DES-1228/ME Metro Ethernet Managed Switch CLI Reference Guide
109
config stp
Purpose
Used to set up STP, RSTP, and MSTP on the Switch.
Syntax
config stp {maxage <value 6-40> | maxhops <value 6-40> | hellotime <value 1-2> | forwarddelay
<value 4-30> | txholdcount <value 1-10> | fbpdu [enable | disable] } (1)
Description
This command is used to set up 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 6-40>
−
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 6 to 40. The default is 20.
hellotime <value 1-2>
−
The user may set the time interval between transmission of configuration
messages by the root device, thus stating that the Switch is still functioning. A time between 1
and 2 seconds may be chosen, with a default setting of 2 seconds.
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 BPDU Hello packets transmitted per
interval. The default value is 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 enable.
NOTE: 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.
Restrictions
Only Administrator level, Operator level or Power User level users can issue this command.
Example usage:
To configure STP with maxage 18 and maxhops of 15:
DES-1228/ME:5#config stp maxage 18 maxhops 15
Command: config stp maxage 18 maxhops 15
Success.
DES-1228/ME:5#
