Administrator's Guide v4.1.1 Manual

• Default VLAN 1 is not implicitly created in this mode.
• Native VLAN commands that are applicable in default-VLAN trunk mode are not supported in this
mode.
• Native VLAN commands that are applicable in this mode are not supported in default-VLAN trunk
mode.
Because of the different mode behaviors, the user must be aware of the following:
• A port in default-VLAN trunk mode cannot use the new classifications. For example, an AMPP profile
port operates in default-VLAN trunk mode and therefore the new classifications are not supported in
this case.
• When a port is configured in this mode there is no assumption that VLAN 1 exists. The default VLAN
1 must be configured explicitly. For example, PVST VLAN 1 is not enabled on an interface unless
that VLAN is configured explicitly.
The following commands are used to support different native VLAN configurations:
• switchport mode trunk-no-default-native
• [no] switchport trunk native-vlan-untaggedvid
• [no] switchport native-vlan-xtagged vid [ctag cvid] egress [tagged | untagged | any]
The service and transport VF native VLAN classifications and the role of the respective commands are
summarized below.
Service and transport VF native VLAN classificationsTABLE 65
Ingress allowed frame type Egress
tagging:
Untagged
only
Egress
tagging:
Tagged only
CLI commands
None N/A N/A switchport mode trunk-no-default-native
Untagged only Yes N/A switchport trunk native-vlan-untagged vid
Tagged only N/A Yes Use regular VLAN classification: switchport
trunk allow vlan add vid [ctag cvid]
Untagged and tagged Yes Yes switchport trunk native-vlan-xtagged vid
[ctag cvid] [ctag cvid] egress [untagged |
tagged | any]
The following configuration rules apply in no-default-native-VLAN trunk mode.
Rules for the switchport trunk-no-default-native command:
• There is no automatic native VLAN configuration.
‐ VLAN 1 is not created automatically when the port is configured in this mode.
‐ VLAN 1 is not a default VLAN. It is just another C-TAG that is available for classification.
‐ The user can explicitly create VLAN 1 to achieve a default-VLAN trunk mode configuration,
by using the switchport trunk allow vlan add vid command.
• An untagged or unclassified frame is discarded by default.
• All switchport configurations except the following native VLAN commands in default-VLAN trunk
mode continue to be supported:
Configuring Virtual Fabrics
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