qrcoder c# example VLAN Tag Support in Objective-C

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Protocol, Link Aggregation Control Protocol, and so on) The Service Provider can, using this attribute, decide whether to process or discard these protocols at the UNI or pass them to the EVC to discard or tunnel them
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VLAN tag support provides another important set of capabilities that affect service frame delivery and performance This UNI service attribute allows Ethernet service frames to be 8021Q tagged or untagged They can also be used to determine how the frames should then be handled, and if tagged, whether the VLAN ID is used to determine frame delivery
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UNI pairs for an EVC may support different VLAN tags (one may support it, the other may not; this is useful in service multiplexing described in the next section)
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When VLAN tags at the UNI are supported by the Service Provider, then the subscriber needs to knows this and also the action preserved or discarded or stacked if any, taken by the Service Provider Provider Versus Customer VLAN tag A Service Provider may add an additional VLAN tag to the incoming service frame header to separate from and preserve the customer s VLAN tag, using VLAN stacking (also referred to as Q-in-Q) The MEF has defined the term Customer Edge VLAN ID (CE-VLAN ID) to represents the customer s VLAN ID; this tag also contains the 8021p field that the MEF has termed CE-VLAN CoS The MEF has defined two service attributes regarding CE-VLAN tag support: CE-VLAN ID preservation and CE-VLAN CoS preservation The CE-VLAN tag consists of both the CE-VLAN ID and CE-VLAN CoS, so a service may preserve one, both, or neither The CE-VLAN ID preservation is an EVC service attribute that defines whether it is preserved across the EVC or not (if not, it is mapped to another value) This is useful for services such as LAN extension The CE-VLAN CoS preservation is an EVC service attribute that indicates whether the 8021p bits are preserved across the EVC or not (if not, it is mapped to another value) CE-VLAN IDs must be mapped when one UNI of a pair supports tagging whereas the other does not
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Service multiplexing provides the ability for a UNI (a physical interface) to support multiple EVCs and precludes the need for a separate physical interface to support each EVC As illustrated in Figure 29, there are multiple EVCs between UNI A and other UNIs in a network (assume that UNI A is at a higher bandwidth physical interface than the other UNIs) By service multiplexing at UNI A, multiple EVCs can be accommodated without needing multiple physical interfaces at UNI A Service multiplexing reduces the CAPEX associated with deploying services because it reduces the physical equipment costs One or fewer physical interfaces are required instead of many; likewise, this reduces the amount of ancillary equipment needed, such as cables It also reduces the OPEX by enabling quick and remote provisioning of new services The bundling service attribute allows two or more CE VLAN IDs to be mapped to a single EVC at a UNI These VLANs and the mapping specifics (ie, which
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Carrier Ethernet
UNI B UNI C EVC 2 MEN
EVC 1
Service Multiplexing at UNI A
UNI D EVC 3
UNI A
Service Multiplexing (Source: MEF)
VLANs map to which EVCs) should be agreed to by the end user and the service provider A special case of bundling, all to one bundling, is enabled when all the VLAN IDs at a UNI are mapped to a single EVC Security filters enable filtering of undesirable Ethernet frames to maintain security or traffic management A very plausible case is one wherein a enduser subscriber wants only Ethernet frames originating from specific known sources (identified by the source MAC addresses) to be granted access; any other frames would be considered spurious and dropped, and the user alerted This is akin to simple Access Control Lists (ACLs) at a UNI
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