Rstp Configuration - 3Com Switch 4500 26-Port Configuration Manual

RSTP Configuration

The configuration of RSTP changes with the position of the Switch in the network,
as discussed below.
Figure 53 Configuring STP
Switch A and Switch B: Root
bridge and backup root
bridge
S w itc h A S w itc h A S w itc h A S w itc h A
S w itc h C S w itc h C
S w itc h E S w itc h E
In Figure 53 the Switch 4500 is typically Switch E, F and G. Additionally it could be
Switch C and D. For completeness, configuration of all devices is presented here.
Table 169 RSTP Configuration
Device Configuration
Switch A & Enable the STP
Switch B feature on the
Switch
Enable the STP
feature on the
port
Configure RSTP
operational
mode
Configure the
STP-Ignore
attribute of
VLANs on a
Switch
Specify a Switch
as the root or
backup root
bridge
Switch C and Switch D:
Intermediate Switches in the
Switched network
S w itc h F S w itc h F
Default Value Note
The STP feature is The configuration of STP feature status on
disabled from the the port will not take effect if the STP
Switch, but will be feature is disabled from the Switch.
enabled on all
ports once being
enabled on the
Switch.
The Switch works If there are Switches respectively running
in RSTP mode. STP and RSTP on the network, it is
recommended to set the Switch in
STP-compatible mode.
No VLAN on a Once a VLAN is specified to be
STP-enabled STP-Ignored, the packets of this VLAN will
Switch is be forwarded on any Switch port, with no
STP-Ignored. restriction from the calculated STP path.
The role of the A Switch can be made the root bridge by
current Switch as specifying its Bridge preference to 0.
the root or backup
root bridge
depends on the
STP calculation.
RSTP Configuration
Switch E, Switch F and Switch
G: Switches directly
connected with user PCs
S w itc h B S w itc h B
S w itc h D S w itc h D
S w itc h G S w itc h G
173