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DCS-3950 series Ethernet switch manual
Switch(Config)#spanning-tree forward-time 20
10.2.2.8 spanning-tree hello-time
Command: spanning-tree hello-time <time>
no spanning-tree hello-time
Function: Set switch Hello time; The command ‘no spanning-tree hello-time’ restores
the default setting.
Parameter: <time> is Hello time in seconds. The valid range is from 1 to 10.
Command mode: Global Mode
Default: Hello Time is 2 seconds by default.
Usage Guide: Hello time is the interval that the switch sends BPDUs. Hello time is
cooperating with forward delay and max age. The parameters should meet the following
conditions. Otherwise, the MSTP may work incorrectly.
2 * (Bridge_Forward_Delay - 1.0 seconds) >= Bridge_Max_Age
Bridge_Max_Age >= 2 * (Bridge_Hello_Time + 1.0 seconds)
Example: Set MSTP hello time to 5 seconds in global mode.
Switch(Config)#spanning-tree hello-time 5
10.2.2.9 spanning-tree link-type p2p
Command: spanning-tree link-type p2p {auto|force-true|force-false}
no spanning-tree link-type
Function: Set the link type of the current port; The command ‘no spanning-tree
link-type’ restores link type to auto-negotiation.
Parameter: auto sets auto-negotiation, force-true forces the link as point-to-point type,
force-false forces the link as non point-to-point type.
Command mode: Interface Mode
Default: The link type is auto by default, The MSTP detects the link type automatically.
Usage Guide: When the port is full-duplex, MSTP sets the port link type as point-to-point;
When the port is half-duplex, MSTP sets the port link type as shared.
Example: Force the port 0/0/7-8 as point-to-point type.
Switch(Config)#interface ethernet 0/0/7-8
Switch(Config-Port-Range)#spanning-tree link-type p2p force-true
10.2.2.10 spanning-tree maxage
Command: spanning-tree maxage <time>
no spanning-tree maxage
Function: Set the max aging time for BPDU; The command ‘no spanning-tree maxage’
restores the default setting.
Parameter: <time> is max aging time in seconds. The valid range is from 6 to 40.
Command mode: Global Mode
Default: The max age is 20 seconds by default.
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