Configuring the BGP Large-Community Attribute

The Large-Community attribute can be used to flexibly apply route-policies.

Usage Scenario

The Large-Community attribute can represent a 2-byte or 4-byte Autonomous System Number (ASN), and has two 4-byte LocalData IDs. The administrator can therefore apply route-policies more flexibly. The Large-Community attribute extends and can be used together with a community attribute.

Pre-configuration Tasks

Before configuring the BGP Large-Community attribute, configure basic BGP functions.

Configuring a Route-Policy Related to the Large-Community Attribute: Before configuring the Large-Community attribute for routes, configure a route-policy in which the Large-Community attribute is applied.

Advertising the Large-Community Attribute: The Large-Community values defined in a route-policy take effect only after the Large-Community attribute is advertised to a peer or peer group.

Verifying the Large-Community Configuration: After configuring the BGP Large-Community attribute, verify the configuration.