Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 383)

Multi-Service IronWare Switching Configuration Guide 353
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PVST or PVST+ compatibility
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Configuration examples
The examples use two common configurations:
• Untagged IEEE 802.1Q BPDUs on VLAN 1 and tagged PVST+ BPDUs on other VLANs
• Tagged IEEE 802.1Q BPDUs on VLAN 1 and untagged BPDUs on another VLAN
Tagged port using default VLAN 1 as its port native VLAN
In Figure 64 , a PVST+ configuration uses VLAN 1 as the untagged default VLAN and VLANs 2, 3,
and 4 as tagged VLANs.
FIGURE 64 Default VLAN 1 for untagged BPDUs
To implement this configuration, enter the following commands on the Brocade device.
Brocade(config)# vlan-group 1 vlan 2 to 4
Brocade(config-vlan-group-1)# tagged ethernet 1/1
Brocade(config-vlan-group-1)# exit
Brocade(config)# interface ethernet 1/1
Brocade(config-if-e10000-1/1)# pvst-mode
These commands configure a VLAN group containing VLANs 2, 3, and 4, add port 1/1 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’s native VLAN unchanged. The default VLAN
is 1 and the port’s Port Native VLAN also is 1. The dual-mode feature supports untagged frames on
the default VLAN only. Thus, port 1/1 can send and receive untagged BPDUs for VLAN 1 and can
send and receive tagged BPDUs for the other VLANs.
Port 1/1 will process BPDUs as follows:
• Process IEEE 802.1Q BPDUs for VLAN 1.
TABLE 56 CLI display of PVST+ information
This field... Displays...
Port The 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.