Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 320)

NOTE
If 802.1W and pvst-mode (either by auto-detection or by explicit configuration) are enabled on a
tagged VLAN port, 802.1W will treat the PVST BPDUs as legacy 802.1D BPDUs.
Enabling dual-mode support
To enable the dual-mode feature on a port, enter the following command at the interface configuration
level for the port.
device(config-if-1/1)#dual-mode
Syntax: [no] dual-mode [vlan-id]
The vlan-id specifies the port Port Native VLAN. This is the VLAN on which the port will support
untagged frames. By default, the Port Native VLAN is the same as the default VLAN (which is VLAN 1
by default).
For more information about the dual-mode feature, refer to Dual-mode VLAN ports on page 420.
Displaying PVST+ support information
To display PVST+ information for ports on a Brocade device, enter the following command at any level
of the CLI.
device#show span pvst-mode
PVST+ Enabled on:
Port Method
1/1 Set by configuration
1/2 Set by configuration
2/10 Set by auto-detect
3/12 Set by configuration
4/24 Set by auto-detect
Syntax: show span pvst-mode
This command displays the following information.
CLI display of PVST+ information TABLE 51
Field Description
Port The Brocade port number.
NOTE
The command lists information only for the ports on which PVST+ support is enabled.
Method The method by which PVST+ support was enabled on the port. The method can be one of the following:
• Set by configuration - You enabled the support.
• Set by auto-detect - The support was enabled automatically when the port received a PVST+ BPDU.
Enabling dual-mode support
320 FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
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