RT-5G Route Publishing for Low-End EVPN RT-5 Forwarding
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Solution Overview
Problem
Low-end RT-5 nodes in a Data Center (DC) cannot efficiently forward data messages due to their limited processing capabilities when receiving RT-5G routes, leading to inefficient message forwarding.
Innovation Solution
The method involves publishing RT-5G routing messages with modified GW-IP and ESI fields to enable low-end RT-5 nodes to analyze and forward data messages by converting complex RT-5G routes into simpler RT-5E or RT-2 routes, allowing them to reach the correct next hops without requiring additional iterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC Gateway publishes an RT-5G route with the loopback address as GW-IP field, then the routing information can be propagated to RT-5 nodes, but low-end RT-5 nodes cannot efficiently forward data messages due to limited processing capabilities and multiple iteration requirements
Solution Approach 1:
The patent changes the parameter representation in routing messages by introducing the ESI field to replace the complex GW-IP loopback address mechanism. This parameter substitution transforms the routing information format, allowing low-end RT-5 nodes to process routes more efficiently through single-iteration analysis without requiring multiple lookup cycles in the IP-VRF route table.
2Reliability
If the RT-5G route uses the loopback address IP1 as GW-IP field, then the route can be established, but the TOR1 node requires high processing performance to handle multiple iterations in IP-VRF
Solution Approach 1:
The patent extracts the complex loopback address iteration logic from the RT-5 node processing path and relocates it to the route publication stage. By embedding the ESI field directly in the RT-5G routing message, the patent removes the burden of multiple IP-VRF iterations from low-end RT-5 nodes, effectively extracting the computational complexity from the forwarding path.
3Measurement precision
If multiple iterations are performed in IP-VRF according to GW-IP, then the correct next hop can be determined, but the forwarding efficiency is reduced due to repeated lookups
Solution Approach 1:
The patent performs preliminary action by pre-computing and embedding the ESI field in the RT-5G routing message before propagation. This preliminary inclusion of forwarding information eliminates the need for repeated iterations at each node, as the ESI field already contains the necessary next-hop identification data, thereby reducing forwarding delay while maintaining next-hop determination accuracy.
Data Source
AI summary
Provided are a method and an apparatus for publishing an RT-5G routing message, a storage medium and an electronic apparatus. The method includes: publishing, by a first device, an RT-5G routing message for a CE-Prefix to enable a low-end RT-5 node to receive the RT-5G routing message, where a GW-IP field of the RT-5G routing message carries a first IP; a next hop of Overlay of the CE-Prefix is a second IP, and the second IP is allowed to be reached by means of a node to which the first IP belongs; the RT-5G routing message is configured to instruct the low-end RT-5 node to analyze the GW-IP field carried in the RT-5G routing message into an RT-2 route; and the second IP is not in a directly-connected subnet of an EVPN.