Hybrid Bridging Node Address Resolution for VPLS Cutover
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Solution Overview
Problem
Provider bridging networks face challenges with large MAC address tables due to shared MAC address spaces, leading to increased costs and complexity when upgrading to VPLS or PBB protocols, as existing protocols require wholesale network upgrades.
Innovation Solution
A hybrid bridging node operates both legacy and upgraded bridging protocols, selectively broadcasting address resolution and unicast packets to limit MAC address table growth in legacy nodes, allowing incremental transition to VPLS or PBB without full network upgrades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the entire network is upgraded to VPLS or PBB protocols, then MAC address table size is reduced and network efficiency is improved, but capital expenditure and operating expenditure increase significantly
Solution Approach 1:
The network is segmented into legacy bridging domains and VPLS/PBB domains, with hybrid bridging nodes acting as boundary elements. This allows the network to be upgraded incrementally rather than wholesale, reducing capital expenditure while still achieving MAC address table size reduction in the upgraded segments.
Solution Approach 2:
The hybrid bridging node dynamically switches between legacy bridging protocol and VPLS/PBB protocol based on the destination. It selectively broadcasts address resolution packets only when necessary, adapting its behavior to minimize MAC address table growth in legacy nodes while enabling efficient forwarding in upgraded nodes.
2Adaptability or versatility
If legacy bridging protocol is used, then network compatibility is maintained, but MAC address table size grows exponentially with network scale
Solution Approach 1:
The hybrid bridging node acts as an intermediary between legacy bridging nodes and VPLS/PBB nodes. It receives address resolution packets from legacy nodes, selectively forwards them to VPLS/PBB nodes, and prevents unnecessary propagation to other legacy nodes, thereby limiting MAC address table growth while maintaining compatibility.
Solution Approach 2:
Different parts of the network use different protocols appropriate to their needs. Legacy segments maintain compatibility through the legacy bridging protocol, while upgraded segments benefit from VPLS/PBB's efficient MAC address handling. The hybrid node enables this local optimization without requiring uniform protocol adoption across the entire network.
3Quantity of substance
If VPLS or PBB protocol is used, then MAC address table size is reduced, but the entire network must be upgraded simultaneously
Solution Approach 1:
The network upgrade is segmented into manageable portions, with individual hybrid bridging nodes being upgraded independently. This allows the network to transition to VPLS/PBB incrementally, reducing MAC address table size in upgraded segments without requiring simultaneous upgrading of the entire network, thereby reducing device complexity and planning burden.
Data Source
AI summary
A method and apparatus that operates two bridging protocols in a hybrid bridging node is described. The operation of the two bridging protocols in the hybrid node allows for an incremental transition of a provider bridging network from operating a legacy bridging protocol that shares MAC addresses to a bridging network that operates VPLS and/or PBB bridging protocols. The hybrid bridging node selectively broadcasts address resolution packets and unicast packets with unknown MAC addresses from the nodes operating VPLS and/or PBB to nodes operating a legacy bridging protocol.