Media Gateway Link Redundancy via Internal VLAN Bridging
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Solution Overview
Problem
Existing methods for implementing link redundancy in media gateways, such as using external Ethernet switches or Cisco's Bridged Virtual Interface (BVI) or Switched Virtual Interface (SVI), introduce additional costs, increase potential failure points, and require card switchover or single-point hardware configurations, which are inefficient and unreliable.
Innovation Solution
A method that provisions a media gateway link protection group with a common VLAN to associate primary and secondary links on line cards, using a cross connection for automatic bridging between them, allowing traffic to switch seamlessly without card switchover and supporting multiple VLANs transparently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external Ethernet switches are used to provide link redundancy, then link redundancy is achieved, but equipment costs increase and the number of potential failure points increases
Solution Approach 1:
The patent merges the link redundancy function into the media gateway itself by implementing a protection group that combines active and standby links within the same hardware device. This eliminates the need for external Ethernet switches to provide redundancy, as the media gateway internally bridges the active and standby links through cross-connections between line cards, thereby reducing equipment costs and potential failure points while maintaining reliability
Solution Approach 2:
The media gateway is designed to perform multiple functions: it serves as both the primary communication device and the redundancy mechanism. The protection group feature allows the same media gateway to provide link redundancy without requiring separate dedicated redundancy hardware, making the system more versatile and cost-effective
2Reliability
If card switchover is implemented for link redundancy, then link redundancy is achieved, but the complexity of card operations increases and potential failure points increase
Solution Approach 1:
The standby line card is pre-configured with all necessary connection information, voice server associations, and routing parameters before the failover event. This preliminary setup eliminates the need for complex real-time card switchover operations, as the standby card is already ready to assume active responsibilities immediately upon link failure without requiring operational transitions or reconfiguration
Solution Approach 2:
The standby line card maintains a complete copy of the active line card's connection state, including voice server mappings, QoS parameters, and routing information. This copying approach allows the standby card to take over seamlessly without requiring complex switchover logic, as it simply activates the pre-copied configuration rather than transferring operational state
3Reliability
If BVI/SVI approach is used for link redundancy, then link redundancy is achieved, but configuration complexity increases and single point of failure is introduced
Solution Approach 1:
The patent segments the redundancy function at the line card level rather than requiring router-level BVI/SVI configuration. Each line card independently manages its own protection group with the standby card, allowing distributed configuration that is simpler and more maintainable. This segmentation eliminates the need for complex per-VLAN bridge configurations and reduces the single point of failure by distributing redundancy logic across multiple hardware components
Data Source
AI summary
Methods, systems, and computer program products for implementing link redundancy in a media gateway are provided according to one method, a media gateway link protection group is provisioned to associate with a common VLAN a common virtual local area network (VLAN) primary and secondary links associated with at least one line card in a media gateway. The primary and secondary links are connected using a cross connection between ports associated with the at least one line card. At run time, traffic is automatically bridged between the primary and secondary links using the common VLAN and the cross connection.