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Cisco IP Solution Center L2VPN and Carrier Ethernet User Guide, 6.0
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Appendix C Setting Up VLAN Translation
Setting Up VLAN Translation
• “B”—The PE VLAN that is the outer VLAN of the Q-in-Q port. You specify this in the “Outer
VLAN” field. You can choose this VLAN manually by entering a value, or you can choose the
AutoP ick check box to have one automatically assigned.
• “C”—The PE VLAN that the “A” and “B” VLANs are translated to. You specify this in the “VLAN
and Other Information” section above (on the L ink Attributes window). (See Figure C-4 and
Figure C-5.)
You must specify VLAN “A” (the CE VLAN) and VLAN “C” (the PE VLAN translated to). For VLAN
“B” (the Q-in-Q outer VLAN), what to specify depends on the UNI port type:
• If it is an empty port, you must spe cify VLAN “B.”
• If it is an existing Q-in-Q port, the n VLAN “B” has been defined, and it cannot be change d at this
point.
Some additional comments on 2:1 VLAN translation:
• For 2:1 VLAN translation, if you build an ERS (EVPL) service on an empty port, then this UNI port
will be provisioned as an ERS (EVPL) service. If you later add an EWS (EPL) service to the same
port, the EWS (EPL) service will overwrite the previous ERS (EVPL) provisioning. The major
difference between ERS (EVPL) and EWS (EPL) is the L2PT BPDU treatm ent. For ERS (EVPL),
BPDU is blocked. For EWS (EPL), BPDU is tunneled.
• As an ERS (EVPL) service, the 2:1 VLAN translation can share the same port, just like a regular
ERS (EVPL) port.
• An ERS (EVPL) 2:1 service can be added on top of an existing EWS (EPL) service.
Upon completion of the service request cr eation, ISC does an integrity check before saving the service
request. For 2:1 VLAN translation, ISC rejects the service request if the CE VLAN and outer tag PE
VLAN combination has been used for anot her 2:1 VLAN translation on the same port.
Modifying a Service Request
For both 1:1 and 2:1 VLAN translation, you can perform the following modifications on an existing
service request:
• Change to a new CE VLAN to be translated from.
• All other normal changes for a service request are permitted.
However, the following modifications are not allowed:
• You cannot change the VLAN translation type for a given AC. For instance, you canno t change from
2:1 to 1:1 VLAN translation.
• You cannot change the place where 2:1 VLAN translation occurs.
Deleting a Service Request
During service request deletion, the following resources are released:
For 1:1 VLAN translation:
• The CE VLAN becomes available to be translated again.
• The PE VLAN is released.
• If the link being deleted is the last link on the UNI port, then this port is set to new.
For 2:1 VLAN translation: