3Com SuperStack 4 Configuration Manual page 234

246 C 10: RSTP C
HAPTER
Enable/Disable RSTP on
a Switch
Enable/Disable RSTP on
a Port
ONFIGURATION
Device Configuration
Specify the
preference of a
port
Configure
whether to
connect a port
with a
peer-to-peer link
Specify the Path
Cost on a port
Specify the
standard to
follow in Path
Cost calculation
Configure
whether a port
can be an Edge
Port
Specify mCheck
for a port
Configure the
protection
functions on a
Switch
After the STP protocol is enabled, the modification of any parameter will result in
the re-calculation of the spanning tree on the Switch. It is therefore recommended
to configure all the RSTP parameters before enabling the STP feature on the
Switch and the port.
You can use the following command to enable RSTP on the Switch.
Perform the following configurations in System View.
Table 265 Enable/Disable RSTP on a Device
Operation
Enable/Disable RSTP on a device
Restore RSTP to the default value
Only after the RSTP is enabled on the Switch can other configurations take effect.
Some network resource will be occupied after RSTP is enabled.
By default, RSTP is disabled.
You can use the following command to enable/disable the RSTP on the designated
port. To flexibly control the RSTP operations, after RSTP is enabled on the Ethernet
ports of the Switch, it can be disabled again to prevent the ports from
participating in the spanning tree calculation.
Perform the following configurations in Ethernet Port View.
Default Value Note
All Ethernet ports The port preference plays an important
are at the role in root port selection. You can make a
preference 128. port to be root port by giving it a smallest
preference value.
RSTP can detect The two ports connected with a
automatically peer-to-peer link can rapidly transit to the
whether the forwarding status by sending synchronous
current Ethernet packets, eliminating unnecessary
port is connect to a forwarding delay.
peer-to-peer link.
The Switch gets The path cost of a port is closely related to
the path cost of a the transmission rate of the link the port
port from the link connected with. The larger the link rate is,
rate under the IEEE the smaller the path cost shall be. It is
802.1t standard. recommended to use the default
configuration.
All Ethernet ports For ports directly connected with
are configured as terminals, please configure them as edge
non-edge ports. ports, and enable the BPDU protection
function on them.
- You can change the operational mode of
a port from STP-compatible to RSTP.
No protection It is recommended to enable the BPDU
function is enabled protection function on the Switches
on a Switch. directly connected with user PCs.
Command
stp { enable | disable }
undo stp