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To forward untagged traffic, an access interface must have an add-tag action, add-and-
change, or add-2-tags action applied to untagged frames, assigning the traffic to a VLAN.
An edge or access link interface can be associated with a particular VLAN either through
a VLAN membership or through a tag-action, but not through both.
Interfaces can be associated with additional VLANs through memberships or tag-actions.
An interface role cannot be modified when it is assigned a tag-action.
The E-Series can perform the following tag actions on a VLAN that has IGMP enabled:
Add-tag action to untagged Ethernet frames
Change-tag action to change the VLAN ID at network administrative boundaries
If no matching criterion is assigned to a tag action, then the tag action is performed on all
packets entering the specified interface, except for the packet traffic on VLANs that have
an associated membership with the interface. When the match rule is set to ignore and p-
bit any that is the same as no matching criterion assigned. You can see this if you create a
tag action and leave those fields blank. It will be set to ignore.
For double-tagged packets, the outer VLAN ID must match a provisioned VLAN. The
inner tag does not have to match a provisioned VLAN ID.
A priority tagged frame has a new tag added or changed-to with the specified tag value.
Upon egress, the frame still carries the original priority bits onto the newly added or
change-to VLAN tag.
If an Ethernet interface has both a VLAN tag action and a policy map applied, the tag
action function is applied to the interface before the policy map function.
Example add-tag-action configurations
Create an action to add a tag (VLAN 400)
to all traffic on the associated interface.
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