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Untagged port using vlan 2 as port native vlan – Brocade TurboIron 24X Series Configuration Guide User Manual

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Brocade TurboIron 24X Series Configuration Guide

573

53-1003053-01

PVST/PVST+ compatibility

Commands on the device

TurboIron(config)#vlan-group 1 vlan 2 to 4

TurboIron(config-vlan-group-1)#tagged ethernet 1

TurboIron(config-vlan-group-1)#exit

TurboIron(config)#interface ethernet 1

TurboIron(config-if-1)#dual-mode

TurboIron(config-if-1)#pvst-mode

These commands configure a VLAN group containing VLANs 2, 3, and 4, add port 1 as a tagged
port to the VLANs, and enable the dual-mode feature and PVST+ support on the port. The
dual-mode feature allows the port to send and receive untagged frames for the default VLAN (VLAN
1 in this case) in addition to tagged frames for VLANs 2, 3, and 4. Enabling the PVST+ support
ensures that the port is ready to send and receive PVST+ BPDUs. If you do not manually enable
PVST+ support, the support is not enabled until the port receives a PVST+ BPDU.

The configuration leaves the default VLAN and the port Port Native VLAN unchanged. The default
VLAN is 1 and the port Port Native VLAN also is 1. The dual-mode feature supports untagged
frames on the default VLAN only. Thus, port 1 can send and receive untagged BPDUs for VLAN 1
and can send and receive tagged BPDUs for the other VLANs.

Port 1 will process BPDUs as follows:

Process IEEE 802.1Q BPDUs for VLAN 1.

Process tagged PVST BPDUs for VLANs 2, 3, and 4.

Drop untagged PVST BPDUs for VLAN 1.

Untagged port using VLAN 2 as port native VLAN

Figure 91

shows an example in which a port Port Native VLAN is not VLAN 1. In this case, VLAN 1

uses tagged frames and VLAN 2 uses untagged frames.

FIGURE 91

Port Native VLAN 2 for Untagged BPDUs

To implement this configuration, enter the following commands.

Commands on the device

TurboIron(config)#default-vlan-id 4000

TurboIron(config)#vlan 1

TurboIron(config-vlan-1)#tagged ethernet 1

TurboIron(config-vlan-1)#exit

TurboIron(config)#vlan 2

TurboIron(config-vlan-2)#tagged ethernet 1

TurboIron(config-vlan-2)#exit

TurboIron(config)#interface ethernet 1

TurboIron(config-if-1)#dual-mode 2

TurboIron(config-if-1)#pvst-mode

TurboIron(config-if-1)#exit

Port 2

Port 1

Untagged IEEE BPDU for VLAN 1
Tagged PVST BPDU for VLAN 1
Untagged PVST BPDUs for VLAN 2

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