Changing The Spanning-Tree Mode - Cisco Catalyst 3120 Software Manual
Catalyst blade switch for hp
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Chapter 17
Configuring STP
Changing the Spanning-Tree Mode.
The switch supports three spanning-tree modes: PVST+, rapid PVST+, or MSTP. By default, the switch
runs the PVST+ protocol.
Beginning in privileged EXEC mode, follow these steps to change the spanning-tree mode. If you want
to enable a mode that is different from the default mode, this procedure is required.
Command
Step 1
configure terminal
Step 2
spanning-tree mode {pvst | mst |
rapid-pvst}
Step 3
interface interface-id
Step 4
spanning-tree link-type point-to-point
Step 5
end
Step 6
clear spanning-tree detected-protocols
Step 7
show spanning-tree summary
and
show spanning-tree interface
interface-id
Step 8
copy running-config startup-config
To return to the default setting, use the no spanning-tree mode global configuration command. To return
the port to its default setting, use the no spanning-tree link-type interface configuration command.
OL-12247-01
Purpose
Enter global configuration mode.
Configure a spanning-tree mode. All stack members run the same
version of spanning-tree.
•
Select pvst to enable PVST+ (the default setting).
•
Select mst to enable MSTP (and RSTP). For more configuration
steps, see
Chapter 18, "Configuring MSTP."
•
Select rapid-pvst to enable rapid PVST+.
(Recommended for rapid-PVST+ mode only) Specify an interface to
configure, and enter interface configuration mode. Valid interfaces
include physical ports, VLANs, and port channels. The VLAN ID range
is 1 to 4094. The port-channel range is 1 to 48.
(Recommended for rapid-PVST+ mode only) Specify that the link type
for this port is point-to-point.
If you connect this port (local port) to a remote port through a
point-to-point link and the local port becomes a designated port, the
switch negotiates with the remote port and rapidly changes the local
port to the forwarding state.
Return to privileged EXEC mode.
(Recommended for rapid-PVST+ mode only) If any port on the switch
is connected to a port on a legacy IEEE 802.1D switch, restart the
protocol migration process on the entire switch.
This step is optional if the designated switch detects that this switch is
running rapid PVST+.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
Configuring Spanning-Tree Features
17-15
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