HP Mellanox SX1018 Mellanox MLNX-OS®Command Reference Guide for SX101 - Page 347

Rev 1.6.9 spanning-tree cost spanning-tree cost no spanning-tree cost Configures the interface cost of the spanning tree. The no form of the command returns configuration to its default. Syntax Description port cost Sets the spanning tree cost of an interface. Value range is 0-200000000. Default The default cost is derived from the speed. 1Gbps 20000 10Gbps 2000 40Gbps 500 56Gbps 357 Configuration Mode Config Interface Ethernet History 3.1.0000 Role admin Example switch (config) # interface ethernet 1/1 switch (config interface ethernet 1/1) # spanning-tree cost 1000 switch (config interface ethernet 1/1) # Related Commands show spanning-tree Note • LAG default cost is calculated by dividing the port speed by the number of active links in UP state. For example: if there were 4 links in the LAG out of which only two are in UP state, assuming the port speed is 10Gbps, the LAG cost will be 2000/2 = 1000. • When configuring the cost for a LAG, the cost will be fixed to this configuration, no matter what the number of active links (UIP state) in the LAG is • Unstable network may cause the LAG cost to change dynamically assuming the cost parameter is not configured for anything else other than default Mellanox Technologies 347 Mellanox® Technologies Confidential