D-Link 3312SR Reference Manual - Page 78
config stp, con stp ports, DGS-3312SR:4#config stp maxage 18 maxhops 15, Success., DGS-3312SR:4
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DGS-3312SR Layer 3 Gigabit Switch config stp Restrictions in the network, preventing the effective propagation of the new information. Set by the Root Bridge, this value will aid in determining that the Switch has spanning tree configuration values consistent with other devices on the bridged LAN. If the value ages out and a BPDU has still not been received from the Root Bridge, the Switch will start sending its own BPDU to all other switches for permission to become the Root Bridge. If it turns out that your switch has the lowest Bridge Identifier, it will become the Root Bridge. The user may choose a time between 6 and 40 seconds. The default value is 20. maxhops - 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 BDPU 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. hellotime − The user may set the time interval between transmission of configuration messages by the root device in STP, or by the designated router in RSTP, thus stating that the Switch is still functioning. A time between 1 and 10 seconds may be chosen, with a default setting of 2 seconds. In MSTP, the spanning tree is configured by port and therefore, the hellotime must be set using the configure stp ports command for switches utilizing the Multiple Spanning Tree Protocol. forwarddelay − The maximum amount of time (in seconds) that the root device will wait before changing states. The user may choose a time between 4 and 30 seconds. The default is 15 seconds. txholdcount - The maximum number of BDPU Hello packets transmitted per interval. Default value = 3. fbpdu [enable | disable] − Allows the forwarding of STP BPDU packets from other network devices when STP is disabled on the Switch. The default is enable. Only administrator-level users can issue this command. Example usage: To configure STP with maxage 18 and maxhops of 15: DGS-3312SR:4#config stp maxage 18 maxhops 15 Command: config stp maxage 18 maxhops 15 Success. DGS-3312SR:4# 72
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