WebEML User Manual Administer VLAN configuration
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• UNI (VLAN based): this is an interface at the edge of the Provider Bridged
Network. S-VLAN is assigned based on C-VLAN ID carried by C-VLAN Tag or
based on User Ethernet port in case of untagged frames (C-tagged service
interface)
You can change the type of a Provider Bridge port. The following rules apply:
• An NNI can be changed to a port-based UNI only if the NNI was in the member
set and untagged set of only one S-VLAN.
• An NNI can be changed to a VLAN-based UNI only if the NNI was in the
untagged set of all S-VLANs it belonged to.
• A port-based UNI can be changed to an NNI or a VLAN-based UNI with no
restrictions about its S-VLAN membership. The new port type inherits the S-
VLAN membership and untagged set membership from the port-based UNI.
• A VLAN-based UNI can be changed to an NNI with no restrictions about its S-
VLAN membership. The NNI inherits the S-VLAN membership and untagged set
membership from the VLAN-based UNI. Any C-VLAN to S-VLAN assignments
must be removed from the VLAN-based UNI before changing it to an NNI.
• A VLAN-based UNI can be changed to a port-based UNI only if it was in the
member set and untagged set of only one S-VLAN. Any C-VLAN to S-VLAN
assignments must be removed from the VLAN-based UNI before changing it to
a port-based UNI.
23.2.3.1 Ethernet frames processing
When the NE is working in Provider Bridge mode, all the switches process Ethernet
frames according to S-VLAN Tag. The tag of a single tagged Ethernet frame or the
outer tag of a double tagged frame is recognized as an S-VLAN Tag according to the
port S-VLAN TPID.
23.2.3.2 Cross-connected flows processing
When the NE is working in Provider Bridge mode, cross-connected flows are
managed as single S-VLAN tagged frames. This implies that User Ethernet ports
being end-point of a cross-connection must be NNIs. The NE does not allow the set
of a cross-connection not having a NNI as end-point.
You cannot change a NNI to a UNI (port based) when cross-connections are present
that use the NNI as an end-point.
Release 7.0.0 3DB 19286 ACAA Issue 01
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