D-Link DES-3550 Product Manual - Page 94

xStack® DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual Use the Traffic Control Setting window to enable or disable storm control and adjust the threshold for multicast and broadcast storms, as well as Unicast (Destination Look Up Failure). Traffic control settings are applied to individual Switch modules. To view the following window, click Configuration > Traffic Control: The user may set the following parameters: Parameter Description Trap Setting Traffic Control Trap Enable sending of Storm Trap messages when the type of action taken by the Traffic Control function in handling a Traffic Storm is one of the following: None - Will send no Storm trap warning messages regardless of action taken by the Traffic Control mechanism. Storm Occurred - Will send Storm Trap warning messages upon the occurrence of a Traffic Storm only. Storm Cleared - Will send Storm Trap messages when a Traffic Storm has been cleared by the Switch only. Both - Will send Storm Trap messages when a Traffic Storm has been both detected and cleared by the Switch. This function cannot be implemented in the Hardware mode. (When Drop is chosen in the Action field. Traffic Control Settings Storm Type Select the type of Storm Type to detect, either Broadcast Multicast or Unicast. Once selected , use the pull-down menu to enable or disable this storm detection. Action Select the method of traffic Control from the pull down menu. The choices are: shutdown - Utilizes the Switch's software Traffic Control mechanism to determine the Packet Storm occurring. Once detected, the port will deny all incoming traffic to the port except STP BPDU packets, which are essential in keeping the Spanning Tree operational on the Switch. If the countdown timer has expired and yet the Packet Storm continues, the port will be placed in Shutdown Forever mode and is no longer operational until the user manually resets the port using the config ports enable command or waits for 5 mins to let the Shutdown Forever mode enter AutoRecovery. Choosing this option obligates the user to configure the Interval setting as well, which will provide packet count samplings from the Switch's chip to determine if a Packet Storm is occurring. drop - Utilizes the hardware Traffic Control mechanism, which means the Switch's hardware will determine the Packet Storm based on the Threshold value stated and drop packets until the issue is resolved. Group List Select the ports to be manually recovered from the Shutdown state. Threshold Specifies the maximum number of packets per second that will trigger the Traffic Control function to commence. The configurable threshold range is from 0-255000 with a default setting of 128000. Time Interval The Interval will set the time between Multicast and Broadcast packet counts sent from the Switch's chip to the Traffic Control function. These packet counts are the determining factor in deciding when incoming packets exceed the Threshold value. The Interval may be set between 5 and 30 seconds with the default setting of 5 seconds. Count Down The Count Down timer is set to determine the amount of time, in minutes, that the Switch will wait before shutting down the port that is experiencing a traffic storm. This parameter is only useful for ports configured as Shutdown in their Action field and therefore will not operate for Hardware based Traffic Control implementations. The possible time settings for this field are 0, 5-30 minutes. 0 is the default setting for this field and 0 will denote that the port will immediately shutdown. Click Apply to implement the settings made. NOTE: Traffic Control cannot be implemented on ports that are set for Link Aggregation (Port Trunking). 79