Table Of Contents

Using Cisco ANA PathTracer in MPLS Networks

Cisco ANA PathTracer Tracing Capability

Using Cisco ANA PathTracer in MPLS Networks

Cisco ANA PathTracer Starting Points

Cisco ANA PathTracer Endpoints

Cisco ANA PathTracer Windows

Using Cisco ANA PathTracer for Layer 3 VPN

Using Cisco ANA PathTracer for Layer 2 VPN

Using Cisco ANA PathTracer for MPLS TE Tunnels

Viewing MPLS TE Tunnel Information

Using Cisco ANA PathTracer in MPLS Networks

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The following topics describe how you can use the Cisco ANA PathTracer for Layer 2 and Layer 3 VPNs, and for MPLS TE tunnels:

•Cisco ANA PathTracer Tracing Capability—Provides a brief description of Cisco ANA PathTracer.

•Using Cisco ANA PathTracer in MPLS Networks—Tells you how to use Cisco ANA PathTracer.

•Cisco ANA PathTracer Windows—Describes the Cisco ANA PathTracer multipath and single-path windows working environment and the information that can be viewed.

•Using Cisco ANA PathTracer for Layer 3 VPN—Tells you how to use the Cisco ANA PathTracer for Layer 3 VPNs, including opening the Cisco ANA PathTracer and viewing path information.

•Using Cisco ANA PathTracer for Layer 2 VPN—Tells you how to use the Cisco ANA PathTracer for Layer 2 VPNs, including opening the Cisco ANA PathTracer and viewing path information.

•Using Cisco ANA PathTracer for MPLS TE Tunnels—Tells you how to use the Cisco ANA PathTracer for MPLS TE tunnels, including opening the Cisco ANA PathTracer and viewing path information.

For more information about the Cisco ANA PathTracer, see the Cisco Active Network Abstraction 3.6.6 User Guide.

Cisco ANA PathTracer Tracing Capability

Cisco ANA PathTracer traces service routes or network connectivity between two points in the network (or from a single starting point to an IP address) providing performance information simultaneously 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 Open Systems Interconnection (OSI) stack. It also displays various traffic and error statistics for each link and for each hop, helping to pinpoint problems that may affect the service or cause service degradation.

Cisco ANA PathTracer identifies the location of the service-affecting problems (for example, devices, slots, ports, and protocol stacks, including comprehensive multilayer status information with relevant configuration and traffic parameters). Cisco ANA understands and is able to display the various services on the network due to the up-to-date knowledge of the network.

Cisco ANA PathTracer enables you to view multiple paths between the source and the destination (or from a source to number of destinations) in the Cisco ANA PathTracer multipath window, or to view a selected single path in the Cisco ANA PathTracer single-path window:

•Cisco ANA PathTracer multipath window—Displays all the discovered paths available between the selected source and destination, including devices and links.

•Cisco ANA PathTracer single-path window—Displays a single path available between the selected source and destination, as well as the subscribers and properties.

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Note For more information about Cisco ANA PathTracer single and multipath windows, see the Cisco Active Network Abstraction 3.6.6 User Guide

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Using Cisco ANA PathTracer in MPLS Networks

You can open and view Cisco ANA PathTracer information between service endpoints, for example, the IP interface that is attached to the VRF over an MPLS network. The LSP in the MPLS network is found according to the cross-connect table of each router.

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Note The LSP can be traced and displayed by Cisco ANA PathTracer as part of an end-to-end tracing of a service as well; for example, when viewing a path between one CE device to another. Cisco ANA PathTracer traces the path that goes over circuits or VLANs in the access networks. It also traces the LSPs between the VRFs going through all intermediate devices such as CE devices, aggregation switches, PE routers, and core routers.

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To view a specific path, you must specify an initial starting point, such as an IP interface and a destination IP address (optional). If the traced circuit (for example, a VC or VLAN) ends in a router, Cisco ANA PathTracer finds the next hop according to the destination IP address. When you select an endpoint, Cisco ANA extracts the relevant IP address from this point and uses it as the destination.

Cisco ANA PathTracer Starting Points

You can also open Cisco ANA PathTracer by right-clicking a starting point and entering the required destination IP address. Table 9-1 lists the Cisco ANA PathTracer starting points.

Table 9-1 Cisco ANA PathTracer Starting Points 

Element	Location	Start Options
IP Interface	•Inventory window. •Affected entity (enabled only if the affected entity has an IP interface).	•To IP Destination •Start Here
Site	Service view map.	•To IP Destination •To Subnet Destination •Start Here
Business tag attached to the VPI/VCI or IP interface	The path can be found using a business tag, which is attached to the VPI/VCI or IP interface by entering its key. It can then be opened from the Find Business Tag window.	To IP Destination
Layer 2 MPLS Tunnel	Inventory window.	To IP Destination
LCP	Service view map.	•To IP Destination •Start Here

Cisco ANA PathTracer Endpoints

If you choose the Start Here option, Table 9-2 lists the endpoints that can be selected as a path destinations.

Table 9-2 Cisco ANA PathTracer Endpoints

Element	Location	End Options
IP Interface	•Inventory window •Affected entity (enabled only if the affected entity has an IP interface)	End Here
Site	Service view map	End Here
LCP	Service view map	End Here

The Cisco ANA PathTracer multipath window is displayed. From this window you can open the Cisco ANA PathTracer single-path window with the appropriate VPN information displayed in the Layer 2 and Layer 3 tabs.

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Note If multiple paths are selected in the paths pane, or if nothing is selected in the paths pane, then all the available paths are opened automatically, and each one are displayed in a separate Cisco ANA PathTracer single-path window.

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Cisco ANA PathTracer Windows

The Cisco ANA PathTracer multipath window (Figure 9-1) displays all the discovered paths between the selected source and destination for the selected context, including devices, links, and paths. The Cisco ANA PathTracer multipath window enables you to do the following:

•View a previous path or the next path.

•Open the Cisco ANA PathTracer single-path window to view a single selected path.

•Save the multipath map to a file.

•Run the Cisco ANA PathTracer again.

Figure 9-1 Cisco ANA PathTracer Multipath Window

1	Menu bar	2	Toolbar
3	Map path traced at... tabs	4	Map pane
5	Status bar	6	Paths pane

The Cisco ANA PathTracer single-path window (Figure 9-2) displays the discovered-path devices and links, as well as path layer properties. The Cisco ANA PathTracer single-path window enables you to:

•View a map of the intermediate network elements.

•View the following information for each network element:

–The relevant parameters for each interface on all layers along the path.

–For each layer, an indication of a mismatch between the parameters of the interfaces on both sides of a link.

–Traffic statistics along the path.

•Monitor the status and traffic of all the links along the path.

•View In and Out port properties.

In addition, right-clicking an item in Cisco ANA PathTracer enables you to view device properties and attach business tags.

Figure 9-2 Cisco ANA PathTracer Single-Path Window

1	Menu bar	2	Toolbar
3	Map pane	4	Status bar
5	Layer tabs	6	Properties table
7	Hide or display Properties table

The Cisco ANA PathTracer single-path window displays information regarding each device. The information is either plain data that was extracted from the device or calculated data such as rates or statistics. The information is displayed in the Layer 1, Layer 2, and Layer 3 tabs.

In addition, the Cisco ANA PathTracer tabs display information regarding VPNs. The information is displayed in the Layer 2 and Layer 3 tabs.

Using Cisco ANA PathTracer for Layer 3 VPN

Cisco ANA Path Tracer uses VRF routing and label switching information to trace the path from one VRF interface to another. If you choose a start and endpoint from the right-click menu, you can open the Cisco ANA PathTracer for Layer 3 VPNs. The Cisco ANA PathTracer multipath window shows the VPN topology map. From this window, you can open the Cisco ANA PathTracer single-path window with the appropriate VPN information displayed in the Layer 2 and Layer 3 tabs.

For Layer 3 path information, Cisco ANA uses VRF routing and label switching information to trace the path from one VRF interface to another. Layer 3 Cisco ANA PathTracer information is displayed in the Cisco ANA PathTracer window when the path goes over connections and ends in VRFs.

To view Layer 3 path information, choose the Layer 3 tab and choose Show All from the View menu. The path information is displayed in the active tab.

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Note Selecting a device or link on the map automatically highlights the related parameters in the table.

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The Cisco ANA PathTracer single-path window with the Layer 3 tab is displayed. The table displays the Layer 3 VPN information on the device that has a VRF. The following Layer 3 properties displayed in the Layer 3 tab relate specifically to VPNs:

•Name—The name of the site, for example, ATM4/0.100(10.0.0.1) is a combination of the interface name and IP address used to reach the site. Each site belongs to a particular VPN, so the address must be unique within the VPN.

•IP Address—The IP address of the interface.

•Mask—The mask of the specific network.

•State—The state of the interface (up or down).

•VRF Name—The name of the VRF.

•Sending Alarms—Whether the alarm for the required port has been enabled (true) or disabled (false).

Cisco ANA PathTracer does not display or trace EXP bits for L3 VPNs that policy-based tunnel selection (PBTS).

Using Cisco ANA PathTracer for Layer 2 VPN

Cisco ANA uses VC ID and label switching information to trace the path from one tunnel interface to another over the MPLS network.

The Cisco ANA PathTracer also covers end-to-end Layer 2 VPN service paths from one CE router to another. The path goes over circuits (for example, a VC) or VLANs in the access networks and LSP between the Layer 2 tunnel edge.

The Cisco ANA PathTracer multipath window shows the VPN topology map for the relevant devices and links. From this window, you can open the Cisco ANA PathTracer single-path window with the appropriate VPN information displayed in the Layer 2 and Layer 3 tabs.

For Layer 2 path information, Cisco ANA uses VC ID and label switching information to trace the path from one tunnel interface to another. Layer 2 Cisco ANA PathTracer information is displayed in the Cisco ANA PathTracer window when the path goes over pseudowire tunnels.

To view Layer 2 path information, choose the Layer 2 tab and choose Show All from the View menu. The path information is displayed in the active tab.

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Note Selecting a device or link on the map automatically highlights the related parameters in the table.

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Layer 2 properties that may be displayed in the Layer 2 tab relating specifically to VPNs include:

•Outer Label—The details of the outer MPLS label.

•Inner Label—The details of the inner MPLS label.

•MAC Address—The MAC address.

•Tunnel ID—The tunnel identifier. The identifier and the router IP addresses of the two tunnel edges identify the pseudowire tunnel.

•Tunnel Type—The tunnel type, 0=Unknown, 1= PWE3, and 2=TE.

•Tunnel Status—The operational state of the tunnel, either up or down.

•Tunnel Local VC Label—The MPLS label that is used by this router to identify or access the tunnel. It is inserted in the MPLS label stack by the local router.

•Tunnel Peer VC Label—The MPLS label that is used by this router to identify or access the tunnel. It is inserted in the MPLS label stack by the peer router.

•Tunnel Local Router IP—The IP address of this tunnel edge, which is used as the MPLS router ID.

•Tunnel Peer Router IP—The IP address of the peer tunnel edge, which is used as the MPLS router ID.

•Distribution Protocol Type—The protocol used by MPLS to build the tunnel, for example, LDP or TDP.

•Peer Oid—The tunnel ID and device name.

Using Cisco ANA PathTracer for MPLS TE Tunnels

Cisco ANA Path Tracer uses label switching information to trace the end-to-end path of a TE tunnel path from one PE router to another.

Using MPLS TE technology, Cisco ANA PathTracer enables you to:

•View a path or list of devices.

•View the following information for each network element:

–The relevant parameters for each interface on all layers along the path.

–The path for the defined MPLS TE-LSP across the network.

The Cisco ANA PathTracer multipath window is displayed showing the MPLS TE tunnel topology map. From this window, you can open the Cisco ANA PathTracer single-path window with the appropriate MPLS TE tunnel information displayed in the Layer 2 tab.

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Note Cisco ANA PathTracer does not display or trace EXP bits for L3 VPNs that use PBTS.

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Viewing MPLS TE Tunnel Information

Layer 2 and Layer 3 Cisco ANA PathTracer information is displayed in the Cisco ANA PathTracer windows when a path is traced over MPLS TE tunnels. To view Layer 2 path information, choose the Layer 2 tab and choose Show All from the View menu. The path information is displayed in the active tab.

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Note Selecting a device or link on the map automatically highlights the related parameters in the table.

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Layer 2 properties that may be displayed in the Layer 2 tab relating specifically to MPLS TE tunnels include:

•MPLS TE Properties—The MPLS TE data set in an MPLS interface, mainly bandwidth allocation levels and signaling protocol.

•Tunnel Oper Status—The operational state of the tunnel, either up or down. If the Tunnel Oper status is up, the Tunnel Admin Status must also be up (see the Tunnel Admin Status properties for additional information).

•Tunnel Bandwidth Kbps—Tunnel configured bandwidth in Kb/s.

•Tunnel Description—A textual description of the tunnel.

•Tunnel Name—The interface name.

•Tunnel Admin Status—The operational state of the tunnel, either up or down, however;

–If the Tunnel Oper status is up, the Tunnel Admin Status must also be up.

–If the Tunnel Admin status is down, the Tunnel Oper Status must also be down.

•Tunnel Lockdown—If enabled, the tunnel cannot be rerouted.

•Tunnel LSP ID—LSP identification number.

•Tunnel Auto Route—If enabled, destinations behind the tunnel are routed through the tunnel.

•Tunnel Hold Priority—The tunnel's priority after path setup, when other tunnels try to remove it and claim its resources.

•Tunnel Setup Priority—The tunnel's priority upon path setup.

•Tunnel Path Option—The tunnel's path can be either dynamic, in which case the tunnel is routed along the ordinary routing decisions after taking into account the constraints the tunnel imposes (attributes, priority, bandwidth) or explicit, in which case the route is explicitly plotted with included and excluded links.

•Tunnel Out Label—The TE tunnel's MPLS label distinguishing the LSP selection in the adjacent (next) device.

•Tunnel Affinity—The tunnel's preferential bits for specific links.

•Tunnel Destination Address—The IP address of the device in which the tunnel ends.

•Tunnel Peak Rate Kbps—Flow specification measured for this tunnel (in Kbps).

•Tunnel Out Interface—The interface through which the tunnel exits the device.

•Tunnel Burst Kbps—Tunnel burst rate (in Kb/s).

•Tunnel Average Rate Kbps—Tunnel average rate (in Kb/s).

•Tunnel Affinity Mask—Dictates which bits from the tunnel's affinity should be compared to the link's attribute bits.