Configuring The Max Transmission Speed On A Port - 3Com Switch 7700 Configuration Manual

278 C 8: STP O
HAPTER PERATION
Configuring the Max
Transmission Speed on
a Port
A max age that is too short, can cause the network device to calculate the
spanning tree frequently and mistake the congestion as a link fault. If the max age
is too long, the network device may not be able to discover the link fault and
recalculate the spanning tree in time, which weakens the auto-adaptation capacity
of the network. The default value is recommended.
To avoid frequent network flapping, the values of hello time, forward delay and
maximum age should guarantee the following formulas equal.
2 * (forward-delay - 1seconds) >= maximum-age
maximum-age >= 2 * (hello + 1.0 seconds)
You should use the stp root primary command to specify the network diameter
and hello time of the switching network so MSTP will calculate automatically and
give better values.
By default, forward delay is 15 seconds, hello time is 2 seconds, and max age is 20
seconds.
The max transmission speed on a port specifies how many MSTP packets will be
transmitted, every hello time, through the port.
The max transmission speed on a port is limited by the physical state of the port
and the network structure. You can configure it according to the network
conditions.
You can configure the max transmission speed on a port in the following ways.
Configuring in system view
Perform the following configuration in system view.
Table 10 Configure the Max Transmission Speed on a Port
Operation
Configure the max transmission speed on a
port.
Restore the max transmission speed on a port. undo stp interface interface-list
Configuring in Ethernet port view
Perform the following configuration in Ethernet port view.
Table 11 Configure the Max Transmission Speed on a Port
Operation
Configure the max transmission speed on a
port.
Restore the max transmission speed on a port. undo stp transit-limit
For more about the commands, see the Switch 7700 Command Reference Guide.
This parameter only takes a relative value without units. If it is set too large, too
many packets will be transmitted during every hello time and too many network
resources will be occupied. The default value is recommended.
Command
stp interface interface-list transit-limit
packetnum
transit-limit
Command
stp transit-limit packetnum