cost-style

Function

The cost-style command sets the cost style of routes received and sent by an IS-IS device.

The undo cost-style command restores the default cost style of routes received and sent by an IS-IS device.

By default, the cost style of routes received and sent by an IS-IS device is narrow.

Format

cost-style { narrow | wide | wide-compatible | { compatible | narrow-compatible } [ relax-spf-limit ] }

undo cost-style

Parameters

Parameter	Description	Value
narrow	Configures an IS-IS device to receive and send only routes with cost style narrow. When the cost style is narrow, the cost of routes ranges from 1 to 63.	-
wide	Configures an IS-IS device to receive and send only routes with cost style wide. When the cost style is wide, the cost of routes ranges from 1 to 16777215.	-
wide-compatible	Configures an IS-IS device to receive routes with cost style narrow or wide and sent only routes with cost style wide.	-
compatible	Configures an IS-IS device to receive and send routes with cost style narrow or wide.	-
narrow-compatible	Configures an IS-IS device to receive routes with cost style narrow or wide and sent only routes with cost style narrow.	-
relax-spf-limit	Configures an IS-IS device to receive routes with cost higher than 1023. If this parameter is specified, there is no restriction on the link costs of interfaces or route costs. The cost of a received route is the actual cost. If this parameter is not specified, the following situations occur: If the cost of a route is smaller than or equal to 1023, and the link cost of each interface through which the route passes is smaller than or equal to 63: The cost of the route is the sum of link costs of all interfaces through which the route passes. If the cost of a route is smaller than or equal to 1023, and the link costs of certain interfaces through which the route passes are larger than 63: An IS-IS device can learn only the routes imported by the interfaces and direct routes of the network segment where the interfaces reside. The costs of these routes are the actual cost. If the cost of a route is larger than 1023: The device can receive only the routes of the network segment where the interface with link cost smaller than 1023 resides. If the cost of a route is larger than 1023, the cost is calculated as 1023.	-

Views

IS-IS view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

By default, the cost style of IS-IS routes is narrow, indicating that only routes with the cost ranging from 1 to 63 can be received and sent. LSPs carrying tag information to be filtered by a routing policy cannot be flooded when the cost style is narrow. The cost-style command can be used to change the cost style of IS-IS routes so that they can be transmitted successfully.

To implement extended IS-IS functions, setting the cost style of IS-IS routes to wide is recommended.

Precautions

When the cost style of a route is changed from wide to narrow, transmission of the route may be interrupted.

If you want to change the cost style of IS-IS routes, running the command while configuring basic IS-IS functions is recommended. If the cost style of IS-IS routes is changed during network operation, the IS-IS process is restarted and neighbors are disconnected.

Example

# Configure an IS-IS device to send only the packets with cost style narrow and to receive the packets with cost style narrow or wide.

<HUAWEI> system-view

[HUAWEI] isis 1

[HUAWEI-isis-1] cost-style narrow-compatible