Filter
Top Products
11-32
Cisco Prime Network 4.0 User Guide
OL-29343-01
Chapter 11 Using Cisco PathTracer to Diagnose Problems
Using Cisco PathTracer in MPLS Networks
Using Cisco PathTracer for Layer 3 VPNs
Cisco PathTracer uses VRF routing and label switching information to trace the path from one VRF
interface to another. If you choose a launch point and destination from the right-click menu, you can
open the Cisco PathTracer for Layer 3 VPNs. The Cisco PathTracer window shows the VPN topology
map. From this window, you can open the Cisco PathTracer details window with the appropriate VPN
information displayed in the Layer 2 and Layer 3 tabs.
For Layer 3 path information, Prime Network uses VRF routing and label switching information to trace
the path from one VRF interface to another. Layer 3 path trace information is displayed in the
Cisco PathTracer window when the path goes over connections and ends in VRFs.
If a VRF table includes more than one path toward a destination, Cisco PathTracer shows all paths.
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.
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.
Cisco PathTracer does not display or trace EXP bits for Layer 3 VPNs that use policy-based tunnel
selection (PBTS).
Using Cisco PathTracer for Layer 2 VPNs
Cisco PathTracer uses VC ID and label switching information to trace the path from one tunnel interface
to another over the MPLS network.
Cisco PathTracer also covers end-to-end Layer 2 VPN service paths from one CE router to another. The
path goes over circuits (such as a VC) or VLANs in access networks and over LSP between the Layer 2
tunnel edge.
The Cisco PathTracer window shows the VPN topology map for the relevant devices and links. From this
window, you can open the Cisco PathTracer details window with the appropriate VPN information
displayed in the Layer 2 and Layer 3 tabs.
For Layer 2 path information, Cisco PathTracer uses VC ID and label switching information to trace the
path from one tunnel interface to another. Layer 2 path trace information is displayed in the
Cisco PathTracer window when the path goes over pseudowire tunnels.
To view Layer 2 path information, choose the Layer 2 tab and then View > Show All. The path
information is displayed in the active tab.