3Com 400 Family, Configuration Manual

Page: 173 / 344

RSTP Configuration 171
Only after the RSTP is enabled on the Switch can other configurations take effect.
By default, RSTP is enabled.
Enable/Disable RSTP on
a Port
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.
Table 171 Enable/Disable RSTP on a Port
Note that the redundancy route may be generated after RSTP is disabled on the
Ethernet port.
By default, RSTP on all the ports will be enabled after it is enabled on the Switch.
Configure RSTP
Operating Mode
RSTP is executable in RSTP mode or STP-compatible mode. RSTP mode is applied
when all the network devices provided for executing RSTP, while the
STP-compatible mode is applied when both STP and RSTP are executable on the
network.
You can use the following command to set the RSTP operating mode.
Perform the following configurations in System View.
Table 172 Set RSTP Operating Mode
Normally, if there is a bridge provided to execute STP in the Switching network,
the port (in the Switch running RSTP), which connects to another port (in the
Switch for executing STP), can automatically Switch to STP compatible mode from
RSTP mode.
By default, RSTP runs in RSTP mode.
Configure the
STP-Ignore attribute of
VLANs on a Switch
RSTP is a single spanning tree protocol, under which only one spanning tree will
be generated on one Switched network. To ensure the successful communication
between VLANs on a network, all of them must be distributed consecutively along
the STP path; otherwise, some VLANs will be isolated due to the blocking of
intra-links, causing the failure in cross-VLAN communication. Once there are
VLANs specially required to be located away from the STP path, you can solve the
Restore RSTP to the default value
undo stp
Operation Command
Operation Command
Enable RSTP on a specified port
stp enable
Disable RSTP on a specified port
stp disable
Operation Command
Configure to run RSTP in STP-compatible/RSTP mode
stp mode { stp | rstp }
Restore the default RSTP mode
undo stp mode