HP Cisco MDS 9020 Cisco Nexus 5000 Series Command Reference Release 4.0(1a)N2( - Page 215

Chapter 2 Ethernet Commands spanning-tree mst root Send comments to [email protected] spanning-tree mst root To designate the primary and secondary root and set the timer value for an instance, use the spanning-tree mst root command. To return to the default settings, use the no form of this command. spanning-tree mst instance-id root {primary | secondary} [diameter dia [hello-time hello-time]] no spanning-tree mst instance-id root Syntax Description instance-id primary secondary diameter dia hello-time hello-time Instance identification number; the range of valid values is from 0 to 4094. Specifies the high priority (low value) that is high enough to make the bridge root of the spanning-tree instance. Specifies the switch as a secondary root, should the primary root fail. (Optional) Specifies the timer values for the bridge that are based on the network diameter. (Optional) Specifies the duration between the generation of configuration messages by the root switch. The range is from 1 to 10 seconds; the default is 2 seconds. Command Default None Command Modes Configuration mode Command History Release 4.0(0)N1(1a) Modification This command was introduced. Usage Guidelines You can enter the instance-id argument as a single instance or a range of instances, for example, 0-3,5,7-9. If you do not specify the hello-time argument, the argument is calculated from the network diameter. You must first specify the diameter dia keyword and argument before you can specify the hello-time hello-time keyword and argument. Examples This example shows how to designate the primary root: switch(config)# spanning-tree mst 0 root primary This example shows how to set the priority and timer values for the bridge: switch(config)# spanning-tree mst 0 root primary diameter 7 hello-time 2 OL-16599-01 Cisco Nexus 5000 Series Command Reference 2-67