Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 344

• Modify the max-age (in seconds) in CONFIGURATION mode, from 6 to 40, default 20. spanning-tree vlan vlan-id max-age seconds View RPVST+ global parameters OS10# show spanning-tree active Spanning tree enabled protocol rapid-pvst with force-version rstp VLAN 1 Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32769, Address 90b1.1cf4.a523 Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 32769, Address 90b1.1cf4.a523 We are the root of VLAN 1 Configured hello time 2, max age 20, forward delay 15 Setting spanning-tree link type for rapid state transitions As specified in IEEE 802.1w, OS10 assumes a port that runs in full duplex mode as a point-to-point link. A point-to-point link transitions to forwarding state faster. By default, OS10 derives the link type of a port from the duplex mode. You can override the duplex mode using the spanning-tree link-type command. As half-duplex mode is considered as a shared link, the fast transition feature is not applicable for shared links. If you designate a port as a shared link, you cannot use the fast transition feature, regardless of the duplex setting. To fasten the spanning-tree state transitions, you can set the link type to point-to-point. To set the link type to point-to-point: • Use the following command in INTERFACE mode. spanning-tree link-type point-to-point MAC flush optimization OS10 offers a MAC address clearing technique that optimizes the number of MAC flush calls sent by the Spanning Tree Protocol (STP) module. For more information about this feature, see MAC flush optimization. RPVST allows (VLAN, port) based flush until the number of calls sent is equal to the MAC flush threshold value that is configured. When the number of calls sent exceeds the configured threshold, RPVST ignores further (VLAN, port) based flush and starts the MAC flush timer. When the timer starts, the system blocks further flush. When the timer expires for that specific instance, the system triggers VLAN-based flushing. By default, the MAC flush threshold value is set to 5. However, Dell EMC recommends that you configure this value based on the number of ports that participate in the STP topology. RPVST+ commands clear spanning-tree counters Clears the counters for STP. Syntax clear spanning-tree counters [interface {ethernet node/slot/port[:subport] | port-channel number}}] 344 Layer 2