3Com Switch 4800G 24-Port Configuration Manual page 220

220 C 23: MSTP C
HAPTER
n
Configuring the
Maximum Transmission
Rate of Ports
n
ONFIGURATION
the upstream device within nine times the hello time, it will assume that the
upstream device has failed and start a new spanning tree calculation process.
In a very stable network, this kind of spanning tree calculation may occur because
the upstream device is busy. In this case, you can avoid such unwanted spanning
tree calculation by lengthening the timeout time.
Configuration procedure
Follow these steps to configure the timeout factor:
To do...
Enter system view
Configure the timeout factor
of the device
Timeout time = timeout factor × 3 × hello time.
■
Typically, we recommend that you set the timeout factor to 5, or 6, or 7 for a
■
stable network.
Configuration example
# Set the timeout factor to 6.
<Sysname> system-view
[Sysname] stp timer-factor 6
The maximum transmission rate of a port refers to the maximum number of MSTP
packets that the port can send within each hello time. The maximum transmission
rate of an Ethernet port is related to the physical status of the port and the
network structure.
Configuration procedure
Follow these steps to configure the maximum transmission rate of a port or a
group of ports:
To do...
Enter system view
Enter Ethernet Enter Ethernet
interface view interface view
or port group
Enter port
view
group view
Configure the maximum
transmission rate of the port(s)
If the maximum transmission rate setting of a port is too big, the port will send a
large number of MSTP packets within each hello time, thus using excessive
network resources. We recommend that you use the default setting.
Use the command...
system-view
stp timer-factor number
Use the command...
system-view
interface interface-type
interface-number
port-group { manual
port-group-name |
aggregation agg-id }
stp transmit-limit
packet-number
Remarks
-
Optional
3 by default
Remarks
-
Required
Use either command.
Configurations made in
Ethernet interface view will
take effect on the current port
only; configurations made in
port group view will take
effect on all ports in the port
group.
Optional
10 by default