Loop Detection feature of OpenMUL

This article explains the spanning tree implementation of MUL SDN Controller.


This feature is used when there are one or more occurrences of loop in the network. Spanning Tree implementation makes sure that there are no loops when there are two or more paths to reach a particular network element. Once a loop is occurred due to a broadcast stream then it can be deadly for the network. So, this makes Loop Detection feature an antidote for any network.



Loop detection module uses LLDP for implementing Spanning Tree.  When network element is added to a network, MUL SDN controller sends LLDP packets to every port of the attached network element. By doing this, MUL Controller gets the information about the network topology.

After getting all the information about the neighbours, port states needs to be decided.

Details of the process are :  Continue reading

MuL 3.2.5 Commercially available now!

It gives us immense pleasure to announce availability of mul-3.2.5 (Carrier Grade).

Release Notes:

All the following features are fully supported.

Meter support
Group support
Port/Flow/Group/Meter/Queue statistics
High Availability
Many security and stability fixes in infrastructure

Features Specification: Continue reading

Mul 3.0.1-beta available now

It gives us immense pleasure to announce availability of mul-3.0.1 (beta). With this MuL has hit couple of firsts : 1) One of the first to support Openflow v1.3.x  and, 2) One of the first to support both OF v1.3.x and backward compatibility with OF v1.0

The release is deemed beta due to lack of multiple switch implementations that we could test against. We welcome any switch vendors willing to interop their hardware (with of1.3.1 support) to get in touch with us for same.

Release Notes (3.0.1-beta) :

– Support for Openflow 1.3.x
* Wire protocol implementation
* Enhanced Multiple Groups support
* Enhanced Multiple Tables support
– Backward compatibility with Openflow 1.0 (supports both openflow versions)
– Many security and stability fixes in infrastructure
– Improved documentation (inside docs folder in source code)


MuL development team