Huawei quidway s7700 - Configuring STP;RSTP Parameters on an Interface

8.3 Configuring STP/RSTP Parameters on an Interface
A feedback mechanism is provided to confirm topology convergence. Thus, rapid convergence
is implemented for RSTP.
STP does not implement rapid convergence; however, STP parameters, such as the network
diameter, hello time, Max Age time, and Forward Delay time, may affect network convergence.
RSTP is a refinement of STP and implements rapid convergence. In addition to the preceding
parameters, such parameters as the type of the link where the port resides, rapid transition
mechanism, and maximum number of sent BPDUs port parameters also affect STP/RSTP
topology convergence.
For the parameters of devices running STP/RSTP, see Table 8-6.
Table 8-6 Parameters affecting the STP/RSTP topology convergence
Paramete
r
Parameter
Description
Commands Description
System
parameter
network
diameter, timer
value (Hello
Time, Forward
Delay period,
Max Age time),
and timeout
period for
waiting for
BPDUs from
the upstream (3
x hello time x
time factor)
l stp bridge-diameter
diameter
l stp timer hello hello-time
l stp timer forward-delay
forward-delay
l stp timer max-age max-age
l stp timer-factor factor
It is recommended that you
set the network diameter to
determine the timer value.
The switching device
automatically calculates
the Forward Delay period,
Hello time, and Max Age
time based on the network
diameter. Then, you can
run the stp timer-factor
factor command to set the
timeout period for waiting
for BPDUs from the
upstream (3 x hello time x
time factor).
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 8 STP/RSTP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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