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OSPF Cost Calculation
Because cost components can change rapidly, it might be necessary to dampen the volume of changes to reduce network-wide churn. The recommended values for S2, S3, and S4 are based on network simulations that may reduce the rate of network changes. The recommended value for S1 is zero to eliminate this variable from the route cost calculation.
The overall link cost is computed using the following formula shown in Figure 1.
Figure 1 Overall Link Cost Formula
Table 1 defines the symbols used in the OSPF cost calculation.
OSPF Cost Calculation
Because cost components can change rapidly, it might be necessary to dampen the volume of changes to reduce network-wide churn. The recommended values for S2, S3, and S4 are based on network simulations that may reduce the rate of network changes. The recommended value for S1 is zero to eliminate this variable from the route cost calculation.
The overall link cost is computed using the following formula shown in Figure 1.
Figure 1 Overall Link Cost Formula
Table 1 defines the symbols used in the OSPF cost calculation.
Table 1 OSPF Cost Calculation Definitions
OC : The "default OSPF cost." Calculated from reference bandwidth using reference_bw / (MDR*1000), where reference_bw=10^8.
A through D :Various radio-specific data-based formulas that produce results in the 0 through 64,000 range.
A :CDR- and MDR-related formula: (2^16 * (100 - (CDR * 100 /MDR)))/100
B :Resources related formula: ((100 - RESOURCES)^3 * 2^16 / 10^6)
C :Latency as reported by the radio, already in the 0 through 64K range when reported (LATENCY).
D :RLF-related formula: ((100 - RLF) * 2^16)/100
S1 through S4 :Scalar weighting factors input from the command-line interface (CLI). These scalars scale down the values as computed by A through D.
Trích:http://www.cisco.com/en/US/docs/ios/...html#wp1069919
Thanks !
OC : The "default OSPF cost." Calculated from reference bandwidth using reference_bw / (MDR*1000), where reference_bw=10^8.
A through D :Various radio-specific data-based formulas that produce results in the 0 through 64,000 range.
A :CDR- and MDR-related formula: (2^16 * (100 - (CDR * 100 /MDR)))/100
B :Resources related formula: ((100 - RESOURCES)^3 * 2^16 / 10^6)
C :Latency as reported by the radio, already in the 0 through 64K range when reported (LATENCY).
D :RLF-related formula: ((100 - RLF) * 2^16)/100
S1 through S4 :Scalar weighting factors input from the command-line interface (CLI). These scalars scale down the values as computed by A through D.
Trích:http://www.cisco.com/en/US/docs/ios/...html#wp1069919
Thanks !