Untagged port using vlan 2 as port native vlan – Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Switching Configuration Guide
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PVST or PVST+ compatibility
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•
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
In
, a port’s Port Native VLAN is not VLAN 1. In this case, VLAN 1 uses tagged frames and
VLAN 2 uses untagged frames.
FIGURE 65
Port Native VLAN 2 for untagged BPDUs
To implement this configuration, enter the following commands on the Brocade device.
Brocade(config)# default-vlan-id 4000
Brocade(config)# vlan 1
Brocade(config-vlan-1)# tagged ethernet 1/1
Brocade(config-vlan-1)# exit
Brocade(config)# vlan 2
Brocade(config-vlan-2)# untagged ethernet 1/1
Brocade(config-vlan-2)# exit
Brocade(config)# interface ethernet 1/1
Brocade(config-if-e10000-1/1)# pvst-mode
Brocade(config-if-e10000-1/1)# exit
These commands change the default VLAN ID, configure port 1/1 as a tagged member of VLANs 1
and 2, and enable PVST+ support on port 1/1. Since VLAN 1 is tagged in this configuration, the
default VLAN ID must be changed from VLAN 1 to another VLAN ID. Changing the default VLAN ID
from 1 allows the port to process tagged frames for VLAN 1. VLAN 2 is the port native VLAN. The
port processes untagged frames and untagged PVST BPDUs on VLAN 2.
Port 1/1 will process BPDUs as follows:
•
Process IEEE 802.1Q BPDUs for VLAN 1.
•
Process untagged PVST BPDUs for VLAN 2.
•
Drop tagged PVST BPDUs for VLAN 1.
Note that when VLAN 1 is not the default VLAN, the ports must have an untagged VLAN enabled in
order to process IEEE 802.1Q BPDUs.
For example, the following configuration is incorrect.
Brocade(config)# default-vlan-id 1000
Brocade(config)# vlan 1
Brocade(config-vlan-1)# tagged ethernet 1/1 to 1/2
Brocade(config-vlan-1)# exit
Brocade(config)# interface ethernet 1/1
Brocade(config-if-e10000-1/1)# pvst-mode
Brocade(config-if-e10000-1/1)# exit
Brocade(config)# interface ethernet 1/2
Brocade(config-if-e10000-1/2)# pvst-mode
Brocade(config-if-e10000-1/2)# exit