Virtual Router Tunnel Redundancy for IP Networks
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Solution Overview
Problem
IP tunneling configurations in data transmission technologies require excessive TCAM resources and lack redundancy, leading to time-consuming failover processes and packet losses due to the need for multiple dedicated tunnels between routers, with no automatic failover mechanism in case of router failures.
Innovation Solution
Implementing virtual router protocols like VRRP and Multi Chassis LAG to create a single dedicated IP tunnel with failover capabilities, reducing TCAM usage and enabling automatic router redundancy by designating backup routers to take over in case of failures, thus minimizing manual intervention and packet loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dedicated IP tunnels are configured between individual routers at branch offices and HQ, then data transmission connectivity is established, but TCAM resource usage increases excessively
Solution Approach 1:
Multiple individual IP tunnels between branch office routers and HQ routers are merged into a single virtual router tunnel. The virtual router consolidates multiple physical router interfaces, allowing all branch office routers to communicate with HQ through one aggregated tunnel endpoint, thereby reducing TCAM resource consumption while maintaining connectivity.
Solution Approach 2:
The virtual router is designed to serve multiple functions simultaneously: it acts as a single tunnel endpoint for multiple branch office routers, provides failover capabilities, and manages multiple physical router interfaces. This multi-functionality eliminates the need for separate dedicated tunnels for each router pair.
2Ease of operation
If individual dedicated IP tunnels are configured between each router pair, then direct connectivity is achieved, but redundancy and failover capabilities are lost
Solution Approach 1:
Backup routers are pre-configured as standby endpoints for the virtual router tunnel before any failure occurs. When a primary router fails, the backup router is already positioned and configured to immediately take over tunnel operations, enabling automatic failover without manual intervention or reconfiguration.
Solution Approach 2:
The virtual router acts as an intermediary layer between physical routers and the IP tunnel infrastructure. It abstracts the complexity of multiple physical connections into a single logical tunnel endpoint, while simultaneously providing failover mechanisms that individual router-to-router tunnels cannot offer.
3Reliability
If multiple IP tunnels are configured between routers, then connectivity is established, but configuration complexity and manual intervention requirements increase
Solution Approach 1:
The virtual router provides a universal configuration interface that manages multiple physical router connections through a single tunnel configuration. Instead of configuring separate tunnels for each router pair, administrators configure one virtual router tunnel that automatically handles all connections, significantly reducing configuration complexity.
Data Source
AI summary
A system, method, and computer program for providing tunneling redundancy is provided. The method may include using router redundancy protocols on routers at endpoints of virtual IP tunnels to allow for failover of a master router to a backup router that assumes control over a virtual IP address in order to keep packet transmission in the virtual IP tunnel flowing with minimal interruption and no remote reconfiguration.