3com 5500-SI Manual Do Utilizador
RSTP Configuration 551
Table 604 Set Max Age of the Specified Bridge
If the Max Age is too short, it will result in frequent calculation of spanning tree or
misjudge the network congestion as a link fault. On the other hand, too long Max
Age may make the bridge unable to find link failure in time and weaken the network
auto-sensing ability. It is recommended to use the default setting.
misjudge the network congestion as a link fault. On the other hand, too long Max
Age may make the bridge unable to find link failure in time and weaken the network
auto-sensing ability. It is recommended to use the default setting.
By default, the bridge Max Age is 20 seconds.
Set Timeout Factor of
the Bridge
A bridge transmits hello packet regularly to the adjacent bridges to check if there is
link failure. Generally, if the Switch does not receive the RSTP packets from the
upstream Switch for 3 occurrences of hello time, the Switch will decide the upstream
Switch is dead and will recalculate the topology of the network. Then in a steady
network, the recalculation may be caused when the upstream Switch is busy. In this
case, you can redefine the timeout interval to a longer time by defining the multiple
value of hello time.
link failure. Generally, if the Switch does not receive the RSTP packets from the
upstream Switch for 3 occurrences of hello time, the Switch will decide the upstream
Switch is dead and will recalculate the topology of the network. Then in a steady
network, the recalculation may be caused when the upstream Switch is busy. In this
case, you can redefine the timeout interval to a longer time by defining the multiple
value of hello time.
You can use the following command to set the multiple value of hello time of a
specified bridge.
specified bridge.
Perform the following configurations in System View.
Table 605 Set Timeout Factor of the Bridge
It is recommended to set 5, 6 or 7 as the value of multiple in the steady network.
By default, the multiple value of hello time of the bridge is 3.
Specifying the
Maximum Transmission
Rate of STP Packets on a
Port
The maximum transmission rate of STP packets on an Ethernet port is dependent on
the physical status of the port and the network architecture. You can specify it as
needed.
the physical status of the port and the network architecture. You can specify it as
needed.
You can specify the maximum transmission rate on a port by using the following
commands.
commands.
Perform the following configuration in Ethernet Interface View.
Table 606 Specifying the Maximum Transmission Rate of STP Packets on a Por
t
Notably, though a higher transmission rate is introduced at larger Packetnum, more
Switch resources are consequently occupied. It is therefore recommended to use the
default value.
Switch resources are consequently occupied. It is therefore recommended to use the
default value.
Operation
Command
Set Max Age of the specified bridge
stp timer max-age
centiseconds
Restore the default Max Age of the specified bridge
undo stp timer max-age
Operation
Command
Set the multiple value of hello time of a specified bridge
stp timeout-factor
number
Restore the default multiple value of hello time
undo stp timeout-factor
Operation
Command
Specify the maximum transmission rate of STP
packets on a port
packets on a port
stp transmit-limit
packetnum
Restore the default transmission rate of STP
packets on a port
packets on a port
undo stp transmit-limit