Remote Path Selection Logic for Core Router Traffic Control
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Solution Overview
Problem
Network operators face a trade-off between controlling traffic routing and scalability when deploying traffic engineered paths in telecommunications networks, as deploying paths between edge routers provides control but leads to scalability issues, while deploying paths between core routers avoids scalability issues but loses control over routing certain traffic.
Innovation Solution
Implementing remote path selection logic that allows network operators to associate forwarding path preferences with packets, enabling the selection of specific paths while maintaining control over routing certain traffic, even when deploying only a small number of traffic engineered paths between core routers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traffic engineered paths are deployed between edge routers, then control over routing certain traffic to particular paths is improved, but scalability issues worsen due to high number of paths required
Solution Approach 1:
The patent introduces a new dimension of path selection by deploying traffic engineered paths between core routers rather than edge routers. This dimensional shift in the network architecture allows control to be exercised at the core level through remote path selection, reducing the number of paths needed while maintaining routing control capability.
Solution Approach 2:
The patent introduces remote path selection logic as an intermediary mechanism between core routers and edge routers. This intermediary allows core routers to control the selection of traffic engineered paths without requiring direct deployment at edge routers, thus reducing the number of paths needed while maintaining control.
2Device complexity
If traffic engineered paths are deployed between core routers, then scalability issues are avoided with smaller number of paths, but control over routing certain traffic to particular paths is lost
Solution Approach 1:
The patent implements preliminary path selection at core routers by establishing remote path selection logic before traffic reaches edge routers. This preliminary action allows control decisions to be made upstream at core routers, maintaining routing control while using fewer paths deployed between core routers rather than edge routers.
Data Source
AI summary
Selecting remote path using forwarding path preferences is disclosed. In an embodiment, a message of a first network node identifying one or more forwarding path preferences in association with one or more destination addresses is received at a packet router. A particular path corresponding to a particular forwarding path preference from among the one or more forwarding path preferences received in the message is determined and in response a particular label is determined. A forwarding entry associating the particular label with the particular forwarding path preference and the particular path is stored. The particular label is forwarded to a second network node. A packet including the particular label is received at the packet router and the particular path associated with the particular label included with the packet is selected based on the forwarding entry associated with the label. The packet is forwarded to a network node via the selected path.