Dell MX9116n EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 533

Supported Releases 10.4.0E(R1) or later spanning-tree rstp max-age Configures the time period the bridge maintains configuration information before refreshing the information by recomputing the RSTP topology. Syntax Parameters Default Command Mode Usage Information Example max-age seconds seconds - Enter a maximum age value in seconds, from 6 to 40. 20 seconds CONFIGURATION None OS10(config)# spanning-tree rstp max-age 10 Supported Releases 10.2.0E or later spanning-tree rstp priority Sets the priority value for RSTP. Syntax Parameters Default Command Mode Usage Information Example spanning-tree rspt priority priority value priority priority value - Enter a bridge-priority value in increments of 4096, from 0 to 61440. Valid priority values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440. All other values are rejected. Not configured CONFIGURATION RSTP determines the root bridge but you can assign one bridge a lower priority to increase the probability of it being the root bridge. A lower priority value increases the probability of the bridge becoming a root bridge. OS10(config)# spanning-tree rstp priority 5002 Supported Releases 10.2.0E or later Multiple Spanning-Tree MSTP is one of the variations of the rapid spanning-tree protocol that mitigates some of the challenges of Rapid-PVST. RapidPVST allows a spanning-tree instance for each VLAN. This 1:1 approach is not suitable if you have multiple VLANs - each spanning-tree instance costs bandwidth and processing resources. You can configure Multiple Spanning-Tree Instances (MSTIs) and map multiple VLANs to one spanning-tree instance to reduce the total number of instances.. When you enable MST, all ports in Layer 2 (L2) mode participate in all instances of MST. OS10 only supports one MST region. You can achieve load balancing using the MST protocol (MSTP). For example, as shown in the following figure, when you map three VLANs to two multiple spanning-tree instances (MSTIs), VLAN 100 traffic takes a different path than VLAN 200 and 300 traffic. Layer 2 533