The auto-cost enable command enables the system to calculate the cost of an interface based on the bandwidth of the interface automatically.
The undo auto-cost enable command disables the function.
By default, automatic calculation of the cost is disabled.
| Parameter | Description | Value |
|---|---|---|
| compatible | Specifies the IS-IS to calculate the cost of an interface based on the bandwidth of the interface automatically in compatible. |
- |
Configuration Impact
After this command is run, if the cost of an IS-IS interface is not set in the interface view and no cost is set in the IS-IS view, IS-IS topology view, or IS-IS IPv6 topology view, the system automatically calculates a cost for the interface.
If the cost style of the system is wide or wide-compatible, the system calculates the cost of each interface based on the following formula:
Interface cost = (Bandwidth-reference/Interface bandwidth) x 10.
If the cost style of the system is narrow, narrow-compatible or compatible, the cost of each interface is based on the following table.
Cost |
Range of the Interface Bandwidth |
|---|---|
60 |
Interface bandwidth =< 10 Mbit/s |
50 |
10 Mbit/s < Interface bandwidth =< 100 Mbit/s |
40 |
100 Mbit/s < Interface bandwidth =< 155 Mbit/s |
30 |
155 Mbit/s < Interface bandwidth =< 622 Mbit/s |
20 |
622 Mbit/s < Interface bandwidth =< 2.5 Gbit/s |
10 |
2.5 Gbit/s < Interface bandwidth |
Precautions
The auto-cost enable command cannot change the cost of the loopback interface.
The auto-cost enable command can be run on Eth-Trunk interfaces as same with on physical interfaces. If the command is run on an Eth-Trunk interface, the bandwidth of the Eth-Trunk interface is equal to the total bandwidth of all its member interfaces.