xStack
®
DGS-3400 Series Layer 2 Gigabit Managed Switch CLI Manual
84
config stp version
Restrictions Only Administrator and Operator-level users can issue this command.
Example usage:
To set the Switch globally for the Multiple Spanning Tree Protocol (MSTP):
DGS–3426:5#config stp version mstp
Command: config stp version mstp
Success.
DGS–3426:5#
config stp
Purpose Used to setup STP, RSTP, and MSTP on the Switch.
Syntax
config stp {maxage <value 6-40>|maxhops <value 1-40> |hellotime <value 1-10>|
forwarddelay <value 4-30>|txholdcount <value 1-10>|fbpdu [enable|disable]|lbd
[enable|disable] |lbd_recover_timer [<value 0> | <value 60-1000000>]|nni_bpdu_addr
[dot1d | dot1ad]} (1)
Description This command is used to setup the Spanning Tree Protocol (STP) for the entire switch. All
commands here will be implemented for the STP version that is currently set on the Switch.
Parameters
maxage <value 6–40> − This value may be set to ensure that old information does not
endlessly circulate through redundant paths 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 <value 1–40> – 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 40. The default is 20. If the entered value is less than 6, the
maxhops will be 6.
hellotime <value 1–10> − 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. If the value is more than 2, the hellotime will be 2.
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 <value 4–30> − 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 <value 1–10> – The maximum number of BDPU Hello packets transmitted per
interval. Default value = 6.
fbpdu [enable | disable] − Allows the forwarding of STP BPDU packets from other network
devices when STP is disabled on the Switch. The default is disable.
lbd [enable | disable] – When this is enabled, the Switch will temporarily block STP switch–
wide when a BDPU packet has been looped back. If the Switch detects its own BDPU packet
coming back, it signifies a loop on the network. STP will automatically be blocked and an alert
will be sent to the administrator. The default is enable.
lbd_recover_timer [ 0 | < second 60 –1000000 > ] – Time allowed for recovery after an STP
