config stp version
Purpose Used to globally set the version of STP on the Switch.
Syntax config stp version [mstp | rstp | stp]
Description This command allows the user to choose the version of the spanning tree to be implemented on the Switch.
Parameters mstp – Selecting this parameter will set the Multiple Spanning Tree Protocol (MSTP) globally on the Switch.
rstp - Selecting this parameter will set the Rapid Spanning Tree Protocol (RSTP) globally on the Switch.
stp - Selecting this parameter will set the Spanning Tree Protocol (STP) globally on the Switch.
Restrictions Only administrator-level users can issue this command.
Example usage:
To set the Switch globally for the Multiple Spanning Tree Protocol(MSTP):
AT-9724TS:4# config stp version mstp
Command: config stp version mstp
S u c c e s s .
A T - 9 7 2 4 T S : 4 #
config stp
Purpose Used to setup STP, RSTP and MSTP on the Switch.
Syntax config stp {maxage <value 6-40> | maxhops <value 1-20> | hellotime <1-10> |
forwarddelay <value 4-30> | txholdcount <value 1-10> | fbpdu [enable | disable]}
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 1-20> - 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 <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.
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
= 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.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure STP with maxage 18 and maxhops of 15:
AT-9724TS:4# config stp maxage 18 maxhops 15
Command: config stp maxage 18 maxhops 15
S u c c e s s .
A T - 9 7 2 4 T S : 4 #
70
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch • Command Line Interface Reference Manual
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