H3C Technologies H3C S12500 Series Switches - Manual (Page 30)

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Step Command Remarks
3. Set a port-specific link metric
value.
spbm cost value
By default, automatic link metric
calculation applies.
Setting the global link metric value
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter SPBM view. spbm N/A
3. Set a global SPBM link
metric value.
circuit-cost value
By default, no global SPBM link metric
value is configured.
Configuring the bandwidth reference for automatic link metric calculation
ISIS-SPB automatically calculates a link metric value for an interface if both the global and
interface-specific link metric value are not configured.
The following is the calculation formula:
Link metric value=(Reference bandwidth/Real bandwidth)x10
The value range for the link metric value is 1 to 16777214.
To configure the bandwidth reference for automatic link metric calculation:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter SPBM view. spbm N/A
3. Configure the reference
bandwidth for automatic link
metric calculation.
bandwidth-reference value
The default bandwidth
reference is 40 Gbps.
Mapping B-VLANs to an ECT algorithm
An ECT algorithm represents a set of tie-breakers for calculating SPTs.
To improve link efficiency in an SPBM network, you can distribute B-VLAN traffic along different paths by
mapping B-VLANs to different ECT algorithms.
To ensure correct SPT calculation for a B-VLAN, the B-VLAN to ECT algorithm mappings must be the same
across the SPBM network for B-VLANs.
For more information about the ECT algorithms, see IEEE 802.1aq SPB.
To map a list of B-VLANs to an ECT algorithm:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter SPBM view. spbm N/A