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[BTI] PVX configuration example to untag a customer VLAN (aka Virtual Untagged)

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Article ID: KB32750 KB Last Updated: 26 Apr 2019Version: 3.0
Summary:

This article provides an example of how to configure an Ethernet Service and a UNI port to remove or add a customer-VLAN and send and receive packets as untagged. UNIs that are configured as virtual-multiple are also included for comparison.

 

Solution:

Example scenario: On one end of the eservice, packets are sent and received with a C-VLAN of 10 (also known as customer VLAN); on the other end, one port requires the packets to be untagged, whereas the other requires the original C-VLAN of 10 to be retained.

To remove or add the customer VLAN and send and receive packets as untagged, the UNI service-type must be set to virtual-untagged (see syntax below in blue) and the c-pvid set to the desired c-vlan (aka customer VLAN).  To configure a UNI to retain the customer VLAN, set the UNI service-type to Virtual Multiple.

  • Node A has two UNI ports – one will be configured for untagged packets.  The other will be configured for packets tagged with C-VLAN 10, using a third-party enterprise switch to do the job of tagging and untagging.  
  • Node C has one UNI port, configured for packets tagged with C-VLAN 10. 
  • Node B does not require any special configuration; it only requires that GVRP is enabled (default).

In the example, the following topology is used to demonstrate the various scenarios and UNI service-types for comparison.  Configuration commands are provided for Node A and Node C to achieve the example scenario.

 

Topology

 
Node A Configuration:
enable
conf t

virtual-switch 1
!
int tengig 1/1/2
mtu 1522
exit
int gig 1/1/11
mtu 1522
exit
!
uni tengig 1/1/2
frame 1522
service-type virtual-multiple
c-pvid 0
exit
uni gig 1/1/11
frame 1522
service-type virtual-untagged
c-pvid 10
exit
!
eservice Video_East type EVPLAN
s-vlan 102
admin-state enable
uni TenGig 1/1/2
  c-vlan 10
  exit
uni gig 1/1/11
  exit
exit
end
!
Node C Configuration:
enable
conf t

virtual-switch 1
!
int gig 1/1/11
mtu 1522
exit
!
uni gig 1/1/11
frame 1522
service-type virtual-multiple
c-pvid 0
exit
!
eservice Video_East type EVPLAN
s-vlan 102
admin-state enable
uni gig 1/1/11
  c-vlan 10
  exit
exit
end
!

 

Modification History:

2018-07-12: Minor modifications made (non-technical)
2019-04-26: clarification added about virtual-untagged.

 

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