3com 5500-SI Manual Do Utilizador

C

HAPTER

 26: RSTP C

ONFIGURATION

Perform the following configurations in Ethernet Port View.

Table 597   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.

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 598   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.

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 
consequent blocking by configuring the STP-Ignore attribute on the appropriate 
Switch. 

Once an STP-Ignored VLAN is configured, the packets of this VLAN will be forwarded 
on any Switch port, with no restriction from the calculated STP path. 

You can configure the STP-Ignore attribute on a Switch by using the following 
commands. 

Perform the following configuration in System View. 

Table 599   Configuring the STP-Ignore Attribute of VLANs on a Switch

By default, no VLAN is STP-Ignored if STP is enabled on the Switch.

Enable RSTP on a specified port

Disable RSTP on a specified port

Configure to run RSTP in STP-compatible/RSTP mode stp mode { stp | rstp }

Restore the default RSTP mode

Specify an STP-Ignored VLAN

 vlan_list

Cancel the configuration of the STP-Ignored 
VLAN 

 vlan_list