Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 308 of 669
Note
: MAC learning is enabled for EVCs with more than two ports so that source addresses are learned
for frames matching the EVC.
An Ethernet Private Tree service can give subscribers the opportunity to interconnect multiple sites to
provide services other than those resembling a LAN. This type of service is known as a rooted multi-point
service because the root is able to communicate with the leaves but the leaves are not able to
communicate. CE-VLAN tag preservation and tunneling of L2CP frames are features of an EP-Tree
service where each UNI associated by an EVC has one EVC. An Ethernet Virtual Private Tree service
can be used to interconnect participating UNIs to a well-defined access, or root point. For example if a
customer has an EVP-LAN service providing data connectivity between four UNIs while using an EVP-
Tree service to provide video broadcasts from a video hub location. In an EVP-Tree service, at least one
CE-VLAN ID is mapped to each EVC.
An E-Access service type can be used to create a broad range of Ethernet access services. An Access
EPL service can provide a high degree of transparency for frames, similar to an EPL service such that the
frames header and payload upon ingress at the UNI is delivered unchanged to the ENNI with the addition
of an S-VLAN tag. The S-VLAN tag is removed upon delivery to the UNI from the ENNI. A Service
Provider can use an Access EPL service from an Access Provider to deliver port-based Ethernet
services. At the SP ENNI a unique SVLAN ID per Access EPL maps to a single OVC, or Operator Virtual
Connection End Point. The Service Provider and Access Provider coordinate the value of the S-VLAN ID
at the ENNI. There is no need for coordination between the Subscriber and Service Provider because all
Service Frames at the UNI are mapped to a single OVC End Point. Alternatively, an Access EVPL can
support multiple service instances including a mix of Access and EVC services.
An example Access
EVPL
service with two OVCs is provisioned with two OVC End Points on device 1.
OVC EP1 will pass single tag frames with CE-VLAN ID 1 and OVC EP2 will pass single tag frames with
CE-VLAN ID 2 on UNI Port 2 ingress. Device 2 also has two OVC End Points. OVC EP3 is mapped on
device 2 and double tagged frames with S-VLAN ID 11 and CE-VLAN ID 1 will be seen on egress ENNI
port 2.5GigabitEthernet 1/2. OVC EP 4 is mapped to device 2 and will have double tagged frames with S-
VLAN ID 2 and CE-VLAN ID 2 on the same egress ENNI.
Device 1:
#conf t
(config)#no int vlan 2-4094
(config)#int Gi 1/2-4 2.5Gi 1/1-2
(config-if)#switchport mode hybrid
(config-if)#exit
(config)#int 2.5GigabitEthernet 1/2
(config-if)#switchport hybrid port-type s-port
(config-if)#exit
(config)#evc 1 vid 11 ivid 1001 interface 2.5GigabitEthernet 1/2
(config)#evc 2 vid 22 ivid 1002 interface 2.5GigabitEthernet 1/2
