured hello time 50 ms, max age 20, forward delay 15 NOTE: The hello time is encoded in BPDUs in increments of 1/256ths of a second. The standard minimum hello time in seconds is 1 second, which is encoded as 256. Millisecond. hello times are encoded using values less than 256; the millisecond hello time equals (x/1000)*256. When you configure millisecond hellos, the default hello interval of 2 seconds is still used for edge ports; the millisecond hello interval is not used. Rapid Spanning Tree Protocol (RSTP) 723