Command Manual (For Soliton) – MSTPH3C S3100 Series Ethernet Switches Chapter 1 MSTP Configuration Commands1-21Parametersinstance-id: ID of an MSTI ranging from 0 to 16. The value of 0 refers to the CIST.cost: Path cost to be set for the port. The range of the cost argument varies with thestandard used for calculating the default path cost of a port as follows:z With the IEEE 802.1D-1998 standard selected, the path cost of an Ethernet portranges from 1 to 65535.z With the IEEE 802.1t standard selected, the path cost of an Ethernet port rangesfrom 1 to 200000000.z With the proprietary standard selected, the path cost of an Ethernet port rangesfrom 1 to 200000.DescriptionUse the stp cost command to set the path cost of the current port in a specified MSTI.Use the undo stp cost command to restore the default path cost of the current port inthe specified MSTI.By default, a switch automatically calculates the path costs of a port in different MSTIsbased on a specified standard.If you specify the instance-id argument to be 0 or do not specify this argument, the stpcost command sets the path cost of the port in CIST.The path cost of a port affects its port role. By configuring different path costs for thesame port in different MSTIs, you can make flows of different VLANs travel alongdifferent physical links, so as to achieve VLAN-based load balancing. Changing thepath cost of a port in an MSTI may change the role of the port in the instance and put itin state transition.Related commands: stp interface cost.Examples# Set the path cost of Ethernet 1/0/3 in MSTI 2 to 200. system-viewSystem View: return to User View with Ctrl+Z.[Sysname] interface Ethernet 1/0/3[Sysname-Ethernet1/0/3] stp instance 2 cost 2001.1.19 stp dot1d-trapSyntaxstp dot1d-[ instance instance-id ] trap [ newroot | topologychange ] enableundo stp [ instance instance-id ] dot1d-trap [ newroot | topologychange ] enable
