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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Why Cannot Interfaces of Different Types Generate Equal-Cost Routes and Establish OSPF Load Balancing?

Why Cannot Interfaces of Different Types Generate Equal-Cost Routes and Establish OSPF Load Balancing?

OSPF can automatically calculate the cost of an interface based on the interface bandwidth. The calculation formula is: Interface cost = Bandwidth reference value/Interface bandwidth. The bandwidth reference value is configurable. The default value is 100 Mbit/s. Routes generated by OSPF have the same priority (10 by default). The interface cost, however, depends on the interface type. Interfaces of different types have different costs; therefore, the interfaces cannot generate equal-cost routes, leading to failure in establishing load balancing.

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Updated: 2019-05-17

Document ID: EDOC1000174069

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