User manual ALCATEL-LUCENT 7450 APPLICATION NOTE

[. . . ] APPLICATION NOTE Alcatel-Lucent Service Router Ethernet OAM Enabling a new level of operational efficiency in Ethernet service networks Abstract In response to the growing demand for new consumer and business services, service providers are building highly scalable, cost-effective IP/MPLS networks. These networks are being used to deliver a growing volume of Carrier Ethernet services. To assure the quality, performance and reliability of their Carrier Ethernet services, providers need a complete set of operations, administration and maintenance (OAM) tools for Ethernet services and the networks on which they are delivered. Service providers need to be able to troubleshoot Ethernet services and the network from the provider edge all the way to the last mile. [. . . ] · MACtraceroutemessage­ Unlike the CC signals, which can be enabled to beacon continuously, the traceroute signal is sent on demand. The MAC traceroute command uses a VLAN ID and a MAC address as the parameters to trace the path to another maintenance point (MEP) in the domain. 6. MPLS Path and PWE3 OAM 6. 1 Overview As the transformation to MPLS-based Carrier Ethernet networks gains momentum, MPLS OAM has become critical for maintaining service levels. A converged MPLS core network allows global reach and connectivity between MPLS/VPLS metros, withflexibleaccessnetworks. AfullsuiteofcontrolanddatastandardsforVPLS, VLL, Circuit Emulation Service over Packet Switched Network (CESoPSN) and Structure Agnostic TDM over Packet services allows standards-based service delivery of Ethernet, Frame Relay, ATM and even TDM over IP/MPLS. IP/MPLS supports any underlying physical media, including both Ethernet and legacy media types. This is how the Alcatel-Lucent Service Router provides an industry-leading Ethernet service delivery solution on a Terabit platform, regardless of the varied underlying physical transport. Consistent with the goal to provide the most comprehensive MPLS path and circuit OAM tools, the Alcatel-Lucent Service Router provides comprehensive data plane and control plane verifications. For this section, the MPLS OAM tools are subdivided into two groups: MPLS OAM tools and pseudowire emulationedgetoedge(PWE3)OAMtools. (ThelatterarealsoknownasVLLOAMtools. ) TheMPLSOAMtoolsincludeLSPpingandLSPtrace. ThePWE3OAMtoolsincludeVCCVping, VCCV traceroute and pseudowire status TLV signaling. With the LSP ping and LSP trace, a network operator can easily detect the following: LSP misrouting or loss of path, isolated configuration faults and packet forwarding faults on any point in the IP/MPLS network. Alcatel-Lucent Service Router Ethernet OAM | Application Note 7 Similarly, the VCCV tests verify a single virtual channel or pseudowire inside an LSP tunnel. With VCCV ping as a complement to LSP ping and LSP trace, a network operator has the ability to localize a connectivity fault on an emulated pseudowire service within an LSP tunnel. 6. 2 IP/MPLS OAM tool features and applications LSP ping and traceroute detect data plane failures in LSPs by verifying whether the packet reaches the label edge router (LER) and by providing the hop-by-hop destination path of the LSP. The Alcatel-Lucent Service Router supports the followings OAM messages: · LSPping­ Modeled after the familiar ICMP ping, LSP ping is an in-band OAM tool. For a given forwarding equivalence class (FEC), LSP ping can begin LSP path verification from the local ingress LER to the final egress LER. · LSPtrace­ To complement LSP ping, LSP trace tests the MPLS label switched router (LSR) control plane. LSP trace packets localize faults in an MPLS LSP tunnel by testing an LSP path across any transit LSRs, from the ingress LSR to the final egress LSR. LSP trace supports various parameters to enable fine-grain control, including the number of LSR hops, options between unidirectional or bidirectional traces, and selection of any specific egress paths in a multi-egress Equal Cost Multipath Protocol (ECMP) environment. Both LSP ping and LSP trace can test a tunnel setup by Label Distribution Protocol (LDP), LDP over Resource Reservation Protocol (LDPoRSVP) and even Generic Routing Encapsulation (GRE). As tunnel verification tools, all forwarding plane and data plane OAM packets are kept within the service provider network and not forwarded to the customer. 6. 3 PWE3 OAM tool features and applications PWE3OAMtoolsinclude: · VCCVping­ VCCV ping is used to check connectivity of a pseudowire within an LSP tunnel. As an in-band OAM tool, VCCV ping sends messages using the same encapsulation and along the same path as user packets in that pseudowire. · PseudowireStatusTLV­ Designed to provide end-to-end fault notifications with the ability to translate the pseudowire status notification into the native OAM protocol of the access circuit (that is ATM OAM, Frame Relay local management interface (LMI), Ethernet Access. 6. 3. 1 VCCV ping The Alcatel-Lucent Service Router supports VCCV ping over both a single-segment pseudowire and a multi-segment pseudowire (as shown in Figures 4 and 5). With the growing numbers of interdomain MPLS deployments using pseudowires to transport Ethernet, Frame Relay, ATM and TDM traffic, multi-segmentpseudowiresenablecarrierstodeliverhighlyscalableandreliablePWE3 services through efficient signaling in very large services networks. Figure 4. [. . . ] The Alcatel-Lucent 5650 CPAM is a software application that manages the IP routing layer. It offers real-time control plane visualization, proactive control plane surveillance, configuration validation, and control plane diagnosis. In addition, through seamless integration with the Alcatel-Lucent 5620 SAM, the Alcatel-Lucent 5650 CPAM provides simplified diagnosis and intuitive visualization of the IP/MPLS infrastructure and its corresponding IP routing plane. 11. Conclusion Service providers need an effective Ethernet OAM toolkit to elevate their VLL (E-Line) and VPLS (E-LAN) service network operations to a new level of operational efficiency that will ultimately result in unprecedented simplification and cost-reductions. [. . . ]