Configuring BGP4+ Routing Policies

BGP4+ routing policies can be configured to flexibly control the sending and receiving of routes.

Usage Scenario

Routing policies can set or re-set BGP4+ route attributes using some predefined conditions, which provides a flexible and effective method to control BGP4+ route selection. The sending and receiving of routes can be flexibly controlled by applying BGP4+ routing policies.

Based on the import (or export) routing policy specified by the peer, the associated import (or export) routing conditions (if-match clauses) can be configured to filter routes, and apply clauses can be configured to set or modify route attributes. The routes that match the routing policy will be received (or sent).

Pre-configuration Tasks

Before configuring BGP4+ routing policies, complete the following tasks:

Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
Configure basic BGP4+ Functions.

Configuring Related BGP4+ Access Lists: BGP4+ access lists can be used when BGP4+ status is displayed or routing policies are configured.

Configuring a Route-Policy: A route-policy is used to match routes or route attributes, and to change route attributes when the matching rules are met.

Configuring a Policy for Advertising BGP4+ Routes: If BGP4+ is configured to filter imported routes, only the routes that meet the matching rules are added to the local BGP4+ routing table and advertised to BGP4+ peers.

Configuring a Policy for Receiving BGP4+ Routes: BGP4+ filters received routes using a policy. Only the routes that match the policy can be added to a routing table.

Configuring BGP4+ Soft Reset: BGP4+ soft reset allows the system to refresh a BGP4+ routing table dynamically without tearing down any BGP4+ connection if routing policies are changed.

Verifying the Configuration: After configuring BGP4+ routing policies, check routes that are advertised and received by BGP4+.