Bridged Network Flooding Reduction via Virtual Bridge MAC Segmentation
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Solution Overview
Problem
Bridged networks experience excessive flooding of broadcast and multicast packets, leading to inefficiencies and increased bandwidth usage, as existing solutions lack effective methods to selectively manage packet forwarding across multiple bridges.
Innovation Solution
Configuring bridges to allow only a single bridge to forward broadcast/multicast packets to a device while enabling unicast traffic between the device and multiple bridges, utilizing virtual machines with unique MAC addresses and a virtual bridge for packet switching, and employing commands like SWITCHPORT BLOCK MULTICAST and PORT SECURITY to manage MAC address assignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridges broadcast packets to all ports when destination MAC is not in mapping, then packet delivery reliability is improved, but network bandwidth consumption increases and flooding efficiency deteriorates
Solution Approach 1:
The patent segments the network into multiple bridge domains, where each bridge maintains its own mapping table and forwarding decisions. This segmentation allows localized flooding control within each bridge domain while maintaining overall network reliability through coordinated broadcast domain management.
Solution Approach 2:
The patent introduces a bridge manager as an intermediary component that coordinates between multiple bridges. The bridge manager maintains a global mapping structure and mediates flooding decisions, allowing reliable packet delivery while controlling bandwidth consumption by preventing redundant broadcasts across bridge domains.
2Reliability
If bridges flood packets to all ports, then packet delivery coverage is improved, but network complexity and management difficulty increase
Solution Approach 1:
The patent divides the network into separate bridge domains with independent mapping tables, simplifying management by localizing control decisions. Each bridge manages its own forwarding logic independently, reducing the complexity of coordinating flooding across the entire network while maintaining comprehensive packet delivery coverage.
Solution Approach 2:
The bridge manager serves as a centralized intermediary that simplifies network management by providing a unified view of MAC address mappings across all bridges. This intermediary coordinates flooding decisions and maintains consistency across bridge domains, reducing management complexity while ensuring comprehensive packet delivery.
3Reliability
If multiple bridges forward broadcast packets to a device, then network redundancy is improved, but bandwidth efficiency deteriorates
Solution Approach 1:
The patent segments broadcast domains at the bridge level, where each bridge domain independently manages broadcast traffic. This segmentation maintains network redundancy within each domain while improving overall bandwidth efficiency by preventing redundant broadcasts from propagating across multiple bridges simultaneously.
Solution Approach 2:
The bridge manager acts as a coordinator that manages broadcast domain boundaries and controls which bridges forward broadcast packets. This intermediary maintains necessary network redundancy for reliability while optimizing bandwidth efficiency by preventing redundant broadcasts from reaching multiple bridges.
Data Source
AI summary
Disclosed are, inter alia, methods, apparatus, computer-storage media, mechanisms, and means associated with loss of reducing flooding in a bridged network, typically including a device directly connected to multiple upstream bridges. These bridges are configured such that the device receives broadcast/multicast traffic from a single interface of one of the bridges, while allowing unicast traffic over each of the communications links connecting the device to the bridges. In one configuration, the device implements virtual machine(s), each including a virtual network interface associated with a MAC address; and the directly connected bridges are configured, for each particular MAC address of these MAC addresses of the virtual interfaces, such that one and only one of the bridges will forward packets having the particular MAC address as its destination address over a communications link directly connected to the device.