def refreshAllChassis(connection, sessionUrl):
    '''
        This method is used to refresh all chassis.

        Args:
        - connection is the connection object that manages the HTTP data transfers between the client and the REST API
        - sessionUrl is the address of the session that should run the test
    '''
    chassisListUrl = "%s/ixload/chassisChain/chassisList" % (sessionUrl)
    chassisList = connection.httpGet(chassisListUrl)
    for chassisObj in chassisList:
        chassisId = chassisObj.objectID
        refreshConnectionUrl = "%s/%s/operations/refreshConnection" % (chassisListUrl, chassisId)
        performGenericOperation(connection, refreshConnectionUrl, {})