DES-1228/ME Layer 2 Metro Ethernet Switch CLI Reference Manual
78
config stp version
Switch.
Restrictions
Only Administrator-level users can issue this command.
Example usage:
To set the Switch globally for the Multiple Spanning Tree Protocol (MSTP):
DES-1228/ME:4#config stp version mstp
Command: config stp version mstp
Success.
DES-1228/ME:4#
config stp
Purpose
Used to setup 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] | |lbd
[enable|disable] |lbd_recover_timer [<value 0> | <value 60-1000000>]}(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 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 <1-10>
−
The maximum number of BPDU 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
enable
.
lbd [enable | disable] –
Enabling this feature temporarily block STP on the Switch when a
BPDU packet has been looped back to the switch. When the Switch detects its own BPDU
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 LBD STP port will restart (change to
discarding state) when the
LBD Recover Time
times out. The default is enabled.
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.
