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You can configure only one of the following attributes on a given VLAN on a given
interface:
Trunk interfaces:
VLAN member
Native VLAN
Edge interfaces:
VLAN member
Tag-action
Native VLAN
Access interfaces:
VLAN member
Tag-action
Trunk and Edge interfaces are always associated with at least one VLAN, through the
native VLAN attribute (VLAN 1, by default). Access interfaces do not support a Native
VLAN, however, tag actions can be used to assign untagged traffic to a VLAN ID.
All network connections (ERPS, RSTP, LAG, DHCP servers, multicast routers, IGMP-
enabled video servers, network-facing routers) are made on Trunk or Edge interfaces,
only.
Interfaces can be associated with additional VLANs through memberships or tag-actions.
If an Ethernet uplink Edge interface with tag actions (for double-tagged traffic) is on the
same card as Ethernet downlink Edge interfaces (that are members of the outer VLAN),
ingress double-tagged traffic from the downlink ports will not flow upstream, resulting in
a service interruption. As a workaround, for this application, ensure that one of the
following configurations are used:
The Ethernet uplink Edge port is on a different card than downlink Edge ports.
Ethernet downlink ports are configured with the Trunk interface role.
Note: For this application, if active/standby LAG is used for the uplink, you must
ensure that Ethernet downlink ports are configured with the Trunk role.
When a VLAN has DHCP snooping and Option 82 relay enabled, an Ethernet interface
can be directly added to the VLAN membership, but using a tag action to associate an
Ethernet interface to such a VLAN is not supported.
BPDU Guard and RSTP cannot be enabled on an interface, simultaneously.
For Policy maps:
For Trunk interfaces, any policy map assignment is allowed.
For Edge and Access interfaces, if a policy map contains a two-tag classification, the
edge or access link must have a tag-action that adds the outer tag being matched by
the class rule.
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