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Configuring BGP-LS
Usage Scenario
Without BGP-LS, the switch uses an IGP (OSPF or IS-IS) to collect topology information of each AS, and the IGP reports the information to the controller. This topology information collection method has the following disadvantages:
- The controller must have high computing capabilities and support the IGP and its algorithm.
- The controller cannot gain the complete inter-AS topology information and therefore is unable to calculate optimal E2E paths.
- Different IGPs report topology information separately to the controller, which complicates the controller's analysis and processing.
With powerful routing capabilities of BGP, BGP-LS provides a simple and efficient method of collecting topology information and has the following advantages:
- Reduces computing capability requirements and spares the necessity of IGPs on the controller.
- Facilitates route selection and calculation on the controller by using BGP to summarize process or AS topology information and report the complete information to the controller.
- Requires only one routing protocol (BGP) to report topology information to the controller.
BGP-LS needs to be deployed on the controller and the devices connected to it.
Pre-configuration Tasks
Before configuring BGP-LS, configure basic IS-IS functions or configure basic OSPF functions.