BIER Topology Identifiers for Control-Plane Slice Forwarding
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Solution Overview
Problem
Existing multicast technologies face challenges in combining the control plane slice technology with the Bit Indexed Explicit Replication (BIER) technology, particularly in identifying slices on the data plane and ensuring efficient network convergence and service deployment.
Innovation Solution
The solution involves associating a particular topology identifier with the BIER forwarding plane, advertising BIER information to generate corresponding forwarding table entries, and encapsulating this identifier in packet headers for efficient packet forwarding and cancellation, utilizing routing protocols to manage BIER domains and slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control plane slice technology is combined with BIER technology, then differentiated service assurance is improved, but device complexity increases due to the need for topology identifiers and additional forwarding table entries
Solution Approach 1:
The patent merges control plane slice technology with BIER technology by integrating topology identifiers into the BIER packet header and forwarding table structure. This combination enables differentiated service assurance while managing complexity through unified data structures that handle both slice identification and BIER forwarding requirements simultaneously.
Solution Approach 2:
The patent segments the forwarding table into BIER forwarding table entries that are specifically associated with topology identifiers. This segmentation allows the system to manage complexity by organizing forwarding information in a structured manner, where each entry corresponds to a specific topology slice, making the complex differentiated forwarding manageable and scalable.
2Speed
If BIER information is advertised with topology identifiers, then network convergence is improved, but loss of information occurs during packet cancellation in multi-path transmission
Solution Approach 1:
The patent implements feedback mechanisms where nodes advertise BIER information including topology identifiers to the network. This feedback enables nodes to learn about available paths and topology information, facilitating fast network convergence. The feedback also ensures that topology identifiers are consistently propagated, preventing information loss during packet cancellation operations.
Solution Approach 2:
The patent performs preliminary actions by pre-establishing BIER forwarding table entries associated with topology identifiers before actual packet transmission. This preliminary setup includes pre-advertising BIER information with topology identifiers throughout the network, so that when packets need to be forwarded or cancelled, the necessary identification and routing information is already in place, avoiding information loss.
3Reliability
If multiple identical data packets are transmitted through different paths, then reliability is improved, but packet cancellation complexity increases
Solution Approach 1:
The patent uses copying by transmitting multiple identical data packets through different paths simultaneously. Each packet is copied and sent via a separate path, improving reliability through redundancy. The topology identifiers in the packet headers enable nodes to identify and manage these copied packets, facilitating systematic cancellation when needed.
Solution Approach 2:
The patent applies local quality by treating different packet paths differently based on their specific topology identifier associations. Each path has quality characteristics tailored to its topology, and the forwarding decisions consider the local requirements of each path. This allows efficient packet cancellation by targeting specific paths based on their individual topology characteristics rather than treating all paths uniformly.
Data Source
AI summary
Provided are an information advertisement method and apparatus, a packet forwarding method and apparatus, a packet cancellation method and apparatus, a device, and a medium. The information advertisement method includes associating a particular topology identifier with a BIER forwarding plane in a case where a particular topology is constructed; and advertising BIER information to a network, where the BIER information carries the particular topology identifier, and the BIER information is configured to be used by a node in the network to generate a BIER forwarding table entry corresponding to the particular topology.