3Com 3800 - Creating STP Domains

Creating STP Domains 7-9
Figure 7-6 shows a similar configuration in which the VLANs are all
port-based. The trunk connections between the Switches require one
trunk port per Switch for each VLAN.
Figure 7-6 Port-based STP configuration
To remove all the bridging loops, STP may block traffic on the VLAN
Sales trunk between Switch 1 and Switch 2, on the VLAN Sales trunk
between Switch 2 and Switch 3, and on the VLAN Marketing trunk
between Switch 1 and Switch 3.
Of the three VLANs, only VLAN Engineering is correctly configured, so
that all ports in that VLAN can communicate with each other.
Creating STP
Domains
To create one or more STP domains on your Switch, use the following
command at the administrator prompt:
create stpd <stpd_name>
STPD and VLAN profile names must all be unique. For example, a name
given to identify a VLAN cannot be used when you create an STPD.
To add one or more VLANs to the STPD, use the following command:
config stpd <stpd_name> add vlan <name>
Marketing & Sales Marketing, Sales & Engineering
Sales & Engineering
Switch 1 Switch 3
Switch 2
Sales
Sales
Engineering
Sales
Marketing
SW3800.BK Page 9 Tuesday, May 5, 1998 5:20 PM