Multicast Route Distribution in Multitenant Data Center Fabric
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current BGP route distribution mechanisms in Vinci architecture do not scale well for multicast routes, leading to inefficiencies in route updates and routing table entries, particularly in large multitenant environments.
Innovation Solution
Implementing a method where RBridges advertise their route target memberships based on connectivity to virtual networks and distribution tree topologies, using attributes like RT Membership Type and Distribution Tree Binding to optimize multicast route distribution, and enabling the ADD-PATH capability to share RT membership information among RBridges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BGP route distribution mechanisms are used in Vinci architecture for multicast routes, then route distribution among leaf switches is enabled, but the system does not scale well in large multitenant environments leading to inefficiencies in route updates and routing table entries
Solution Approach 1:
The patent segments the route distribution process by introducing a route reflector that selectively reflects multicast routes based on route target membership. This divides the monolithic BGP route distribution into controlled segments, allowing scalability in large multitenant environments by preventing all leaf switches from receiving all multicast routes.
Solution Approach 2:
The patent applies local quality by enabling each RBridge to advertise its route target membership with specific attributes indicating whether it is an endpoint or transit node. This allows differentiated route distribution where only relevant routes are propagated to specific nodes, improving scalability while maintaining appropriate route distribution complexity at each location.
2Reliability
If all multicast routes are distributed to all RBridges, then complete route information is available, but the number of routing table entries increases significantly reducing scalability
Solution Approach 1:
The patent extracts only the necessary route information by implementing selective route reflection based on route target membership. The route reflector extracts and reflects only those multicast routes relevant to each RBridge's endpoint or transit status, maintaining route information completeness for needed routes while removing unnecessary routes that would bloat routing tables.
Solution Approach 2:
Instead of having each RBridge receive all routes and then filter locally, the system inverts the approach by having the route reflector perform centralized filtering based on advertised route target memberships. This inversion maintains reliability of route information for needed routes while dramatically improving scalability by preventing unnecessary route propagation.
3Productivity
If RBridges advertise RT membership with detailed attributes, then multicast pruning efficiency is enhanced, but the complexity of route advertisements increases
Solution Approach 1:
The patent applies parameter changes by introducing specific BGP attributes (endpoint/transit node indicators) to route target membership advertisements. These parameter changes enable enhanced multicast pruning efficiency by allowing RBridges to make informed decisions about route propagation based on the advertised attributes, while the attribute structure remains standardized to manage complexity.
Data Source
AI summary
A method is provided in one example embodiment and includes determining a route target (“RT”) membership for a network element; determining at least one attribute for the RT membership; and advertising the RT membership with the at least one attribute to other network elements. The at least one attribute may include an RT membership type attribute for indicating whether the RT membership is due to a local virtual network connection, transit support, or both. Additionally or alternatively, the at least one attribute may include a distribution tree binding attribute for indicating a distribution tree for the RT membership.