Service Path Trace. Overview CHAPTER

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1 CHAPTER 8 The following topics describe the Cisco MPLS Assurance Manager 1.0 (Cisco MPLS-AM) service path trace feature for Layer 3 Multiprotocol Label Switching (MPLS) virtual private network (VPNs) and Layer 2 Traffic Engineering (TE) tunnels and pseudowires. The following sections describe service path trace for MPLS VPNs, TE tunnels and pseudowires: Overview, page 8-1 for MPLS VPNs, page 8-3 for TE Tunnels, page 8-4 for Pseudowires, page 8-6 Note Service path trace is provided with the Cisco Active Network Abstraction 4.0. These topics cover the Cisco MPLS-AM service path trace features. See the Cisco Active Network Abstraction 4.0 User and Administration Guide for an introduction to the ANA service path trace functions and GUI in ANA. Overview The Cisco MPLS-AM service path trace feature traces service routes or network connectivity between two points in the network (or from a single starting point to an IP) for multiple networking layers along single as well as multiple routes. End-to-end paths are provided across technologies and at different layers of the stack. Service path trace shows the relevant technology properties of the traced path to help you identify the cause of the service degradation. Service path trace identifies where the service affecting problems exist (namely, devices, slots, ports, protocol stacks, including comprehensive multilayer status information with relevant configuration and traffic parameters). You can initiate service path trace for MPLS VPNs, TE tunnels, and pseudowires from the Inventory and Monitoring perspectives. Table 8-1 shows the locations in the ANA GUI where service path trace can be started. 8-1

2 Overview Chapter 8 Table 8-1 for MPLS VPNs, TE Tunnels, and Pseudowires Perspective Object Overview Monitoring MPLS VPN Display the MPLS VPN drawer. Display a VPN. In the VPN IA Inventory tab, expand the Impacted Sites or Non-Impacted Sites items. Expand the Sites. Right-click an AC Service to display the option. Pseudowire Display the Pseudowires drawer. Expand the Impacted Pseudowires or Non-Impacted Pseudowires items. In the Pseudowires tab in the workspace, right-click a pseudowire to display the option. TE Tunnel Display the TE Tunnel drawer Expand the Impacted TE Tunnels or Non-Impacted TE Tunnels items. In the TE Tunnels tab in the workspace, right-click a TE Tunnel to display the option. Inventory Pseudowire Display the Devices drawer Select a device. In the Logical Inventory tab, double-click Pseudowires. The pseudowires connected to the device are displayed in a tab in the workspace. Right-click a pseudowire to display the option. TE Tunnel Display the Devices drawer Select a device. In the Logical Inventory tab, double-click MPLS TE Tunnel. The TE tunnels originating from the device are displayed in a tab in the workspace. Right-click a TE tunnel to display the option. You can open and view service path trace information between service endpoints (for example, the IP interface which is attached to the VRF) over a MPLS network. The Label Switch Path (LSP) in the MPLS network is found according to the cross connect table of each router. Note The LSP can be traced and displayed by service path trace as part of an end-to-end tracing of a service as well. For example, when viewing a path between one customer edge to another. The service path trace traces the path which goes over circuits or VLANs in the access networks and LSP between the VRFs going through all the intermediate devices, namely, CEs, aggregation switches, PEs, and core routers. 8-2

3 Chapter 8 for MPLS VPNs To view a specific path you must specify an initial point like an IP interface and a destination IP address (optional). If the traced circuit (for example, VC, VLAN) ends in a router, service path trace finds the next hop according to the destination IP address. for MPLS VPNs The service path trace can be invoked from an Asynchronous Transfer Mode (ATM) Virtual Circuit (VC), data link connection identifier (DLCI,) IP Interface (in the physical inventory) or from a TE tunnel or pseudowire (in the Logical inventory) entry point. The virtual route is found according to the cross connect table of each ATM switch or Frame Relay device. The IP routing and path finding process is enabled according to the VRF routing tables on each router. To view a specific path you must specify an initial point like Virtual Path Identifier (VPI)/Virtual Channel Identifier (VCI), DLCI, Ethernet port or IP interface and a destination IP address. If you specified VC information or DLCI information, which ends in a router, the service path trace finds the next hop according to the specified destination IP address. If you do not specify the destination IP address, the system uses the default gateway in the router. The related business tags that are referred to the physical or logical entities are also displayed. Service path trace uses VRF routing and label switching information to trace the path from one VRF interface to another. The Multi-Path window is displayed showing the VPN topology map. From this window you can open the Single-Path window with the appropriate VPN information displayed in the Layer 2 and Layer 3 tabs. For Layer 3 path information Cisco MPLS-AM uses VRF routing and label switching information to trace the path from one VRF interface to another. Layer 3 service path trace information is displayed in the tab when the path goes over connections and ends in VRFs. Running for an MPLS VPN To run service path trace for MPLS VPNs, complete the following steps: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 From the Window menu, choose Open Perspective > Inventory. Click the MPLS VPN drawer. Double-click the Impacted VPNs or Non-Impacted VPNs item containing the VPN where you want to run the service path trace. Right-click the VPN and choose Topology > Logical View. The VPN logical view appears in the workspace. You will use the topology to find the AC service and destination IP address for the service path trace. From the IA Inventory tab beneath the navigation area, double-click the Impacted Sites or Non-Impacted Sites item containing the VPN where you want to run the service path trace, Double-click the site to display the ACs. Right-click the ACService and choose > From Here to IP Destination. From the Path Information dialog box, enter the destination IP, then click OK. The tab appears in the workspace with the timestamp. The service path trace is displayed in the Multi Path tab by default. 8-3

4 for TE Tunnels Chapter 8 Step 9 Click the SPT Properties tab beneath the service path trace topology. By default, Layer 1 properties are shown. Step 10 From the layer selector on the right, choose Layer 3. The table displays the following Layer 3 VPN information: combination of the interface name and IP address used to reach the Site. Each Site belongs to a Step 11 IP Address The IP address of the interface. Mask The mask of the specific network. State The state of the interface, namely, Up or Down. Name The name of the VRF. Max Packet Size The maximum packet size for the link. To view an update to the service path trace, click the Run Again tool in the toolbar. for TE Tunnels Service path trace uses label switching information to trace the end-to-end path of a TE tunnel path from one PE router to another device. For TE tunnels, the service path trace tool enables you to: View a path or list of devices. View the following information for each network element: The relevant Layer 2 parameters for each interface along the path. Trace the path for the defined MPLS TE LSP across the network. The Multi-Path window is displayed showing the MPLS TE tunnel topology map. From this window you can open the Single-Path window with the appropriate MPLS TE tunnel information displayed in the Layer 2 tab. Running for a TE Tunnel To run a service path trace for a TE tunnel, complete the following steps: Step 1 Complete the following steps if you want to launch service path trace for a TE tunnel from a device. If you want to launch service path trace from the Monitoring perspective, go to Step 2. a. From the Window menu, choose Open Perspective > Inventory. b. Click the Device drawer. c. Double-click the folder containing the device that is the TE tunnel source or destination, either MAINTENANCE, MANAGED, UNMANAGED, or UNSUPPORTED, depending on the device category. d. Double-click the device. The Physical Inventory and Logical Inventory tabs appear below the navigation pane. 8-4

5 Chapter 8 for TE Tunnels Step 2 Step 3 Step 4 Step 5 e. From the Logical Inventory tab, double-click MPLS TE Tunnel. A list of TE tunnels that originate, terminate, or pass through the device appear as a MPLS TE Tunnel tab under the device tab in the workspace. f. Continue with Step 3. Complete the following steps if you want to launch service path trace from the Monitoring perspective: a. From the Window menu, choose Open Perspective > Monitoring. b. Double-click the TE Tunnel drawer. c. Double-click either the Impacted TE Tunnels or the Non-Impacted TE Tunnels. A list of impacted or non-impacted TE tunnels for the network appear as a tab in the workspace. Right-click the TE tunnel and choose. From the Path Information dialog box, verify the head end device destination IP address that is automatically populated, then click OK. The topology appears in the workspace with the timestamp at the top. The service path trace is displayed in the Multi Path tab by default. Click the SPT Properties tab beneath the service path trace topology. The following Layer 1 properties are shown: combination of the interface name and IP address used to reach the Site. Each Site belongs to a Ethernet Type The type of IEEE Ethernet connection, for example 10_BASE_T for 10Base-T (10 Mbps Ethernet over twisted pair cables with a maximum length of 100 meters) or 100_BASE_T (100 Mbps Ethernet over twisted pair cable.fiber-optic cable). Max Speed The maximum speed of the connection in Kbps. Operational Status The connection status. Step 6 From the layer selector on the right side of the SPT Properties tab, choose Layer 2. The following Layer 3 properties are displayed: combination of the interface name and IP address used to reach the Site. Each Site belongs to a Outer Label The MPLS label for the TE tunnel that distinguishes the LSP selection in the adjacent (next) device. Inner Label The MPLS label for the TE tunnel that distinguishes the LSP selection in the existing device. Hold Priority The tunnel s priority after path setup, when other tunnels try to remove it and claim its resources. MAC Address The device s MAC address. Tunnel Head End Device IP address of the tunnel head end device. Tunnel Admin State The operational state of the tunnel, namely, up or down, however: If the tunnel operational status is up, the tunnel admin state must also be up. If the tunnel admin state is down, the tunnel opererational status must also be down. Tunnel Tail End Device IP address of the tunnel tail end device. 8-5

6 for Pseudowires Chapter 8 Step 7 Tunnel Oper Statuses The operational state of the tunnel, namely, up or down, if the tunnel operational status is up, the Tunnel Admin State must also be up (see the Tunnel Admin Status properties for additional information). Duplex Specifies the type of Ethernet connection negotiation method, for example AUTO_NEGOTIATE, 1000_FULL_DUPLEX, 1000_HALF_DUPLEX, 100_FULL_DUPLEX, 100_HALF_DUPLEX, and 10_FULL_DUPLEX. (This property applies for each link, not for the overall TE tunnel. Tunnel Name The tunnel name. Tunnel Outbound Label The MPLS label for the TE tunnel that distinguishes the LSP selection in the adjacent (next) device. Distribution Protocol Specifies the distribution protocol, for example LDP (Label Distribution Protocol) or TDP (Tag Switching Protocol). Tunnel Setup Priority The tunnel s priority upon path setup. To view an update to the service path trace, click the Run Again tool in the toolbar. for Pseudowires Cisco MPLS-AM uses VC ID and label switching information to trace the path from one tunnel interface to another over the MPLS network. The service path trace also covers end-to-end Layer 2 VPN service paths from one customer edge (routers) to another, as part of Cisco MPLS-AM s capability of tracing service routes or network connectivity between two points in the network. The path goes over circuits (for example, a VC) or VLANs in the access networks and LSP between the Layer 2 tunnel edge. The Multi-Path window is displayed showing the VPN topology map for the relevant devices and links. From this window you can open the Single-Path window with the appropriate VPN information displayed in the Layer 2 and Layer 3 tabs. For Layer 2, Cisco MPLS-AM uses VC ID and label switching information to trace the path from one tunnel interface to another. Layer 2 service path trace information is displayed in the window when the path goes over pseudowires. Running for Pseudowires To run service path trace for pseudowires, complete the following steps: Step 1 Complete the following steps if you want to launch service path trace for a pseudowire from a device. If you want to launch service path trace from the Monitoring perspective, go to Step 2. a. From the Window menu, choose Open Perspective > Inventory. b. Click the Device drawer. c. Double-click the folder containing the device that is the pseudowire source or destination, either MAINTENANCE, MANAGED, UNMANAGED, or UNSUPPORTED, depending on the device category. d. Double-click the device. The Physical Inventory and Logical Inventory tabs appear below the navigation pane. 8-6

7 Chapter 8 for Pseudowires Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 e. From the Logical Inventory tab, double-click Pseudowires. A list of pseudowires that originate, terminate, or pass through the device appear as in the Pseudowires tab under the device tab in the workspace. f. Continue with Step 3. Complete the following steps if you want to launch service path trace from the Monitoring perspective: a. From the Window menu, choose Open Perspective > Monitoring. b. Double-click the Pseudowires drawer. c. Double-click either the Impacted TE Tunnels or the Non-Impacted TE Tunnels. A list of impacted or non-impacted TE tunnels for the network appear as a tab in the workspace. Right-click the pseudowire and choose. From the Path Information dialog box, enter the destination IP, then click OK. The topology appears in the workspace with the timestamp at the top. The service path trace is displayed in the Multi Path tab by default. Click the SPT Properties tab beneath the service path trace topology. The following Layer 1 properties are shown for each leg of the pseudowire path: combination of the interface name and IP address used to reach the Site. Each Site belongs to a Ethernet Type The type of IEEE Ethernet connection, for example 10_BASE_T for 10Base-T (10 Mbps Ethernet over twisted pair cables with a maximum length of 100 meters) or 100_BASE_T (100 Mbps Ethernet over twisted pair cable.fiber-optic cable). Max Speed The maximum speed of the connection in Kbps. Operational Status The connection status. From the layer selector on the right side of the SPT Properties tab, choose Layer 2. The following Layer 2 properties are for each leg of the pseudowire path: combination of the interface name and IP address used to reach the Site. Each site belongs to a Outer Label The details of the outer MPLS label. Inner Label The details of the inner MPLS label. MAC Address The MAC address. PseudoWire Name The name of the pseudowire. PseudoWire Operational Status The operational state of the tunnel, namely, up or down. Distribution Protocol Specifies the distribution protocol, for example LDP (Label Distribution Protocol) or TDP (Tag Switching Protocol). PseudoWire User Label The pseudowire user label. PseudoWire Vc Id The pseudowire virtual circuit ID. Duplex Specifies the type of Ethernet connection negotiation method, for example AUTO_NEGOTIATE, 1000_FULL_DUPLEX, 1000_HALF_DUPLEX, 100_FULL_DUPLEX, 100_HALF_DUPLEX, and 10_FULL_DUPLEX. To view an update to the service path trace, click the Run Again tool in the toolbar. 8-7

8 for Pseudowires Chapter 8 8-8