TimeFlip: Using Timestamp-Based TCAM Ranges to Accurately Schedule Network Updates
| Autor: | Tal Mizrahi, Yoram Moses, Ori Rottenstreich |
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| Rok vydání: | 2017 |
| Předmět: |
Schedule
Computer Networks and Communications Computer science Distributed computing Real-time computing 020206 networking & telecommunications 02 engineering and technology Content-addressable memory Networking hardware Clock synchronization Synchronization 020202 computer hardware & architecture Computer Science Applications 0202 electrical engineering electronic engineering information engineering Transient (computer programming) Timestamp Electrical and Electronic Engineering Software |
| Zdroj: | IEEE/ACM Transactions on Networking. 25:849-863 |
| ISSN: | 1558-2566 1063-6692 |
| DOI: | 10.1109/tnet.2016.2608441 |
| Popis: | Network configuration and policy updates occur frequently, and must be performed in a way that minimizes transient effects caused by intermediate states of the network. It has been shown that accurate time can be used for coordinating network-wide updates, thereby reducing temporary inconsistencies. However, this approach presents a great challenge; even if network devices have perfectly synchronized clocks, how can we guarantee that updates are performed at the exact time for which they were scheduled? In this paper, we present a practical method for implementing accurate time-based updates, using TimeFlips. A TimeFlip is a time-based update that is implemented using a timestamp field in a ternary content addressable memory (TCAM) entry. TimeFlips can be used to implement atomic bundle updates, and to coordinate network updates with high accuracy. We analyze the amount of TCAM resources required to encode a TimeFlip, and show that if there is enough flexibility in determining the scheduled time, a TimeFlip can be encoded by a single TCAM entry, using a single bit to represent the timestamp, while allowing a very high degree of accuracy. |
| Databáze: | OpenAIRE |
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