encapsulation dot1ad dot1q
To define the matching criteria to be used in order to map single-tagged 802.1ad frames ingress on an interface
to the appropriate service instance, use the encapsulation dot1ad dot1q command in subinterface configuration
mode. To delete the matching criteria to map single-tagged 802.1ad frames ingress on an interface to the
appropriate service instance, use the no form of this command.
encapsulation dot1ad vlan-id dot1q {vlan-id}
no encapsulation dot1ad vlan-id dot1q {vlan-id}
Syntax Description
Indicates that the IEEE 802.1ad provider bridges encapsulation type is used for the
outer tag.
dot1ad
Indicates that the IEEE 802.1q standard encapsulation type is used for the inner tag.dot1q
VLAN ID, integer in the range 1 to 4094.
A hyphen must be entered to separate the starting and ending VLAN ID values that
are used to define a range of VLAN IDs. (Optional) A comma must be entered to
separate each VLAN ID range from the next range.
vlan-id
Command Default
No matching criteria are defined.
Command Modes
Subinterface configuration
Command History
ModificationRelease
This command was introduced.Release 3.9.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
The outer VLAN tag is an 802.1ad VLAN tag, instead of an 802.1Q tag. An 802.1ad tag has an ethertype
value of 0x88A8, instead of 0x8100 that 802.1Q uses.
Some of the fields in the 802.1ad VLAN header are interpreted differently per 802.1ad standard. A tunneling
ethertype command applied to the main interface does not apply to an 802.1ad subinterface.
An interface with encapsulation dot1ad causes the router to categorize the interface as an 802.1ad interface.
This causes special processing for certain protocols and other features:
•
MSTP uses the IEEE 802.1ad MAC STP address instead of the STP MAC address.
Cisco ASR 9000 Series Aggregation Services Router VPN and Ethernet Services Command Reference, Release
6.1.x
6
Ethernet Interfaces Commands
encapsulation dot1ad dot1q
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