xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch CLI Manual
config stp
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
.
lbd [enable | disable] –
Enabling this feature temporarily blocks
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.
lbd_recover_timer [0 | <value 60-1000000>] -
This field will set the
time the STP port will wait before recovering the STP state set. 0
will denote that the LBD will never time out or restart until the
administrator personally changes it. The user may also set a time
between 60 and 1000000 seconds. The default is 60 seconds.
Restrictions Only
administrator-level users can issue this command.
Example usage:
To configure STP with maxage 18 and maxhops of 15:
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