Huawei S1700 Series Web User Manual page 69

S1700 Managed Series Ethernet Switches
Web User Manual
Item
Working Mode
Bridge-diameter
Max Hops
Pathcost Standard
BPDU Protection
Set Bridge Diameter and Timer
Forward-delay
Hello Time
Issue 05 (2012-10-25)
Description
Specify types of spanning tree adopted on this switch.
STP: select this parameter to set global spanning tree
protocol on switch (STP).
RSTP: select this parameter to set global rapid spanning
tree protocol on switch (RSTP).
MSTP: select this parameter to set global multiple
spanning tree protocol on switch (MSTP).
Bridge-diameter: 2-7, in step of 1, calculate the default
Forward Delay, Hello Timer, Max-Age based on the
different Network-diameter.
Set the device hops among the devices within spanning
tree regions before the BPDU packets are discarded by the
switch. The number of hop will be reduced one when each
packet passes through the switch until the hop count to
zero. At this point, the switch will discard the BPDU
packet, and interface information in packet will be
time-out. Value ranges from 6 to 40, default is 20.
Choose the standard of path cost calculation. The options
are as follow: dot1t, dot1d-1998 and legacy.
Under normal circumstances, the edge interface will not
receive a BPDU. If someone attacks device maliciously
with fake BPDU, the switch will automatically set the
edge interface to non-edge interface and re-calculate
spanning tree to avoid network jitter when the edge
interface receives BPDU. When BPDU protection
function is enabled on switch, the edge interface will be
shutdown when receiving the BPDU, but the properties of
the edge interface will be the same. At the same time, the
network management system will be notified. The
shutdown edge port can only be restored by network
manager manually (the default is Disable).
The setting range is 4-30 seconds (default: 15sec). Each
interface on the switch needs to wait double of
forward-delay time when the blocked status changes to
forwarding status.
Interval for root bridge's broadcast "hello" message.
"hello" message is used to detect whether the network
topology is normal or not.
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