apply preferred-value

Function

The apply preferred-value command sets the preferred value for BGP routes.

The undo apply preferred-value command cancels the configuration.

By default, the preferred value of BGP routes is not set.

Format

apply preferred-value preferredVal

undo apply preferred-value

Parameters

Parameter	Description	Value
preferredVal	Specifies the preferred value of BGP routes. In route selection, the BGP route with the largest preferred value is preferred.	The value is an integer ranging from 0 to 65535.

Parameter

Description

Value

preferredVal

Specifies the preferred value of BGP routes. In route selection, the BGP route with the largest preferred value is preferred.

The value is an integer ranging from 0 to 65535.

Views

Route-policy view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
route-base	write

Usage Guidelines

Usage Scenario

The preferred value is a proprietary attribute of BGP. You can use the apply preferred-value command to set the preferred value for a BGP route in the import policy.

Run the route-policy command to enter the Route-policy view.
A route-policy may consist of multiple nodes. The relationship between the nodes is "OR". The system matches a route against the nodes in sequence. If the route matches a node, the route matches the route-policy, and the system no longer matches it against other nodes.
Each node comprises a set of if-match and apply clauses. The if-match clauses define the filtering rules that are used to match certain route attributes. The relationship among if-match clauses of the same node that are based on different route attributes is AND. A route matches a node only when the route matches all the filtering rules specified in the if-match clauses of the node. The apply clauses specify actions. The relationship among if-match clauses of the same node that are based on the same route attribute is OR. The system matches routes against the if-match clauses in order. If a route matches an if-match clause, the system no longer matches the route against the rest if-match clauses. For example, the if-match community-filter 1 and if-match as-path-filter 1 configurations in node 10 are based on different route attributes. Therefore, the relationship among if-match clauses of this node is AND. The if-match community-filter 1 and if-match community-filter 2 configurations in node 20 are both based on the community attribute. Therefore, the relationship among if-match clauses of this node is OR. The apply clauses specify actions. If a route matches a node, the apply clauses set some attributes for the route.

Prerequisites

A route-policy has been configured using the route-policy command.

Configuration Impact

After a BGP route matches a route-policy, the preferred value for the BGP route is set.

Precautions

The preferred value of a route indicates its weight in BGP routing. It has only local significance and is not a standard protocols-defined attribute. The preferred value is inapplicable to export policies of BGP.

Example

# Set the preferred value for BGP routes.

<HUAWEI> system-view
[~HUAWEI] route-policy policy permit node 10
[*HUAWEI-route-policy] apply preferred-value 66