D-Link DGS-3426 User Manual - Page 168
Max Hops 1-20, TX Hold Count 1-10, Forwarding BPDU, Loopback Detection, LBD Recover Time, Enabled
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xStack DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch Max Hops (1-20) TX Hold Count (1-10) Forwarding BPDU Loopback Detection LBD Recover Time Used to set the number of hops between devices in a spanning tree region before the BPDU (bridge protocol data unit) packet sent by the Switch will be discarded. Each switch on the hop count will reduce the hop count by one until the value reaches zero. The Switch will then discard the BPDU packet and the information held for the port will age out. The user may set a hop count from 1 to 20. The default is 20. Used to set the maximum number of Hello packets transmitted per interval. The count can be specified from 1 to 10. The default is 3. This field can be Enabled or Disabled. When Enabled, it allows the forwarding of STP BPDU packets from other network devices. The default is Enabled. When enabled, the Switch will temporarily block STP switch-wide when a BPDU packet has looped back. If the Switch detects its own BPDU packet coming back, it signifies a loop on the network - STP is automatically blocked and an alert is sent to the administrator. The default is Enabled. Time allowed (in seconds) for recovery when an STP Loopback is detected. After the timer has expired the Switch checks for an STP loopback, if no loopback detected, STP is resumed. Entering 0 will disable LBD recovery. Click Apply to implement changes made. 154