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Cisco IP Solution Center L2VPN and Carrier Ethernet User Guide, 6.0
Chapter 5 Creating a FlexUNI/EVC ATM-Ethernet Interworking Policy
Setting the FlexUNI Attributes
Step 6 Continue with the steps contained in the next section, Setting the VLAN Matching Criteria Attributes,
Setting the VLAN Matching Criteria Attributes
Prior to the introduction of the FlexUNI capability, service providers could either deploy
service-multiplexed services (ERS/ERMS or EVPL/EVCS) or service-bundled services on a single port.
Both could not be supported simultaneously due to the limitations in the infrastructure, which only
allowed matching the outer-most VLAN tag.
One of the key benefits of FlexUNI/EVC support in ISC is to provide a flexible means to examine the
VLAN tags (up to two levels) of the incoming frames and associate them to appropriate Ethernet Flow
Points (EFPs). This allows service providers to deploy simultaneously both the service-multiplexed and
service-bundled services on a single port.
To set the FlexUNI VLAN matching criteria attributes, perform the following steps.
Step 1 Check the Both Tags check box to enable service requests created with the policy to match both the inner
and outer VLAN tags of the incoming frames.
If you do not check this check box, service requests created with the policy will match only the outer
VLAN tag of the incoming frames.
Checking the Both Tags attribute causes the Inner VLAN Ranges attribute (covered in the next steps) to
appear in the FlexUNI Attribute window.
Step 2 Check the Inner VLAN Ranges check box to enable the range of inner VLAN tags to be specified
during service request creation.
If the check box is unchecked, the range of inner VLAN tags are not allowed. In this case, the operator
must specify discrete VLAN IDs during service request creation.
Step 3 Continue with the steps contained in the next section, Setting the VLAN Rewrite Criteria Attributes,
Setting the VLAN Rewrite Criteria Attributes
Together with VLAN matching criteria, VLAN rewrite makes the FlexUNI/EVC infrastructure very
powerful and flexible. The following VLAN rewrite options are supported:
• Pop one or two tags.
• Push one or two tags.
• Translation (1:1, 2:1, 1:2, 2:2).
Be aware of the following considerations when setting the VLAN rewrite criteria attributes:
• Only one kind of rewrite can be done on every CE-facing FlexUNI link.
• All VLAN rewrites are done using the symmetric keyword on the ingress traffic (for example,
rewrite ingress tag pop 2 symmetric).