1. Optical Mesh network for Emerging Gigabit Applications
THE OMEGA TESTBED
Optical Mesh network for Emerging Gigabit Applications
Sanjeev Lakshmanan, Dhruvish Shah, Kishore Gadhiraju, Marco Tacca, Andrea Fumagalli
Optical Networking Advanced Research(OpNeAR) Lab
The University of Texas at Dallas
EXPERIMENT SETUP
RESULTS
MEASUREMENT NETWORK
To analyze performance with a large number of wavelengths(1024), hardware is emulated (OXC’s are disabled)
Network is loaded with different traffic patterns using a random traffic generator
Traffic is first created and provisioned till desired Average Link Load is achieved
Average Link Load = Total number of reserved Wavelengths/Total available wavelengths on each link
Each of the 7 links is failed and repaired 8 times for every measurement
4000 active connections (lightpaths) in the network, using 1024 wavelengths
Each link is failed and repaired 8 times for each measurement
Avg Protection switching times [0.8, 3.48] ms(Min Delay)
Avg Revert switching times [0.77, 3.48] ms(Min Delay)
Both the switching times show a slight linear increase with an increase in the average link load, due to an increase in the number of connections
MESSAGING TO THE MEASUREMENT PC
Protection Switching
LMP detects the failure and floods a Link Failure alarm
The nodes adjacent to the failed link send a PROTECTION-START message to the measurement PC
Each node enters the Protection Procedure and:
Checks the SRLG (failed link) for paths routed over that link
Either switches the ports of the OXC or just updates its database
Sends a PROTECTION-COMPLETE message to the measurement PC
The measurement PC appends its time stamp to the messages and writes it to a file
Revert Switching
DURING A LINK FAILURE
PROTECTION START MESSAGES
LATEST DEVELOPMENTS
LMP detects the recovery and floods a Link Repaired message
The nodes adjacent to the repaired link send a REVERT-START message to the measurement PC
Each node enters the Revert procedure and:
Checks SRLG for paths routed over that link
Either switches the ports of the OXC back to the working path or just updates its database
Sends a REVERT-COMPLETE message to the measurement PC
The measurement PC appends its time stamp to the messages and writes it to a file
Excellent scalability of the control plane software and protocols in the number of wavelengths (232)
Database synchronization has been achieved even with 4000 active connections
No major protocol failure found with increased number of wavelengths (2048), and increased number of connections (4000)
Protection switching times in the order of hundreds of microseconds
Similar results with increased propagation delay
(7.96 ms) on the links
PROTECTION COMPLETE MESSAGES