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A common set of Class of Service (CoS) definitions and associated performance guarantees, bandwidth increments for each CoS and maximum frame service need to be developed (some work has already begun in MEF) Equipment (both customer and network) needs to incorporate configuration management as defined in the E-LMI specification (MEF 16) This would enable such equipment to automate, and hence simplify configuring the increasingly sophisticated services Timing synchronization specifications have gained some urgency as carriers are beginning to migrate TDM services to converged Ethernet networks (MEF has begun addressing in the mobile backhaul project)
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A standard Carrier to Carrier interconnection specification is required (The E-NNI effort has commenced by the MEF) A standardized access interconnection for emerging access methods is required (MEF has begun developing the Service Node Interface, SNI) A dynamic control plane solution is required to enable automated provisioning Overcome the VLAN/MAC limitations (actively being addressed by the PBB, MPLS etc as noted previously in the chapter) Efficiently forcing customer specific traffic only on some backbone links (Multiple Registration Protocol, MRP, per IEEE 8021ak has begun focusing on this capability)
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Standardized SNI required to provide an efficient method of introducing resilient access solutions in the metro (MEF work underway) While fault management has been well defined, it is yet to be implemented in commercial equipment solutions
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Topology discovery tools in Network Management Systems to support Connection Admission Control (CAC) in an Ethernet network
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CAC is usually provided by Service Provider Provisioning systems, and so the Network Management systems should coordinate with Provisioning systems to ensure the delivery of stringent QoS
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NOTE
A distributed control plane is required to support large Carrier Ethernet networks CoS awareness in Layer 1 transport devices in access networks is required to preclude any speed mismatches
2
Standardized Management
Standards available but need to be implemented in commercial solutions (most of them support pre-standard versions) Require enhanced version of Link Aggregation that distributes Ethernet frames based on VLAN ID (not just on MAC/IP addresses; this forces service-related and associated OAM frames are pinned to same links through out the network)
As should be clear, some challenges are already being identified by forward looking Service Providers such as Verizon; in most cases, it must be noted that proprietary solutions have been adopted in the interim to address the challenges, as to not impede the progress of Carrier Ethernet deployment The service attributes, their respective definition and parameters for the MEF-defined UNI and EVC, which were discussed earlier in this chapter, are shown in Figure 2-24
EVC Attributes Service Attribute
EVC Type UNI List CE-VLAN ID Preservation CE-VLAN CoS Preservation Unicast Service Frame Delivery Multicast Service Frame Delivery Broadcast Service Frame Delivery Layer 2 Control Protocol Processing Service Performance
Service Attribute Parameters
Point-to-Point or Multipoint-to-Multipoint A list of UNIs (identified via the UNI Identifier service attribute) used with the EVC Yes or No Specifies whether customer VLAN ID is preserved or not Yes or No Specifies whether customer VLAN CoS (8021p) is preserved or not Specifies whether unicast frames are Discarded, Delivered Unconditionally or Delivered Conditionally Specifies whether multicast frames are Discarded, Delivered Unconditionally or Delivered Conditionally Specifies whether broadcast frames are Discarded, Delivered Unconditionally or Delivered Conditionally Discard or Tunnel per Protocol Specifies the Frame Delay, Frame Jitter and Frame Loss per EVC or frames within an EVC Identified via their CE-VLAN CoS (8021p) value
UNI Attributes Service Attribute
UNI Identifier Physical Medium Speed Mode MAC Layer Service Multiplexing UNI EVC ID CE-VLAN ID/EVC Map Max Number of EVCs Bundling All to One Bundling Ingress Bandwidth Profile Per Ingress UNI Ingress Bandwidth Profile Per EVC Ingress Bandwidth Profile Per CoS ID Layer 2 Control Protocol Processing Standard Ethernet PHY 10 Mbps, 100 Mbps, 1 Gbps or 10 Gbps Full Duplex or Auto Negotiation IEEE 8023-2002 Yes or No Defines whether multiple services can be on the UNI A string used identify an EVC, eg, NYCBldg1Rm102Slot22Port3EVC3 Mapping table of customer VLAN IDs to EVC The maximum number of EVCs allowed per UNI No or Yes Specifies that one or more customer VLAN IDs are mapped to an EVC at the UNI No or Yes (all customer VLAN IDs are mapped to an EVC at the UNI) None or <CIR, CBS, EIR, EBS> This Bandwidth profile applies to all frames across the UNI None or <CIR, CBS, EIR, EBS> This Bandwidth profile applies to all frames over particular EVC None or <CIR, CBS, EIR, EBS> This Bandwidth profile applies to all frames marked with a particular CoS ID over an EVC Discard, Peer or Pass to EVC per protocol
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