D-Link DES-3624 Product Manual - Page 53

Stackable NWay Ethernet Switch User's Guide priority tag field in the packet header contains a value of 0-3, the packet will be placed in the low priority queue; a value of 4-7 causes the packet to be placed in the high priority queue. ♦ Port Lock When Enabled, automatic learning for all stations connected to this port will stop and entries in the Forwarding Table for all devices residing on this port will age out. The only traffic this port will allow is traffic from machines whose MAC address is manually entered in the Static Forwarding Table. ♦ Broadcast Storm Rising Action This setting will be activated when a Broadcast Storm Rising Threshold is met. When triggered, the port can be configured to Do Nothing, Block, or Block & Trap. The Do Nothing setting causes the switch to operate normally, in other words, ignore the broadcast storm condition. The Block setting causes the port to drop all broadcast frames, thus isolating the broadcast storm. Block & Trap performs the same action as Block, except it also sends a trap to the designated Trap Recipient informing them of the situation. For more information on broadcast storms, please refer to the previous chapter. ♦ Broadcast Storm Rising Action Threshold This setting defines a ceiling for the number of broadcast packets per second on this port. Once met, the Broadcast Storm Rising Action (above) will be triggered. The assigned number should be high enough to allow normal broadcast packets (which comprise significant traffic) to be let through, while being low enough so that broadcast storms can be detected early. The Rising Threshold can be from 1 to 1488000, with 500 the default. ♦ Broadcast Storm Falling Action This setting will be activated when the Broadcast Storm Rising Threshold and then the Broadcast Storm Falling Threshold are each met. This setting can be configured to Do Nothing, Forward, or Forward & Trap. The Do Nothing setting causes the switch to operate normally, that is, to ignore the situation. If the port had met the Broadcast Storm Rising Action criteria and started Blocking broadcast packets, it will continue doing so. The Forwarding setting causes the port to begin forwarding broadcast frames, thus removing the Blocking state imposed by the Broadcast Storm Rising Action. Forward & Trap performs the same action as Forward, except it also sends a trap to the designated Trap Recipient informing them of the situation. ♦ Broadcast Storm Falling Action Threshold This setting defines the number of broadcast packets per second on this port which will trigger the Broadcast Storm Falling Action (above). This threshold will only trigger an action if the Broadcast Storm Rising Threshold has first been reached. The assigned number should be high enough to allow normal broadcast packets (which comprise significant traffic) to be let through as early as possible, while being low enough so that broadcast storms are completely eliminated. The Falling Threshold can be from 1 to 1488000, with 250 the default. Press CTRL+S to let the changes take effect. If you wish these changes to be the default for the switch, return to the main menu and choose Save Changes. STP Port State (whether the Spanning Tree Protocol is enabled or disabled on this port) and Link Status reflect the current conditions of the port. They are read-only fields and cannot be changed. Configure Trunk Groups Ports on the Switch can be grouped together in a single logical port called a trunk. This is discussed in detail in the Port Trunking section of the "Switch Management Concepts" chapter of this manual. To set up a trunk group, choose Configure Trunk Groups on the System Configuration menu. The following screen appears: Using the Console Interface 57