An Access Protection Solution for Heavy Load Unfairness in DQDB

Authors

Lakshmana N. Kumar, Washington University in St Louis
Andreas D. Bovopoulos, Washington University in St Louis

Document Type

Technical Report

Publication Date

1991-07-01

Filename

WUCS-91-39.pdf

Technical Report Number

WUCS-91-39

Abstract

This paper discusses the unfairness issue arising in a 802.6 DQDB network at high loads-- when the traffic demand to a bus exceeds the capacity of that bus. As per the 802.6 protocol, at heavy loads, the end nodes along a bus experience longer delays than the other nodes. The origin and remedy of this heavy load unfairness is discussed. An access control scheme is proposed as a solution. The comparison of the proposed scheme with 802.6 protocol is presented. The simulation results and performance characteristics are discussed under several types of loads. With symmetric load conditions under the proposed scheme, all active nodes along a bus experience almost the same access delay and packet loss characteristics. Performance under several other load condition are also found to be satisfactory.

Comments

Permanent URL: http://dx.doi.org/10.7936/K7K35S1D

Recommended Citation

Kumar, Lakshmana N. and Bovopoulos, Andreas D., "An Access Protection Solution for Heavy Load Unfairness in DQDB" Report Number: WUCS-91-39 (1991). All Computer Science and Engineering Research.
https://openscholarship.wustl.edu/cse_research/657